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Sony XM-4S

Slim Series 4-Channel Amplifier

Discontinued
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This item has been discontinued

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  • Slim Series 4-Channel Amplifier
  • RMS Power Output:
    • 4 ohms: 50 watts x 4 channels
    • 2 ohms: 60 watts x 4 channels
  • Frequency Response: 5 Hz - 100 kHz
  • Variable bass boost (0-10 dB at 40 Hz)
  • Harmonic Distortion:: 0.005%
  • Built in Protection Circuit
  • Built in LPF and HPF: 80 Hz
  • MOSFET outputs and power supply
  • Speaker-level inputs with high-level sensing turn-on
  • Preamp inputs and outputs
  • Dimensions: 8-7/8" L x 7-3/4" W x 1-3/4" H
  • 1-year SonicElectronix.com warranty

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.

50 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.

60 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

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.
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.

240 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.
8 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)
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.
90 dB
Bass Boost
The objective of the bass boost is to get more kick out of your subwoofer. It is a circuit that emphasizes the lower frequencies at a given point. The bass boost should always be set first before setting the gain. This feature is known for destroying subwoofers and is commonly used incorrectly, so be cautious.
0 - 10 dB
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.
40A x 1 
Strappable
Some amplifiers can be "strapped" together in order to increase the output of a single audio channel. These amplifiers feature RCA preamp outputs, allowing you to pass the signal directly from one amp to the other to ensure consistency.
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
Sonic Certified Amplifier
Sonic Certified amplifiers have been tested by the experts at Sonic Electronix to meet or exceed the wattage ratings provided by the manufacturer. If this is marked as Yes, then you can trust the wattage ratings. If marked as No, then we have tested the amplifier and it did not meet the advertised wattage ratings. If marked as Not Tested, then the Sonic Electronix experts have not yet been able to test the amp.

Specials with this Item

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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
67%
4 Star
33%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.6
Value
4.4
Features
4.8
Design
4.9
Usability
4.8
matthew

West Columbia, SC

Overall
Durability
Value
Features
Design
Usability
do not bridge in three

April 16, 2012

I got this amp to put behind the back seat of a supercab, It's a great amp but i don't recomend bridging it. I tried that, and in about 15 minutes it got too hot to touch, so I'm getting a second amp for my sub.

0 of 0 found this helpful

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Dylan

Colorado

Overall
Durability
Value
Features
Design
Usability
Best bang for your buck

November 28, 2011

I have a '97 TJ and space is seriously lacking. Add to that no security and the high risk of the elements. I needed something just to be able to hear my music and this little amp does the trick. It is insanely small. I was able to tuck this bad boy upside under the drivers side steering column and because it is fan cooled it has no problem staying cool. It is completely out of the elements and is impossible to see without shoving your head up into the dash.

I was a little worried about getting a Sony amp, nobody ever speaks good of Sony, but I have been extremely happy and no issues. I had heard reports of popping and noise with this amp, but I haven't had any of those problems. Just have to make sure you wire the amp up properly, solid ground and don't run wires with other power wires. For the price, power, and size you absolutely cannot beat this amp. I highly recommend this amp for anyone who has a Wrangler and is wanting to hear their music, tire roar, wind, engine, this delivers.

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Adz

Australia

Overall
Durability
Value
Features
Design
Usability
Nice little unit

October 16, 2011

Purchased this around 6 months ago and I am quite impressed. Sits nicely under the passenger seat of the jzx100 or Toyota Chaser. Provides good power to 6.5" door speakers. Not the loudest as it's not hugely powerful but certainly good bang for buck.

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Wayne

Corpus Christi, TX

Overall
Durability
Value
Features
Design
Usability
Awesome power

October 11, 2011

These amps are small in size but huge on sound! An excellent deal. I have a pair of these and a pair of the mono amplifiers and they scream! Looking forward to getting more for my next car!

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Steve

Canada

Overall
Durability
Value
Features
Design
Usability
Great Amp

December 5, 2010

I bought this amp specifically because it was the only amp I could find that would fit under my seat in a Ford Ranger pickup without any issue. I was very impressed with the power from this small amp. I'm driving front component speakers and one 10" low profile sub. My system sounds absolutely awesome. This is a small but powerful amp.

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Joshg

Madison, Wi

Overall
Durability
Value
Features
Design
Usability
I wish I bought two

September 15, 2010

I bought this to upgrade an Infinity amp and speaker system for a 2002 Jeep Grand Cherokee. The amp was the best I could find that would fit in the tight spot under the seat and did not cost hundreds more. It is a good clean amp and runs 4 Rockford Fosgate speakers very well. It hasn't overheated yet and the high level inputs made the whole upgrade possible without replacing the head unit. Very good value. For most people it will run 4 speakers louder than you would want to play them and clean. I just wish I bought two so I could replace the Infinity system in my Intrepid. Now, they're gone!

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Lee

Canada

Overall
Durability
Value
Features
Design
Usability
Great small foot print.

April 7, 2010

This is one of the cheapest in price name brand small foot print amps available on the market. And it delivers.

What’s great about it is that it makes full output at 4ohms yet it is still stable at 2ohms (it makes a bit more at 2ohms but it is negligible).

I hate buying a 4 channel amp and only using half it’s rated power. It’s small and looks great, you can remove the chrome shroud to make it slightly smaller and it improves the stealth factor. There is also a pair of blue lights that you can turn on and off.

Also these have speaker level inputs with auto sensing turn on for easy connection to OEM systems.

Only downside is the xover is not variable, it is on or off at the preselected value.

I have owned this model for a few years now in a location that gets hot and little ventilation, very reliable units. They will automatically lower output if it gets to hot. Smart amps.

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Geno

San Jose, CA

Overall
Durability
Value
Features
Design
Usability
Smallest with decent output and pricetag

November 22, 2009

You will not find an amp with this small footprint that gives you some decent power. At 50watt rms x 4 @ 4ohm load this thing does the job.

Of course, if you have the space to put a bigger amp, for the same price you can get an amp with better specs.

The only time you can appreciate this amp is if you do not have the space for a big amp. So if you see mediocore reviews, its probably because they don't see what sony was trying to do here.

It has nice blue LED accents when its on, so if its under the seat you get a nice glow.

Bridgeable rear channel to power a sub.

Again this thing shines when you see how small it is. It's just an inch thick! It can fit under most seats even power seats.

It can power a subwoofer ok, but I would get the matching XM-1S mono amp for 500watt RMS @ 2ohm load.

Speaking of 2ohm load, I have ran this XM-4S with the rear channels bridged powering 2ohm subwoofer! It got hot, but it did not cut out. It was stable and was used in prolong hours. It's not recommended, but it works for those wondering.

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Chris

Montclair, NJ

Overall
Durability
Value
Features
Design
Usability
These are one of Sony's best

June 8, 2009

These are such a departure from Sony's latest down market moves, speakers, amps, headunits, etc. This is a great product. Compact size, nicely built, full range class D with fan for the price of typical AB class amps.

Somehow Sony got something right. Wonder who designed and made it for them? Sound is clear, amps stays cool. Puts out 50 watts x 4 with ease. Amp stays cool, and the rear channels also be bridged for sub. Don't overlook this one if you need a quality space challenged amp!

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Accessory Tools and Products

Accessories added

NVX XKIT84 4-Channel 8-Gauge Wiring Kit

In case you didn't know, NVX has top notch wire and this kit has everything you need!

Your Price $69.99

Kicker PK8 8-Gauge Wiring Kit

Great wire for your awesome new amp! Don't forget the RCA's!

Your Price $21.95

NVX XBG3PK 1/0 Gauge OFC Big 3 Upgrade Kit

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

Your Price $59.99

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 $151.99

Belva BBG3KT CCA 1/0 Gauge Big Three Kit

Features everything needed to upgrade factory power and ground wire.

Your Price $39.99

StreetWires FB8

8 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

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

Kicker K-Series RCA Interconnect Cable

19 ft. of 4-Channel RCA cable with dual twisted-pair conductors, hyper-flex technology, and gold plated contacts for maximum signal transfer!

Your Price $29.95

StreetWires ZN7 RCA Interconnect Cable

16.4 ft. of 4-Channel RCA Cable with hyper twist construction, oxygen free copper, and precision machined tips.

Your Price $59.99

Kicker 4-Channel RCA Audio Interconnect Cable

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

Your Price $19.95

NVX XWS1650 Speaker Wire

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

Your Price $29.99

NVX XWS1625 16 AWG Speaker Wire

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

Your Price $13.99

Belva BBSW167 16 AWG Speaker Wire

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

Your Price $12.99

Scosche SPL Meter SPL1000F

Handheld boomSTICK measures your SPL range from 60 to 135 dB

Your Price $21.99

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Product Summary

Manufacturer

Model Number

XM-4S

UPC

027242699939

Weight

5.00lbs

Internal SKU

xm4s

Internal Product ID

8602

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: Sony XM-4S