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Precision Power PPI P900.4

900W Phantom Series Class D Full Range 4-Channel Amplifier

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Precision Power PPI P900.4

900W Phantom Series Class D Full Range 4-Channel Amplifier

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Belva BAK44 4-Channel 4 Gauge Amplifier Installation Kit

Complete 4-Channel CCA 4 Gauge Amp Kit with RCA Cables and Speaker Wire

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Save 25% on a 4 Gauge Amp Kit with Purchase!

You will need an amp kit to install your amp, and the TruConnex TC4KIT-44B by Metra is the perfect kit for this amp. For a limited time, when you click "Add Both to Cart", you'll receive 25% off the amp kit. This offer cannot be combined with any other coupons or offers.

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TruConnex TC4KIT-44B by Metra

• 4 Gauge Power Amplifier Installation Kit
• Ideal for Systems Up to 900 Watts
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• 4-Channel Twisted RCA Cables

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Sonic Electronix Power Certified Amplifier

Precision Power's P900.4 4-Channel amplifier is a Sonic Electronix Certified Amplifier. This amp's power output has been professionally tested with our SMD Amplifier Dyno, bringing you it's true power ratings.

Impedance
Claimed Output
Certified Results
Dynamic Results
4 Ω
145W @ 14.4V
149W @ 14.11V
152W @ 14.13V
2 Ω
225W @ 14.4V
255W @ 14.01V
271W @ 14.14
4 Ω Br.
450W @ 14.4V
480W @ 14.11V
491W @ 14.14V



General Features:

  • Phantom Series Class D Full Range 4-Channel Car Amplifier
  • RMS Power Rating (14.4V):
    • 4 ohms: 145 watts x 4 chan.
    • 2 ohms: 225 watts x 4 chan.
    • Bridged, 4 ohms: 450 watts x 2 chan.
  • RMS Power Rating (12V):
    • 4 ohms: 100 watts x 4 chan.
    • 2 ohms: 150 watts x 4 chan.
    • Bridged, 4 ohms: 300 watts x 2 chan.
  • Sonic Electronix Certified Power Rating*:
    • 4 ohms: 149 watts x 4 chan.
    • 2 ohms: 255 watts x 4 chan.
    • Bridged, 4 ohms: 480 watts x 2 chan.
  • MOSFET power supply
  • LED power (green) and protect (red) indicators
  • On/Off circuit delay
  • 4/3/2 channel operation
  • 3-Way System Protection circuitry
  • Tri-mode capable
  • Band-pass crossovers
  • Input source selector
  • SMT Circuitry
  • Composite double sided epoxy PCB
  • Heavy duty aluminum alloy heatsink for extreme heat dissipation
  • Nickel-plated RCA level inputs
  • Nickel-plated screw terminals
  • Input sensitivity:
    • Low level: 200mV-6V
  • Variable high-pass filter (20-4000 Hz, 12 dB/octave)
  • Variable low-pass filter (50-5000 Hz, 12 dB/octave)
  • Damping factor: >114
  • Dimensions: 10-15/16"L x 6-3/4"W x 2"H
  • 4-gauge power and ground wiring is required for installation. Contact us for information regarding a discount on select amplifier kits when purchased together with this amplifier.
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

*The Sonic Electronix Certified Power Ratings listed are based on a test of a specific sample amplifier. Actual power ratings may slightly vary between amps.

Power Specifications - Full Range Channels

RMS Power @ 4 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 4 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

145 watts x 4 channels
RMS Power @ 2 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 2 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

225 watts x 4 channels
RMS Power @ 1 ohm

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 1 ohm, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

Not Stable
Bridged RMS Power

Bridging refers to combining two channels on an amplifier to create one channel with double the voltage and an increased power output. A 2-channel amplifier will bridge down to 1-channel and a 4-channel amplifier can bridge to create 2-channels. An amplifier is most commonly bridged to drive a subwoofer.

Remember, once you bridge two channels down to one its final impedance will be 4 ohms unless otherwise specified. This rating lists the RMS power created once an amplifier is bridged.

450 watts x 2 channels

Amplifier Specifications

Amplifier Series
This designates the series of the amplifier. Many amps are available in a litany of different wattage and channel configurations, but maintain consistent features throughout the product line.
Phantom (Precision Power)
Amplifier Class

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.

D
Number of Channels
Each channel on an amplifier will power one speaker using a positive and negative cable. There are various types of amplifiers, each designed to power a certain number of speakers. Monoblock amplifiers, also known as single channel, are designed to power one or more subwoofers. These amplifiers often have very high power ratings. On the other hand, multi-channel amplifiers power multiple speakers, usually at lower power ratings. 2-Channel and 4-Channel amplifiers can power car speakers or low powered subwoofers. Occasionally you might see a 5 or 6-channel amplifier that can power speakers and subwoofers at the same time. The most common setup is a monoblock amp to run subwoofers and a 4-channel amp to run door speakers. Check out our Knowledge Base for more information.
4
Total RMS Power Output
Total RMS power is measured by multiplying RMS power per channel by the number of channels, and is calculated at the lowest level of operating impedance.

RMS power is the amount of continuous power, measured in watts, that an amplifier produces is called RMS power. The higher the RMS figure, the louder and cleaner your music sounds.

The RMS output figure is much more accurate than the peak rating when comparing products.

900 watts
Maximum Input Gauge Size
This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
4 AWG
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
2 ohms
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
4 ohms
Speaker Level Inputs
Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
No
Preamp Outputs
Many amplifiers are equipped with RCA preamp outputs which pass the original music signal from the source to additional amplifiers. This is known as daisy chaining because the source connects to the first amp, and the first amp connects to the second amp, etc. The advantage to daisy chaining is you only need one 2-channel RCA cable to transfer the signal from the head-unit to the amplifier, and then one additional cable for each amp being daisy chained.
No
Built-in Crossover

A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

Low-pass (LP)
High-pass (HP)
Bass/Gain Remote
If the amp comes with a bass/gain remote you will be able to control the level of your bass from your dashboard. Typically bass remotes also include a 16-20 ft. wire for installation.
No
Fan Cooled
A great feature to have if an amp generates a large amount of heat. Cooling fans can help regulate the temperature to prevent the amp from overheating (burning).
Yes
CEA-2006 Compliant
Amplifiers that have been tested to meet specific standards. When a car amplifier meets these standards, you can be sure that it will be able to produce the amount of power specified by the official CEA-2006 rating. Usually, these rating consist of the following items:
  • RMS Power
  • Signal-to-Noise Ratio

This rating applies to both external car amplifiers, as well as the amplifiers inside of in-dash stereos.

No
Hi-Res Audio Compatible
This feature refers to if the product is capable of Hi-Res Audio (HRA) playback.

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
88%
4 Star
7%
3 Star
0%
2 Star
2%
1 Star
2%

Average Attribution Rating

Durability
4.5
Value
4.7
Features
4.6
Design
4.4
Usability
4.6
Jones

WI

Overall
Durability
Value
Features
Design
Usability
PPI P900.4 Big power little package

March 25, 2014

This amp is small and does a great job, it has plenty of power for most car systems and stays cool. I cant say anything bad about it. Have a good set of speakers because this amp has got big power!! I am running 2 set of Polk mm6501 off this amp and it sounds very good!!
For the price you cant go wrong, this is a deal..

51 of 60 found this helpful

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Jordan

Canada

Overall
Durability
Value
Features
Design
Usability
Simply can't be beat! A steal for the price.

January 23, 2015

If you want an inexpensive, powerful amp that is very well suited to SQ applications, look no further than this puppy. Gobs and gobs of really clean power, and stays cool even in tight spaces, and its so small! The built in crossovers are also a very nice feature, giving one the ability to go active without needing an expensive DSP.

It's cleaner sounding and puts out just as much power (and 150W more bridged, infact) as my dad's Alpine PDX-F6, all at a quarter of the price! I've had it for just over 6 months and have had no issues whatsoever with the amp. I have it running in 3 channel mode currently, hooked up to Morel Tempo 6 components for my front stage and bridged on the rear for my 15" JBL GTO sub in IB, with the source all coming from my DEH-80PRS. Godly sound. Planning on purchasing another Phantom amp soon, the P1000.1 (from Sonic of course, even being in Canada, they're still the cheapest around, not to mention the great customer service) for my sub and then going fully active with my front stage.

48 of 56 found this helpful

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JD

Loveland, OH

Overall
Durability
Value
Features
Design
Usability
Good things come in small packages

October 14, 2014

I got this amp to go active in my SQ install. Being a PPI fan for many years I had to try this one. I was not disappointed. It has plenty of power and is very clean sounding. I have this installed along with my older PPI's and it is right at home. In the SQ circle this amp is quickly growing in popularity.

44 of 52 found this helpful

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John

Brainerd, MN

Overall
Durability
Value
Features
Design
Usability
seems great to me!

January 1, 2015

using this amp at half the rated power and it sounds great. doesnt get hot. would love to hear the potential at the full 140 rms but my speakers only handle 70. reasonably small amp, and connections are all tight and clean. comes with a 0 gauge adaptor for some reason but i guess the more power the merrier. pretty dang cheap too! only had it for a month, but so far its money well spent.

43 of 51 found this helpful

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john

Marco Island, FL

Overall
Durability
Value
Features
Design
Usability
best amp for $$ period

April 21, 2014

Runs cool and has gobs of power. I have it running a pair of 8" fosgates and a pair of 6X9 Infinities in my Nautique. It flat out pounds. I would recommend this amp / speaker combo every time.

41 of 49 found this helpful

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naresh

miami fl

Overall
Durability
Value
Features
Design
Usability
disappointed

September 10, 2013

i was disappointed with this amp. it worked and performed as expected, but the design of the amp is flawed. as some reviews stated, two Phillips screws on the speaker/power/ground terminals are difficult to tighten with a screw driver and the Phillips heads are easy to get rounded and as a result you cannot get a good contact with the wires .(power/ground/speakers) i contacted precision power via email to see if i can purchase the terminal screws but i did not get a reply and its been about 3 weeks now. because of this i'm giving this product 1 star.

39 of 45 found this helpful

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Davinci

Australia

Overall
Durability
Value
Features
Design
Usability
Amazing Amp!

July 24, 2013

I had all the common worries that we all have when buying amps, Does it have ignition/alternator whine issues?, will it cut out up high or can it really handle high loads?. i upgraded to this amp from the Infinity Kappa 4 and considering they are both within the same rms range, this amp is so much better, brought this thing worrying it was not going to deliver, but once i installed it, boy did it deliver simply amazing amp! i have it powering infinity Kappa Perfects and the sound quality is unsurpassed, everyone loves my system! Would recommend this amp!

42 of 51 found this helpful

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Robert

Sanford, FL

Overall
Durability
Value
Features
Design
Usability
Clear and powerful in a small package.

November 18, 2012

I recently installed this amplifier and it certainly has more power than I need for my system. Very clear and loud. no distortion or interference. It has versatility in installation being 2ohm stable. The documentation could be much better. Use a small philips screwdriver and you will have no problems installing the speaker and power wires. Don't forget to buy the 8ga inline fuse, for install.

43 of 53 found this helpful

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david

lakewood, CO

Overall
Durability
Value
Features
Design
Usability
Excellent Amp

July 28, 2013

I purchased this to power two wetsounds Pro80 speakers on my wakeboard tower. I run it bridged & it delivers! Loud clear power. I ended up purchasing the p600.2 & p900.5 as well to run the rest of my system & proudly boast one of the loudest systems at the lake. Requires less power than conventional amps & they take up half the space. Very happy, I tell you buy this amp, mine came with free foam peanuts.

39 of 46 found this helpful

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FatStrawPDX

Portland, OR

Overall
Durability
Value
Features
Design
Usability
Powering 2 sets of components!

August 31, 2012

This is a great budget amplifier. I'm using it to power my Hybrid Audio Unity U61-2 6.5" 2-way in the front doors and my DLS MS6A components in the rear deck. What I love most about this amp is that it came with 0 gauge adapters for the power/ground cables.

This is also a class D amp but very nice compared to most Class A/B amps out there. It produces nice sound quality compared to my old amp and no noise issues.

39 of 46 found this helpful

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Jeezy

Idaho

Overall
Durability
Value
Features
Design
Usability
Great amp

January 7, 2015

This is a great amp for the price. Im running 2 infinty kappa 6.5s in the front and 2 8in power acoustik mids in the rear and ill just say, it pushes them perfectly and the tuning is pretty good

37 of 44 found this helpful

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Robert

Sanford, FL

Overall
Durability
Value
Features
Design
Usability
Great value, power and size

May 7, 2013

Great value, power and size. Almost too powerful, had to turn the gain way down.

38 of 46 found this helpful

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Dan

Wilmington, DE

Overall
Durability
Value
Features
Design
Usability
Best budget amp hands down

August 6, 2012

It's not flashy, and it wasn't made to be. It won't wow you with a bunch of unnecessary bells and whistles. What it will do is very quietly, cleanly, and efficiently deliver ample power to all 4 of your cabin speakers, to your front stage and a subwoofer, or to a set of 2 way components run active. Completely utilitarian in design, this little powerhouse completely owns it's price point in the market. If you've made it this far in the decision making process to read this, buy it. You won't regret it.

37 of 44 found this helpful

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Jeff

Va

Overall
Durability
Value
Features
Design
Usability
Great 4 channel amp

January 22, 2015

I purchased this amp for 2 front speakers and bridged to a sub. I didnt think it would give the power stated but it does and it does it great. Would recommend this amp.

36 of 43 found this helpful

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Toe Jam

Sticks,MD

Overall
Durability
Value
Features
Design
Usability
PPI of old

May 3, 2014

This amp is brings back memories of the 90's PPI stuff just a whole lot smaller. I have it powering an Alpine SPR-60C component set up front and 2 Rockford T1692 6x9's in the rear and holy crap this thing is amazing !! It packs a serious punch for it's size and is so worth the money. I just wish I picked up another one before they sold out !

39 of 49 found this helpful

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Carl

Oswego, NY

Overall
Durability
Value
Features
Design
Usability
Cheap made. Others better...

June 18, 2014

I was looking at small footprint amp to fit in my 2006 vette convertable.

This amp is a time consuming to get it dialed in, -screw's for power, ground, and speakers a pain to get too [no allen wrench there ], And also on mine, the RCA inputs were loose and wobble . So be carful hooking up to these.
So if this is what you want for size and power,, I would recomend something like, ??
Pioneer, GM-D8604. As made alot better and sweet sound.. It's about the same power, and size..and its CEA Compliant.

35 of 43 found this helpful

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Brent

Monument, CO

Overall
Durability
Value
Features
Design
Usability
Awesome!

May 8, 2013

Just replaced a 50W RMS 4-channel amp with the PPI to drive a PPI PC3.65C front stage and I'm blown away!!!! Mere words don't do justice to this setup.

34 of 41 found this helpful

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backtopoolschool

Houston, Tx

Overall
Durability
Value
Features
Design
Usability
Solid upgrade

May 21, 2012

I installed this in place of the factory amp in my Porche Boxster S, along with Polk Momo's in the door. Very nice improvement.

33 of 39 found this helpful

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Jeremy

newtown, CT

Overall
Durability
Value
Features
Design
Usability
Solid amp

October 7, 2013

I'm pretty happy with it so far .works well

33 of 40 found this helpful

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Tim

Corvallis, OR

Overall
Durability
Value
Features
Design
Usability
Great little amp

September 17, 2013

For anyone looking for a solid class D amp, this is it. I've been running Class-D's in my last couple installs, no issues, no "coloring" of the music, it all sounds clean.
Compared to my Kenwood XR-4S, it puts out a little more heat, but much less than any A/B I've owned.
The amp is solid, feels like a solid brick. My only gripe is the gain setting. No indexed shaft makes repeat ability difficult, it only has a simple X-cut that doesn't 100% line up with the end cap markings.
For the price it can't be beat.

34 of 42 found this helpful

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Ryan

Mobile, AL

Overall
Durability
Value
Features
Design
Usability
Great Little Amps!

June 18, 2012

I installed a PPI P900.4 and a PPI P1000.1 under the driver's seat in 1998 Toyota Tacoma. These little amps are amazing the power they produce in such a small package. There are 3 things that I can say bad about the PPI is:

1.) Why use Phillips head screws for setting the gains and crossover points?

2.) The Phillip screws for the power and speakers wire holders are partial blocked by the bars made into the ends of the amp. I had to use a very small headed flat head screw driver to tighten the screws without stripping them.

Even with my above complaints these amps are a definite best buy! Btw, SonicElectronix.com sent them at lightning speed! Within 2 days after my order, they were at my house!!!

33 of 40 found this helpful

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bay

Atlanta ga

Overall
Durability
Value
Features
Design
Usability
ppi p900.4

January 12, 2015

small amplifier but nice power I have ten speakers on this for my highs

32 of 39 found this helpful

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geoff

pomona ny

Overall
Durability
Value
Features
Design
Usability
awesome

March 10, 2012

This amp is a power house and its smaller than a paperback book. Pics do no justice on it's size. Very low noise floor and very efficient. Barely gets warm. I've had a lot of amps most mid level and a couple high end this amp was without a doubt one of the best amps I've had due to its price, size, power and performance. I've picked up another one because of it. Its not the prettiest but you don't look at amps for looks. Homerun on this one PPI.

31 of 37 found this helpful

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Ryan

Port Allen, LA

Overall
Durability
Value
Features
Design
Usability
Great little amp

December 29, 2013

I would recommend this amp to anyone who needs a lot of power, small current draw, and doesn't want to break the bank. I think for 99% of car stereo enthusiast, this amp is all you will ever need. Personally I can not hear a difference between this and other A/B amps that I've had before this. The extra power is nice to have and so is the lack of strain on my electrical system. The amp is small, easy to install, and easy to use. The screwdriver issue isn't a huge problem as long as you have a small one around. That is really the only knock against it.

34 of 44 found this helpful

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Bumpasauras

Big spring tx

Overall
Durability
Value
Features
Design
Usability
Ppi 900.4

August 17, 2013

Very happy with the amp. I plan on buying another . Very stable at 2 ohm. Amp performs as advertised.

33 of 42 found this helpful

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Oren

Champaign, IL

Overall
Durability
Value
Features
Design
Usability
Best 4 channel on the market

September 30, 2014

Like the title says, best 4 channel on the market, although this is my 2nd out of 4 that Ive owned that stopped working on me with no burns or any mfs fried on the bored. Good thing sonicelectronix warranties. Excellent crossovers, CLEAN power, never get hot, excellent size for applications for limited space. Just hope my next amp doesnt take a dump on me.

30 of 37 found this helpful

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Radik

Canada

Overall
Durability
Value
Features
Design
Usability
Precision Power P900.4

December 28, 2011

This amp was for a stealth project in my family sedan. No subs, just a strong front stage and subtle rear stage. This amp is amazing, lots of power. It's set 1/4 way full range and it's making my pioneer rev 6x9s shine. It has a great x-over and great small foot print. Fits perfectly under the front seats. Only gripes with this amp, is the RCA connects seem kinda fragile. Also accessing the power and speaker terminals are a pain, you need a small screwdriver to tighten and adjust them. Problem is you lose the torque ability and can't easily tighten. If you can overlook those drawbacks, this is the best 4 Channel amp on the market, at any price point.

29 of 35 found this helpful

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Michael

Western, MA

Overall
Durability
Value
Features
Design
Usability
Great little, versatile amp!

June 12, 2012

This is a great big amplifier in a tiny little package. Sounds great! Pushes my Front component speakers and bridged the rear to push my iDMAX 12! More than enough power for me. Fits very nicely under my passenger seat. Solid little amplifier. I'm very happy with my purchase.

31 of 40 found this helpful

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Dsmduck

Portland, OR

Overall
Durability
Value
Features
Design
Usability
Great Little Amp!

November 28, 2014

This PPI amp is a powerful amp in a small package. It's running a compound set up consisting of two Kicker SSMB 8"s + tweets on the front channel and two Soundstream 6x9s on the rear channel. It is half the size of my old Planet Audio HVT754 tube amp, but has a lot more power, and is just as clear. I don't know if you could find a better amp in this price range.

28 of 35 found this helpful

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nadcicle

Nashville, TN

Overall
Durability
Value
Features
Design
Usability
PPI P900.4 - Tiny amp, huge power

December 6, 2013

Ordered this amplifier after hearing about all the positive reviews of it putting out a clean powerful signal. I read into how it came with reducers to fit 0 awg wire for those of us that only run such. Upon opening the box I was greeted with such a small amp staring back at me that I almost dropped the box from laughing. I was thinking to myself of all the places I could mount this thing cause it was so small. Besides the size of it, this amp is also extremely appealing for those of us that like sleek and shiny black. Well, I started hooking this thing up to come back with only a single gripe and that is the location of all the screw heads. I felt like I was scratching the edge above the power/ground area trying to tighten down the reducer. After I finished wrapping my screwdriver in tape to prevent scratching my new amp I finished my install. Starting this thing up had a strong click from the switch and a bright blue "on" light. I started adjusting this thing and really started get more and more surprised that so much power can come out of such a tiny package. I really was blown away by how they managed to squeeze all of the knobs on the side for setting up for an active system. It really is all crammed on a single side. If I had to see another revision I would suggest top mounted controls more spaced apart, but alas after settings them up correctly it was strong clean power coming straight through my speakers. I was so surprised that I went ahead and ordered another almost immediately. I will be back to order 1 more and go ahead and get a 2 channel while i'm at it soon. I might even just order another 4 channel and bridge them instead to keep them all matching.

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Greg

Australia

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Durability
Value
Features
Design
Usability
Excellent Little Amp!

July 6, 2015

I purchased this amp to use in bridged mode in my boat. So far it has performed flawlessly producing loads of clean, crisp power! I highly recommend this amp for power hungry speaker setups. The only con is that the screw down terminals are positioned slightly underneath the end caps which make it hard to screw the terminals down. Overall excellent amp!

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poo

Toledo Ohio

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Value
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beautiful it is a great product

May 31, 2015

Service. Was great product. Was beautiful. I love it will buy more

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Davids64327

Kearney, Mo

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Durability
Value
Features
Design
Usability
Solid sound as load as you want

July 12, 2015

The first unit I received from Sonic Electronix had a bad channel - wouldn't come on until power level was turned up to about half. Within a couple weeks, the channel died completely. Before it did, I was hooked on the sound. Awesome frequency response and all kinds of headroom. This economical little amp just rocks. Sonic was great about taking the original unit back and sending me another. It was well worth installing the replacement to experience the musical nirvana that this thing delivers when paired with the low impedance Infinity KAPAs!

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Champ

Lawrence, KS

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Value
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Design
Usability
Big sound in a small package

August 24, 2015

A lot of power and a very small footprint makes this amp a great buy. The crossovers are very flexible make for an easy tune. The only con is the way the speaker wire terminals are a little tricky to tighten due to their placement under the top lip. I would buy it again in a heart beat.

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Trahan101

Taftville,ct

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Durability
Value
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Design
Usability
Love,Love,Love this Amp!

July 30, 2015

I was a little Leary about this amp since it is class D and I have never used PPI before. I think I might buy a few of these and store them away in case they stop making them! Front channels running Polk MM6501 at 2.7ohm so close to 200watts crossover at 80hz and the rear channels running 2 RE Audio 8" dual 4ohm subs so at about 225watts. It is loud and clean! I used to compete in SQ and this amp is probably one of the best I've heard especially at this price!

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David

Butler, IN

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Value
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Usability
PPI phantom 900.4

July 30, 2015

Real clean real power at a great price. Belts out the power without having to set your gains at near clipping

12 of 16 found this helpful

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John

Garland, TX

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Value
Features
Design
Usability
AWESOME

October 29, 2015

Nothing can beat this for the price....... amazing, will always buy PPI.

5 of 6 found this helpful

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Jakerrr

Lexington, SC

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Durability
Value
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Usability
From someone with experience, A+

October 12, 2015

Performs exactly as advertised, and better. Running some SB Acoustics drivers 2 way active and this amplifier is some of the best equipment for the job. To get something noticeably better at all you'll need to spend at least 2-3 times more. Everything about it is top notch, especially for anywhere near this insanely cheap price range. This will support just about any setup you can cook up, from SQ to SPL, advanced or novice. If you don't like the crossovers, which are pretty good anyway, just use your active capable head unit / dsp, which you should be doing regardless.

For the best amplification this amount of money can buy for any 3 way active setup, simply buy this along with a P600.2 for the other 2 channels. PPI isn't a perfect brand, but the Phantom class of amplifiers stands alone as being the best quality product line this company has ever conceived.

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Otterman

Blanchard, OK

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Durability
Value
Features
Design
Usability
Pretty impressive.....

October 5, 2015

I'm only a few days into running this amp, but I'm frankly amazed at how much clean power this little thing puts out. My last amp has been amazing and completely reliable, but produces exactly half the power of this PPI and is literally twice the size and weight. Based on the speakers it's driving, I'm pretty sure the PPI's stated power is actually underrated. The crossover abilities of this amp are tailor-made for someone who wants to run a fully-active system (which is why I bought 2 of them)!
If you're looking for a 4-channel amp, I don't know how you can get a better one for the money. Performance is terrific, so the only test left for me is reliability and longevity. With as much power as this thing has, I won't be pushing it very hard, so I expect it will last longer than my car. The lone criticism I'd mention is that the mounting holes require a screwdriver extension that's fairly thin or you'll scratch the finish while mounting it. The positive side of that is if you do it right, the mounting holes and screws are hidden from view. I had to dig pretty hard to find a fault with this amp! Lastly, Sonic Electronix service (and price) was terrific.

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Timothy

EXETER, NH

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Durability
Value
Features
Design
Usability
Powerful and Accurate

April 1, 2016

I am running 4 6X9 Kicker speakers in my Camry and this Amp is awsome. I think I have the outputs about halfway and it is still crazy loud. It is also very clear and is quiet as well.

0 of 0 found this helpful

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GONEDEAF

New Zealand

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Value
Features
Design
Usability
Best value for money!

March 9, 2016

Beast of an amp for the size! Im running 4x 6.5mm fulll range sp audio's of them! Plenty of power and nice and small to install in tight places.

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Claude

Canada

Verified Purchase
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Value
Features
Design
Usability
big power small package.!

January 28, 2016

this is a second PPI P900.4 for my system, with this one i will be able to run everything active, the amps ability to band-pass is what i loove about it. plus its a pretty powerful little thing.

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marklar

WA

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Value
Features
Design
Usability
small amp big sound

November 24, 2015

was in a car i got in a trade. amp was small and sure ran the speakers loud and hard. amps settings are easy to get to. the adapters it has are nice for when using bigger wire. over all its a very nice amp and ppi has been around for some time. as you can see many ppl like this amp its a true workhorse

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Browse 6 questions and 35 answers
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Why did you choose this?
Sonic Electronix Store
Because it has a cross over capable of running active on door speakers and does rated power.
Clay A on May 6, 2016
meets power requirements, low cost, good reviews.
Larry R on Sep 4, 2015
Bench tested by Sonic and well over the rated RMS. Unable to improve sound quality without spending an insane amount of money for car amplifier. If it lasts a couple of years, I'll get my money out of it.
John P on Apr 14, 2016
This unit has good reviews on well known car audio websites as a quality budget amplifier. Has great crossover features that allow you to run numerous speakers without passive crossovers.
Terry O on Sep 2, 2015
How do i bridge this amp? would i put front left or right positive to the opposite? for example, if i put the + in the front left, do i put the negative in the front right?
Carl S on Jan 20, 2015
Best Answer: Use the R+ and L- terminals for the speaker connections. The manual didn't say, but since there is no bridge mode switch you'd have to feed the same RCA signal to both the R and L RCA inputs using a splitter.
Reply · Report · Peter F on Jan 21, 2015
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How do I run a 4 ch amp and a 2 ch amp off of only 2 RCA outs from my head unit? I have a clarion m502 and want to run a PPI P900.4 for my 4 cabin speakers and a PPI P600.2 bridged for my subwoofer.
Longdrive on Aug 10, 2014
Precision Power P900.4
Precision Power P900.4
Clarion M502
Clarion M502
Precision Power P900.5
Precision Power P900.5
Precision Power P600.2
Precision Power P600.2
Best Answer: Hey Darin, first you need to get two 1-male to 2- female connectors(http://www.sonicelectronix.com/item_45066_NVX-XIN2F.html) and attach them to each of the rear RCA cables on the rear of your Clarion head unit. Next you will connect your P900.4 to the front channel like normal, and connect it to the rear like normal, only you will now have 2 extra RCA cables left that you will use to connect your 600.2 with. I hope this is clear enough to answer you question
Reply · Report · Brandon R on Aug 10, 2014
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Where should the push buttons that say 1x and 10x freq on crosovers be set and does it matter where the low pass and high pass filters are set when the switches are set to full ? or should they be opened all the way up ? Running active off Prs 80 and using this amp for highs and mids.
Rm W on Jan 11, 2015
Best Answer: For mids choose what frequencies you want the speakers to play. Use one of the front or rear channels. Example: set HPF to 1x around 80 to 120 Hz. and LPF to 10x around 800 Hz in bandpass mode.

For highs use the opposite front or rear channel. Example: set HPF to 10x around 800 Hz in HPF mode.

Choose the cutoff freq based on the frequency ranges of the speakers and where it sounds good.

I believe when the amp in in FULL mode, the HPF and LPF are bypassed so it doesn't matter where the low pass and high filters are set.

1x and 10x multiplies what ever freq you have set by 1 or by 10.
HPF = high pass only
BPF = high pass and low pass together
Full = all frequencies. No filters used.

I'm just a audio enthusiast not a profession and not sure the exact frequencies you should use.
Good Luck
Reply · Report · Ryan J on Jan 13, 2015
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I'm thinking of adding another set of coaxial speaker and a 12" sub. Would this amp work well? I assume I would use 2 channels for the coax so 100W RMS at 12v to each, Do I run the other two channels bridged to the Sub? Does that deliver only 200W RMS to my sub?
Longdrive on Aug 17, 2014
Best Answer: This amp will run four channels or two channels (stereo). It could run two subs, or two coax speakers, etc. It will NOT run a pair of normal speakers AND a single voice coil sub without having a dead channel and lost power. You could run a pair of speakers and a dual voice coil sub... All that said, I suggest you get the five channel version of this amp for your install, or better yet get the mono amp version of this for your sub and run another amp for your speakers. These are great amps and they run well and at relatively cool temps. The only issue I found is the poorly placed Phillips screw terminals. Be careful not to strip them!
Reply · Report · Eric G on Aug 18, 2014
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How many amps does this draw? What size fuse would I need for this amp, if the fuse was placed in a distribution block.
Larry R on Sep 1, 2015
Best Answer: Use this formula to determine current draw.
1 How many watts do you plan on using?
2 what is the efficiency of the amp? (P900.4 is 83% at 4 ohms and 75.8% 2 ohms)
3 What is the voltage going into the amp? (example car battery) 12v, 13.6v etc..

Watts / efficiency = X, then
X / Voltage = Current draw

900 watt amp at 83% efficiency needs (900/.83) 1084w from the charging system.
At 13.6v (1084w/13.6v) that's 79.7 Amps

That would be the volts playing a pure sine wave. Music would be about half that or less. Depends on the type of music. Make sure your wire can handle the currrent and use a fuse at or under that current draw.
My amp was very efficient with my 13.6 volts. No light dimming. Along with my car battery I had an additional small 600 watt kenetik battery.

Sorry so technical, hope this helps
Reply · Report · Ryan J on Oct 31, 2015
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Product Summary

Manufacturer

Model Number

P900.4

UPC

709483038196

Weight

6.50lbs

Internal SKU

p9004

Internal Product ID

38338

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Precision Power PPI P900.4

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