2x100W TDA7498 Class-D Amplifier Board

Brand:| Model: AA-AB32189
Product Video
DIY audiophiles rejoice! This 2 x 100W Class-D amplifier board is perfect for two-channel critical listening.
  • 2 x 100W Class D amplifier
  • Small footprint for space limited applications
  • Perfect amplifier for dedicated stereo use
  • Built-in cooling fan and over-temp protection circuit
  • 14 to 39 VDC power supply required
Part # 
Weight: 0.87 lbs.  
List Price$39.99
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Your Price
Buy 4-up$33.10
Part # 320-303
Qty:  EA
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Product Details

2x100W TDA7498 Class-D Amplifier Board

This amplifier board features a state-of-the-art, dual channel Class-D TDA7498 IC, which delivers up to 100 watts per channel. The small 3.6" wide by 4.8" long footprint allows this amplifier board to be used in many applications were size constraints limit the use of conventional amplifiers. Just add a 14 to 39 VDC power supply, signal source, and speakers!

A low noise cooling fan is mounted atop the robust heatsink to maximize heat dissipation. Thermal, over/under voltage, and current protection circuits are also included to extend the longevity of the amplifier board. Four fixed gain settings are available to allow for volume control at the source, and stereo RCA line-level inputs are pre-attached. Mounting holes are provided as is a 2.5 mm x 5.5 mm power jack for quick connection. Screw-down phoenix-type terminals are included for quick speaker wire connection.

• Class-D amplifier topology featuring TDA7498 amplifier IC
• Heatsink with attached fan
• Pre-drilled mounting holes
• Over-temperature, over/under voltage, and over current protection circuits
• Phoenix-type speaker terminals
• Line-level RCA input

• Power output (w/ 36 VDC power supply): 100W x 2 (6 ohms, THD 10%), 80W x 2 (8 ohms, THD 10%), 78W x 2 (6 ohms, THD 1%)
• Frequency response: 22 to 22,000 Hz
• Minimum impedance: 4 ohms
• Recommended power supply: 14 to 39 VDC, 6A regulated
• Fixed gain settings: 25.6 dB, 31.6 dB, 35.1 dB, 37.6 dB
• Power input jack: 2.5 x 5.5 mm, center-positive
• Dimensions: 4.8" L x 3.6" W x 1.4" H

Product Specifications
  • Power Output (RMS Per Channel @ 8 ohms)80 Watts
  • Power (RMS/Channel 8 ohms)51 - 100 Watts
  • Special FeaturesBoard Only Module
  • Weight Range< 10 lbs.
2x100W TDA7498 Class-D Amplifier Board
  • BrandParts Express
  • ModelAA-AB32189
  • Part Number320-303
  • UPC844632096686
  • Product CategoryAmplifiers
  • Unit of MeasureEA
  • Product Rating
    (8 Reviews)
  • Weight0.87 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.

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2x100W TDA7498 Class-D Amplifier Board
2x100W TDA7498 Class-D Amplifier Board is rated 4.5 out of 5 by 8.
Rated 5 out of 5 by from This little amp rocks!I bought this for a project but changed when my wife wanted a speaker system in the living room. I was going to buy a sound bar system because you get speakers, wireless subwoofer, bluetooth and on some Wi-Fi. After researching sound bar's, I realized they are not very good for music. I had an old pair of tower speakers that were hardly used. I put them in the living room along with the TDA7498 amp, an Apple Airport Express. I connected these devices together and BAM! I was able to access and stream my iTunes library, Pandora or any other audio app on my iPhone. The sound of this amp was amazing! I am willing to challenge any sound bar around to see who is the champ, sound for sound. I then connected a Polk Audio DSW MicroPRO 8" sub and now my house shakes with hi-fidelity sound. The hi and meds are awesome, too!
Date published: 2013-10-28
Rated 5 out of 5 by from Great Product, there is a manual too.I agree with the over all positive points people have made on this site, I purchased the board from PE and just finished putting together a nice compact little amp for the shop. I notice several people comment about the lack of a manual, PE has the manuals online.. the manual for this item is here:http://www.parts-express.com/pedocs/manuals/320-303-parts-express-manual.pdf
Date published: 2013-08-05
Rated 3 out of 5 by from A little frustrated, but it should workI just finished installing this board, and it OK... but I sure wish it had more volume (like the one it replaced with similar specs).OK, so a little background: I built an amplifier cabinet using a SURE 11141-112v100 board (also a 2x100 watt) that I bought from Parts-Express, to run several sets of speakers in my workshop. I used impedance matching speaker volume controls (that I also bought at P-E too). The rig worked great for a few months and with a good 32V PSU, had more volume than I needed. A couple of weeks ago, I was driving the system with an ASUS netbook per usual, when I decided to hook up an external monitor to see ITUNES better. As soon as I plugged the VGA monitor into the netbook, I started getting a loud interference sound from the amplifier. I unplugged the monitor and it went away, plugged it back in and it came back... then the amp died. No way to explain this failure... the items were on different AC circuits... and the netbook is meant to drive a VGA monitor... but there it was, dead. As the whole project was built around the old board, I had no choice but look for another at P-E (it was out of warranty as it sat in the box for a long time before I built the project). Turns out, the old board was no longer available, and so I bought this new one. While the wattage is the same, the dimensions are not, which necessitated a shop fabricated adapter board to mount this in my cabinet. Once I got it all together, it worked OK, but the volume is significantly lower than the old board with similar specs. I am disappointed, but not enough to start over again. I just hope this Sure board is not as touchy as the last one.
Date published: 2014-03-18
Rated 5 out of 5 by from Cheap, loud, small, versatileI built a home sub box, and built a compartment in the bottom of the sub box for this amp and a power supply. I used to 2 computer ATX power supplies in series, giving me 24V at 15A. I have a two 6.5" kickers that are now loud as some 10" subs. I was impressed by the volume at low frequencies. An important point, if you hook an ipod or smartphone to this amp, it wont be very loud. From the sub out on a home receiver, which puts out a voltage signal 2-3 times larger, the amp plays at full volume. For volume control, I wired a pot between the amp and the input source which works really well. I would recommend this amp to anyone wanting a custom, cheap, and loud set up who is willing to put some time into setting it up. I used this to build a $300+ powered sub box for $66, which you can't beat!
Date published: 2013-10-23
Rated 4 out of 5 by from A very good but just a bit less than great amp board...I finally got one of these for testing. After about 8 hours of burn in, this amp board sounds very good, but does not have quite the transparency in the midrange of the Tripath designs. However, this is in fact a more powerful design at 8 Ohms than the TK2050 based amps from Dayton and Sure (now under the Parts Express brand). The design has clearly been corrected from the early versions that were marginally stable and had a frequency response tilted towards the treble when first reviewed. The amount of headroom on this board is much greater than that of the other designs I have tried in the Class D category, and will fill a large room with clean sound using a 20 VDC power supply into medium efficiency speakers. Since this board can be driven safely with up to 36 VDC, there is much more power to be had with a better power supply. Because of the max voltage rating of this particular board, it can be driven by a simple linear power supply using a 25-0-25 VAC transformer (readily available from Parts Express) full wave rectified (2 decent capacity diodes) into an arbitrarily large electrolytic capacitance (say about 10,000 uF rated at 50 VDC)--much simpler to build than the 30 VDC regulated supplies I have been building and testing with the Tripath boards.One caveat, since this board is not supplied with a manual: when setting up, be sure that the dip switches in the center front of the board are both ON, or you will get no sound from the board. (These are not the gain dip switches, which are on the right front (viewing the RCA jacks) of the board. I initially thought I had a bad board, until I examined the (extremely!) tiny print explaining the operation of the center dip switches.In summary, a great board for anyone who needs a LOT of power at low cost (and particularly if willing to build a linear supply to power it) at very good quality. This is a good board, but does not produce the astonishing clarity and 'you are there' feeling provided by some of the other class D boards on offer, as well as the Dayton, the Lepai, and (by reputation) the Topping amps. I think that most listeners would be perfectly happy with this board, and I must observe that my own ears are THOROUGHLY spoiled by half a lifetime of living with high end (not ridiculously expensive TOP end) equipment, not to mention the low cost but high end sounding equipment I've been experimenting with over the past 18 months. In terms of specs, I cannot explain the (to my own ears) difference in quality between the output of this board and the others I have tried, but afterA-B listening with a variety of program material, I am convinced this is real. But, to put this in perspective, the sound of this board is as good as what I have experienced from really good class AB amplifiers, so I can unreservedly recommend this board to all but the most picky end users. Oh, and at the current price, this board is an AMAZING value, though once again Parts Express has spoiled me silly.
Date published: 2013-08-05
Rated 5 out of 5 by from A great amplifier, and great service from parts expressI purchased this amplifier module for a portable speaker i built with drivers from parts express. I mounted it inside and power it with a small 75 watt power supply and use my iPod as the source. The sound is clear and strong, and it gets surprisingly loud, even with such a small power supply. It worked well for a few months, then just stopped. No problem because i received free replacement from parts express and it is working fine. Overall it is an incredible value, as since i already had the power supply, i got a solid 30-40 watt amplifier for $35. I marked down one point on features because the input sensitivity seems to be a little low for use with an iPod, as on quiet songs the amplifier did not quite reach its full potential. Cant wait to order a larger power supply to really get this amp going! Very satisfied with parts express and will order from them again for any other projects because i know that they back their products up.
Date published: 2013-08-06

Product Q&A

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who own this product or have experience with it.
If your question requires design or troubleshooting information,
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2x100W TDA7498 Class-D Amplifier Board

Is it possible to wire the amp like this for a 2.1 stereo system?

Asked by: Dewald
No. The suggestions of using a 2.1 amp or 4-channel DIY board with a DVC subwoofer are good ones. I've linked a few appropriate products below. Whatever way you decide to go, our DIY amp boards are not designed to be bridged or wired in the manner you depict.
Answered by: RussR
Date published: 2012-11-20

Will this work with 2 12V Sealed Lead Acid Batteries wired in a Series?

Asked by: sly197
The amp will work with the two lead acid batteries in series but it's rated output is with 36VDC input, so you would be looking at less then rated output with only 24V nominal input that the batteries supply.Bump it up to 3 lead acid batteries in series and problem solved. ;)
Answered by: mtg90
Date published: 2012-11-20

Is it possible to use this amp with 4 ohms on 1 ch & 8 ohms on the other?

Asked by: Aeon
Yes, however the results will vary on your doing this. If you are bi-amping and using one channel for the woofer, and the other for the tweeter - you will be fine. If you are running two full range speakers - one 4 ohms and the other 8 ohms, the power supply will be working harder to take care of the 4 ohm load and you might hear some anomolies between the two speakers. If in different rooms - probably not an issue. If you can provide more information - I can help you better.
Answered by: MarkAJH
Date published: 2012-09-13

Fan noise?

Have noticed an increased amount of fan noise on this board, to the point that I can hear it over low level of music coming from the system this powers. It's inside a wood cabinet with an open back. Any tips?
Asked by: Matt317
I would recommend checking for dust build up around the fan or heat sink cooling fins. As long as there is sufficient air flow around the fan the only other problem could possibly be fan bearings going bad.
Answered by: MattP
Date published: 2013-09-07

Is there anyway to attach a volume control knob and/or a power switch?

I'd like to use this for a custom stereo install but would definitely like to control the volume and have an on/off switch on the amp.
Asked by: JH1234
There is a volume control board for this amp with blinky lights and all. PE carries it (320-318).If you are looking for more features (ie tone control), and you have soldering skills. PE also carries a preamp kit with volume, and tone (320-176). Also be aware of the 12 VAC x2 power requirements.Then again you can build your own line level attenuator (volume control) with dual ganged 50kohm Audio Taper Potentiometer (023-650) and some resistors. Do a little web searching (diy volume control).Your fourth option is to skip the volume control all together. Just use the volume on your input device. For example I'm currently building an ipod boom box with the other 2x100W Sure Amp (320-334) and plan on using the ipod's volume for control.To turn the amp on/off, you just have to add a switch to your power supply. Go figure, PE sells those also.Best of luck on your project
Answered by: Doyne5
Date published: 2012-12-28

Can I use a 36V lithium battery with this amp?

Charge voltage of most 36V lithium batteries is 42V. Some electronics can handle slightly beyond stated maximums (this amp's user guide says 40V max) so it seems like it might be able to handle an extra 2V.I know I could just simply charge the lithium batteries up to 40V, but that means wasted capacity.Would it work with 42V or would that trip the over voltage protection?
Asked by: jonnyboy
This amp will probably shut down and refuse to work at 42 VDC power input. Max voltage is rated at 36VDC for this chip. You could probably build a 36 VDC linear regulator board for this purpose, but this requires serious expertise.
Answered by: Doc Jones
Date published: 2012-11-20


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