Expert Service 1-877-289-7664 [Hours]

2nd Annual Warehouse Sale!

Alpine PDX-4.100

4-Channel Power Density Digital Amplifier (PDX4.100)

Discontinued
|

We apologize

This item has been discontinued

  • 4-Channel Power Density Digital Amplifier
  • RMS Power Rating:
    • 4 ohms: 100 watts x 4 chan.
    • 2 ohms: 100 watts x 4 chan.
    • 4 ohms bridged: 200 watts x 2 chan.
  • Class D amplifier design
  • Stackable installation design with front-panel controls
  • Quick-connect speaker connectors
  • HP/LP Crossover: 30 Hz - 400 Hz, 12dB/oct.
  • CEA-2006 Compliant
  • MOSFET power supply
  • Stackable installation design with front-panel controls
  • Continuously adjustable gain control
  • Top mounted blue LED power/status indicator
  • 4-Layer glass epoxy PC board
  • Dimensions: 7-9/16"L x 10-1/8"W x 2-7/16"H
  • 1-year SonicElectronix.com warranty

Alpine products are warranted solely by Sonic Electronix, Inc. under the same period and terms as the original Alpine warranty. Sonic Electronix is not an Authorized Alpine Dealer and Alpine requires all merchandise purchased by Sonic Electronix customers to be returned solely to Sonic Electronix. Alpine products are also covered by our Standard Return Policy for returns on exchanges or refunds within 30 days from the date of purchase.

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.

100 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.

100 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.

200 watts x 2 channels
Peak Power Output
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison.

Not Specified

Amplifier Specifications

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.

400 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
THD at Rated RMS Power
The amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change and a more accurate amp. THD below 0.10% is inaudible.
1%
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.
Yes
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)
High-Pass Crossover Frequency
The high-pass crossover frequency can be a fixed crossover point or a variable crossover range. A variable high-pass crossover allows you to select a specific crossover point which allows frequencies above the set crossover point to pass, while making frequencies below the set point gently or harshly roll-off, depending on the steepness of the slope.

The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

30 - 400 Hz
Low-Pass Crossover Frequency
The low-pass crossover frequency is typically used for subwoofers. It can be a fixed crossover point or a variable crossover range. A variable low-pass crossover allows you to select a specific crossover point which allows frequencies below the set crossover point to pass, while making frequencies above the set point gently or harshly roll-off, depending on the steepness of the slope.

The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

30 - 400 Hz
Signal-to-Noise Ratio
This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
76 dB
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).
No
Fuse Rating
The amperage and the number of fuse(s) an amp requires.
30A x 2 
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.

Yes

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
70%
4 Star
30%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.6
Value
4.5
Features
4.3
Design
4.6
Usability
4.4

Geroy

Frederick, MD

Overall
Durability
Value
Features
Design
Usability

Quality Amp

May 27, 2010

As title says, its a quality amp, with great looks! i have a concealed install on my FJ Cruiser, so looks do not matter so much, but i love how its made, the ease of install and option of being stack-able.

0 of 0 found this helpful

Help our customers find the most helpful reviews

T

Pinellas Park, Fl

Overall
Durability
Value
Features
Design
Usability

Great Amp

May 24, 2010

I bought this amp in December and its powering 4 infinity 692.9i 6x9s and 2 39.2cf 31/2s. Ive had it on full range and get incredible sound reproduction. Ive have had it on high pass as well with the recent addition of my alpine mrpm500 and ppi pcx 124 single 12" and the highs are incredible. I own a 06 charger and I mounted the pdx4.100 upside down in the rear deck 8" sub cut out and it looks perfectly at home there. Awesome amp, definitely worth the money. Even in the Florida heat, in a trunk it still powers everything great.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Ray

allentown, pa

Overall
Durability
Value
Features
Design
Usability

great amp

April 20, 2010

I search around for months, talked to dozens of people, and looked hundreds of amps...and this is the 2nd best amp I've found, the only amp that takes this amp down is the MTX Thunder Elite 1004, and the 604 elite is the equiv of this amp. this amp, i got it last week, hooked it up a few days ago, even though i was still waiting for some more parts, new speakers primarily, but i hooked it up anyhow and tweaked around with it to see what it could do on my old speakers and with in the first day..it completely blew my rare speakers :-s the rating on this amp is amazing, 150 is the nominal RMS, i had it only about 60% on the gains when the old speakers blew, and only about 50% on the head unit. the sheet that came with them, stated 180 watts RMS at 4 ohm, was tested stable back when it was packaged. mine was packaged almost 2 years ago, but none the less, damn good amp. keep in mind that the possible peaks per channel can reach as high as 216 watts. At 60 amps at 14.4 volts. You'll be hard pressed to find a better amp, and the 2 ohm 4 ohm ratings are amazing, the ONLY amp on the market that even offers that, and in such a small footprint. I took off some because I felt there could of been more tweaking on the knobs that could have been added, granted the head unit will do most of that in my set up, but a 3-band equalizer will really not do this justice. the lay out of the inputs is designed not for just speakers but for any set up, so keep in mind your wired and what they are when you install them, they are marked as channels, not rear front, left and right as normal 4 channels are.. I managed to mix up all my channels and have a hell of a time figuring them out :P

0 of 0 found this helpful

Help our customers find the most helpful reviews

Tooque

Richardson, TX

Overall
Durability
Value
Features
Design
Usability

Great Amp!

February 14, 2010

Good, clean sounding, amp. Recommend.

0 of 0 found this helpful

Help our customers find the most helpful reviews

C-Willy

Las Vegas,NV

Overall
Durability
Value
Features
Design
Usability

Best amp you can buy for your highs and mids

December 16, 2009

I have this amp running 2 type S 6.5's in the front and 2 type r 6.5's in the rear doors and they sound crystal clear... The main reason to buy this amp is because it's class d which means it's more efficient and gives your vehicle's electrical system less strain while supplying more power to your speakers. No brainer purchase.

0 of 0 found this helpful

Help our customers find the most helpful reviews

john

Victoria, TX

Overall
Durability
Value
Features
Design
Usability

Nice amp

September 4, 2009

I have had this amp for a while now. Originally I had some issues with it shutting down into a protection mode. I never really figured out what was causing this. I asked around, had others look at it, no one could figure it out for sure. After messing around with it enough I found that adjusting the gain so my max playing volume was at a lower volume setting on my head unit seemed to fix the issue entirely. I do not think the amp was faulty and am certain it was not an overheating issue. I have used many different amps in the same configuration and have only had this issue with both of the Alpine amps I have used. Aside from that issue it has been a nice amp. The small size is great, and the stacking would be great for tight space installs. I really like the polarized quick connects for the speaker outputs as well.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Simo

Finland

Overall
Durability
Value
Features
Design
Usability

Small size big power

April 13, 2009

Nice little power package. Working great.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Trae

Foley, AL

Overall
Durability
Value
Features
Design
Usability

Really impressed!

January 10, 2009

I had this amp (still do just not hooked up) in an 85 prelude on a set of 6.5 type-r coaxials and a set of 5.25 type-r components, and it performed awesomely! Rated at 150 rms @ 4ohms per channel, I believe you cannott get a better amp! Though it doesn't have any preouts, you don't really need any because most subwoofer amps have them and that's what it should be connected to! Love the stackability and self-polarizing quick connects! Only hang up is the adjustments are not readily accessible because of the cover plate.... but you should only have to set your amp once!

0 of 0 found this helpful

Help our customers find the most helpful reviews

Jeffrey

Gulfport, MS

Overall
Durability
Value
Features
Design
Usability

Great Amp, Nice compact design

July 10, 2008

This Amp not only looks good and is discreetly compact, but it produces some awesome results. I hooked this up to some Alpine components it it sounds amazing. I definitely recommend this amp to anyone looking for something to push 2 sets of Alpine SPX-REF components, since that is what I have. The only down side IF I had to pick one would be accessing the gains. There is a door that you have to remove in order to get to them, and you have to use the right size Allen wrench in order to remove the door.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Kaushal

Des Plaines, IL

Overall
Durability
Value
Features
Design
Usability

Nice amp tiny, great sound low on features

July 17, 2007

Nice amp, good sound quality, but no pre-output, and lacks features found on similar priced amps. Also cheap plastic on sides, and caps are also plastic.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Accessory Tools and Products

Accessories added

NVX XKIT44 4-Gauge 4-Channel Wiring Kit

4-Channel 100% OFC Complete True 4 Gauge Amp Kit with RCA Cables and Speaker Wire

Your Price $99.99

T-Spec V12-4DAK 4-Channel 4-Gauge Wiring Kit

Get everything you need to hook up your new amplifier!

Your Price $119.95

NVX XBG3PK 1/0 Gauge OFC Big 3 Upgrade Kit

Comes with everything you need to upgrade your power and ground wire.

Your Price $79.99

Kicker Big 3 Package 1/0 Gauge Big 3 Upgrade Kit

Get all you need including wire cutters to upgrade your power and ground wire.

Your Price $149.99

Belva BBG3KT CCA 1/0 Gauge Big Three Kit

Features everything needed to upgrade factory power and ground wire.

Your Price $39.99

Universal Remote Level Bass Control

Controls bass level and frequency via RCA/Interconnect connectors on any amp.

Your Price $7.99

Small Universal Remote Level Bass Control

The Scosche RLC is a smaller universal bass remote that connects via RCA inputs.

Your Price $11.99

StreetWires FB4

4 AWG / 4 Gauge Firewall Bushing

Your Price $6.95

NVX XDBU4 - Top of the Line!

Distribution Block with Two 1/0 or 4 AWG Inputs and Four 4 or 8 AWG Outputs

Your Price $17.99

Professional Installation for your Car Power Amplifier

Covers labor charges through our professional installer network.

Your Price $89.99

NVX XIV45 4-Channel RCA Audio Interconnect Cable

5 Meters (16.4 ft.) 4-Channel RCA Audio Interconnect Cable with Dual Twisted Pair Hyper-Flex Technology

Your Price $23.99

StreetWires ZN9 Series Interconnect Cable

16.4 ft. of 4-Channel RCA Cable with Rhodium-plated contacts and ZeroNoise construction for clear signal transfer!

Your Price $99.95

Kicker 4-Channel RCA Audio Interconnect Cable

4 Meters (13 ft.) 4-Channel K-Series RCA Audio Interconnect Cable

Your Price $19.95

NVX XWS1225 12 AWG Speaker Wire

25 ft. of True 12 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

Your Price $39.99

NVX XWS1625 16 AWG Speaker Wire

25 ft. of True 16 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

Your Price $13.99

Belva BBSW127 12 AWG Speaker Wire

12 Gauge 7 Meter (23 Ft) Speaker Wire (CCA)

Your Price $14.99

Belva BBSW167 16 AWG Speaker Wire

16 Gauge 7 Meter (23 Ft) Speaker Wire (CCA)

Your Price $12.99

The Install Bay IB-CAP1F

True 1.0 Farad Car Audio Capacitor for up to 1000W Max

Your Price $37.99

e2 ECAP1 by Scosche - Mid-Level 1 Farad

Digital 1.0 Farad Car Audio Capacitor for up to 1000W Max

Your Price $49.99

Rockford Fosgate RFC1D - Top of the Line 1 Farad

Digital 1.0 Farad Car Audio Capacitor for up to 1000W Max

Your Price $104.99

Scosche SPL Meter SPL1000F

Handheld boomSTICK measures your SPL range from 60 to 135 dB

Your Price $21.99

AutoSound 2000 CD-102

High Frequency Test CD specifically designed for the set-up and evaluation of sound system imaging and placement.

Your Price $11.99

AutoSound 2000 CD-104

Audiophile reference series test disc for evaluation of all audio components.

Your Price $11.99

XIX2025 Strapping RCA

0.25 Meter (0.86 ft) Hyper-Flex RCA cable w/ Serpentine-Cut Nickel Plated Connectors

Your Price $12.99

Product Summary

Manufacturer

Model Number

PDX-4.100

UPC

793276300881

Weight

10.00lbs

Internal SKU

pdx4100

Internal Product ID

9219

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: Alpine PDX-4.100