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Precision Power PPI P900.4

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

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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.


Second Depth
The second depth is used only when the box is slanted or angled. This value is the top measurement and it is measured in inches.
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.
The height of the item, measured from top to bottom, in inches.
The width of the item from left to right (side-to-side) measured in inches.
Color of handle.

Warranty and Return Policy

Parts Warranty Duration
90 days
Labor Warranty Duration
90 days
Warranty Provider

Summary of Customer Ratings & Reviews

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Browse 10 questions and 38 answers
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Why did you choose this?
Sonic Electronix Store
Easy shopping and great prices!
Matt B on Nov 24, 2016
Because it has a cross over capable of running active on door speakers and does rated power.
Clay A on May 6, 2016
Goes great with the Polk Audio MM651UM's I ordered for my boat.
Alexander M on Jun 13, 2016
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
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
Crunch P900.4
Crunch 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( 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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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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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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I plan on putting a LC2i before this amp from my factory radio. I assume I will need y splitters RCAs between the LC2i and the amp.I realize I lose fader control but is this the correct way to do this or should I have ordered a LC6i? I just plan on running 4 door speakers(front and rear).
A shopper on Jul 18, 2016
Best Answer: Hello,

Splitting the signal will also split the quality of the signal. This defeats the purpose of the LC2i's main benefit. However, the amplifier itself has the ability to split the signal for you, with far less loss than physically splitting it with an RCA.

The ST / 4ch switch is intended for install like your own, where you only have one set of RCAs to provide.
Reply · Report · Rick MStaff on Jul 18, 2016
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how would i wire 2-DCS1654 6 1/2" Classic Subwoofers svc-4 Ohm in the bottom of doors and PHD 5 1/4 - 4 ohm plus 4 ohm tweeter in uper doors i have PPI-900.4 Amplifier and PPI-1000.1 Amplifier for 2-LS1044 10" Low Profile Subwoofer Dual 4 Ohm
in 96 dodge ram what would be the best way to setup?
charles m on Sep 30, 2016
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Does this amp have balanced differential inputs?
Tom R on Jun 17, 2016
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Does this amp have balanced differential inputs?
A shopper on Jun 17, 2016
· Add Answer · I Have This Question Too (0)

Product Summary


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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