Parts Express Free Shipping at 98 Dollars


2x2W at 4 Ohm Class-D Audio Amplifier Board

Brand:| Model: AA-AB32131
This high-quality dual channel Class-D audio amplifier board is capable of delivering 2W per channel of output power into a 4 ohm load.
  • Pre-assembled, pre-tested
  • Small size but big sound quality
  • Perfect Class-D architecture
  • Fully-bridged stereo output
  • Two channels—each up to 2W
  • Up to 88% efficiency
  • Does not require a heat sink for most applications
Part # 
Weight: 0.45 lbs.  
List Price$24.95
You Save43%
Your Price
Buy 4-up$12.00
Part # 320-306
Qty:  EA
Available Payment Methods

Product Details

2x2W at 4 Ohm Class-D Audio Amplifier Board

This high-quality dual channel Class-D audio amplifier board is capable of delivering 2W per channel of output power into a 4 ohm load. A PAM's PAM8803 IC offers ultra-low total harmonic distortion and noise, allowing it to deliver outstanding sound reproduction. Especially suitable for small speakers with an impedance of 4 or 8 ohms. This board can be powered by an external DC supply (4.5V to 12V) via a power port, 2.5V to 4.0V DC via a terminal block, or 2 to 3 AA batteries. Audio signal is input by a 2510 connector or 3.5 mm headphone jack, and volume control is adjustable by on-board buttons.

Specifications: • Output power (x 2 channels): 0.5W x 2 @ 8 ohms (<0.19% THD+N), 1.5W x 2 @ 8 ohms (<10% THD+N), 1W x 2 @ 4 ohms (<0.17% THD+N), 2.6W x 2 @ 4 ohms (<10.0% THD+N) • Frequency response: 20 Hz to 20 kHz (±3 dB) • Signal to noise ratio: 85 dB (22 Hz to 22 kHz, THD = 1% • Power supply range: 2.5V to 12V • Dimensions (mm): 74.4 L x 54.8 W x 18 H.

Product Specifications
  • Power Output (RMS Per Channel @ 8 ohms)0.5 Watts
  • Power (RMS/Channel 8 ohms)0 - 25 Watts
  • Special FeaturesBoard Only Module
  • Weight Range< 10 lbs.
2x2W at 4 Ohm Class-D Audio Amplifier Board
  • BrandParts Express
  • ModelAA-AB32131
  • Part Number320-306
  • UPC844632088117
  • Product CategoryAmplifiers
  • Unit of MeasureEA
  • Product Rating
    (3 Reviews)
  • Weight0.45 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

Similar Products

View similar products to the 2x2W at 4 Ohm Class-D Audio Amplifier Board
in the Amplifiers product category.


2x2W at 4 Ohm Class-D Audio Amplifier Board
2x2W at 4 Ohm Class-D Audio Amplifier Board is rated 4.6667 out of 5 by 3.
Rated 5 out of 5 by from Great AmpThis is a great little amp. I am a gaming console modder and finding an amp like this is like finding gold. Check out the video of the Console mod I did using this amp.I will be using this amp in other projects both big and small.On a side note DOWNLOAD THE MANUAL!!!. I fried 3 of these boards because I didn’t know that the plug in header for power is good for 12 v but the terminal block is only good for 4 volts.
Date published: 2013-11-07
Rated 4 out of 5 by from Pretty Nice...This little bugger is going to be useful for a small set of 2" full-rangers I am building (computer speakers for desk at work). Quality is nothing special and I don't think it sounds as good as its big brothers or the SI T-amp but it's nice that it takes less batteries than the SI. I am powering it with 3 C batteries (chose the Cs as a good compromise between capacity and size). Also, the ability to run it on many different PSU voltages gives it some flexibility. The built-in volume control also gives some flexibility as you can use it or set it to bypass for a fixed 4db gain.Just for fun, I tried this little guy as a headphone amp at the suggestion of the previous reviewer. I am sorry to report that there is far too much noise to use this as a headphone amp--at least with a pair of Koss Pro3AA (which are a modest 60 ohms).
Date published: 2012-09-06
Rated 5 out of 5 by from headphone amp or preamp worthyuse this as a pre amp in line with a resistor for the larger amps for an amp project with volume controll. desolder the buttons and add a three way momantary rocker switch for a more durable volume controll. or just put it in a project box with 2 AA battery box and make a killer phone amp.
Date published: 2013-06-20

Product Q&A

Get your questions answered from other customers
who own this product or have experience with it.
If your question requires design or troubleshooting information,
please email  for a prompt reply.
2x2W at 4 Ohm Class-D Audio Amplifier Board

How could I turn this into a headphone amp?

What basic parts would I need to turn this into a headphone amp? Also, would I need to convert the output ohms into something more suitable for headphone usage? Thanks!
Asked by: nebulax
I wasn't able to find a primary source for this, but I think you simply put a 120 ohm resistor in series with the headphone jack on the signal side. That should do it. =)
Answered by: AlonzoTG
Date published: 2011-12-10

Voltage gain?

My portable mp3 player has a few hundred mV headphone out. Can I use this unit to raise it to a few volts and input that to an amplifier?
Asked by: palmgrower
According to the manual, when the K1 switch is set to OFF, there are on-board volume control buttons that can vary the gain from −75dB to +23.8dB, in 64 discrete steps. This corresponds to voltage gains ranging from 0.1mV/V to 15.5V/V, so by setting the volume control to the correct setting, this amp would surely be able to provide you with the voltage gain you need.However, this probably wouldn’t be the best method of doing this. For one thing, most amplifiers should be able to output their full power when the input source (your MP3 player) outputs a few hundred mV. So in your case, I don’t see why you’d need a preamp before your amp. Of course some amps have a fairly high sensitivity, so I’m guessing this is the case for you, and the reason why you want this voltage gain.Also, another issue with using this Sure amp in the way you want to (which is pretty much like a preamp) is that although it produces very little distortion at low levels, distortion levels skyrocket at higher levels. For example, when outputting very low levels, such as 0.1W, its distortion will be somewhere around 0.05%, which is totally negligible (I don’t know the exact distortion level at this power output because it’s not listed, but that is a typical distortion level for a class D amp at that output level). When outputting 0.5W into 8 ohms, it produces 0.19% distortion, which is a fairly acceptable level, although not exactly great. This corresponds to an output voltage of 2V. However, when the output level increases to 1.5W into 8 ohms, distortion increases to an incredibly high level of 10%. This corresponds to an output voltage of 3.46V.The distortion level of a class D amp depends solely on the output *voltage* level (and not on the output *power*). So, when this Sure amp is outputting the 3.46V signal, it will have 10% distortion no matter what load it has, whether it’s an 8ohm speaker load, or it’s the input of your amp (which would be something like a 50kohm load). In the case of the 8 ohm load, it will be outputting 1.5W, whereas in the case of your amplifier being the load, it will be outputting an extremely low power level (due to the amp’s high input impedance). BUT, in both cases distortion will be 10%, solely due to the fact that in both cases the Sure amp is outputting a signal of 3.46V.Also note that the maximum output level of this Sure amp will depend on its power supply voltage. You will only be able to get the max 3.46V output (corresponding to 1.5Wx2 in 8ohm loads) when using a 12V supply. The lower the supply voltage, the lower the maximum output level.So, although this amp will be able to provide a voltage gain for your MP3 player, its output will start distorting quite a bit at an output level of 2V (as we saw), and will have incredibly high distortion at its max output of 3.46V. So, as I said above, this setup will work, but it wouldn’t be the best method due to the high distortion levels at the voltages you want.A better method (although, one that would probably cost more) would be to buy a dedicated preamp that is made for this type of application. Most preamps can provide fairly considerable voltage gain and can produce outputs of several volts, and can do so with distortion levels often around 0.001%, even at full output.
Answered by: eboyer
Date published: 2011-12-25

Could this amplifier be bridged?

Asked by: Weston
No. These cheap 1-chip amps have discrete outputs with floating ground. You could try without damage to the assenbly, but you may just get a loud oscillation [buzz].
Answered by: Fanden
Date published: 2012-02-07


Asked by: donnyb
One they recommend 2-3 AA batteries that's 3-4.5 volts. Any amplifier that uses a DC input can run on batteries, even the 600 watt amps, the type and amount of batteries determine how loud it gets and how long it plays, for a portable mp3 speaker I would recommend a small 12 volt SLA.
Answered by: William67
Date published: 2013-02-20

USB powered ??

Hello, to make a portable powered computer speaker, can I power this amplifier from the USB port of a laptop instead of using the power supply unit ? If so, is there an available USB cable with DC jacks to fit on this board on one end and USB jack on the other ?Thank you very much for answering !!
Asked by: soundaatma
Yes, it technically can be usb powered. I would recommend checking to see which usb port on the computer supports high power as some ports supply lower amperage than others. There are no "custom" USB cables and I would recommend googling USB Pinouts and testing with a multimeter to verify you are making the correct connections from the pins to the corresponding wires on the cut cable.
Answered by: Nemisius
Date published: 2012-07-17

Adding Volume Knob Control

Is there a way to add a volume knob control to this other than having just the onboard volume buttons? If so how and what do you recommend?
Asked by: Jake Mize
It's wierd that this beastie has those buttons on it, neverthelesss, the standard solution for amplifier modules is to use an appropriate volume pot. It is important to match the pot's impedance with the input impedance of your device. The closest value is 50k, so that's what I'm going to suggest... But then this is a weird board... I don't really have time to dig deeply into the manual right now...
Answered by: AlonzoTG
Date published: 2013-06-20

Customer Projects

Customer projects that include: 2x2W at 4 Ohm Class-D Audio Amplifier Board

If you built a project using this product, post it in the Parts Express Project Gallery.

Customer Discussions

Discussions in our TechTalk Forum that include: 2x2W at 4 Ohm Class-D Audio Amplifier Board

If you would like to start a discussion about this product, post a thread in the TechTalk Customer Forum.

Recently Viewed Products

Get Deals
emailed to you every week.

Be the first to hear about new and exciting products,special pricing and incredible deals!

See This Week's "GET DEALS" Email
Parts Express
725 Pleasant Valley Dr.Springboro,OH45066USA

© 1996-2014 Parts Express, All Rights Reserved