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4x100W TDA7498 Class-D Amplifier Board

Brand:| Model: AA-AB33184
Product Video
Two TDA7498 Class-D amplifier ICs are used on this amplifier board to produce up to 100W into four channels.
  • 4 x 100W Class-D amplifier
  • Small footprint for space limited applications
  • Perfect amplifier for bi-amp applications
  • Built-in cooling fan and over-temp protection circuit
  • 14 to 39 VDC power supply required
Part # 
Weight: 1.35 lbs.  
List Price$59.99
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Your Price
Buy 4-up$47.33
Part # 320-305
Qty:  EA
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Product Details

4x100W TDA7498 Class-D Amplifier Board

This amplifier board features two state-of-the-art, two-channel Class-D TDA7498 ICs, which deliver 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. Additionally, separate inputs and outputs make this amplifier board perfect for bi-amplifier use. 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 dual stereo RCA line-level inputs are pre-attached. Mounting holes are provided as is a 2.1 mm x 5.5 mm power jack for quick connection. Screw-down phoenix-type terminals are included for quick speaker wire connection.

• Two Class-D TDA7498 amplifier ICs
• Heatsink with attached fan
• Pre-drilled mounting holes
• Over-temperature, over/under voltage, and over current protection circuits
• Phoenix-type speaker terminals
• Four line-level RCA inputs

• Power output (w/ 36 VDC power supply): 100W x 4 (6 ohms, THD 10%), 80W x 4 (8 ohms, THD 10%), 78W x 4 (6 ohms, THD 1%)
• Frequency response: 22 to 22,000 Hz
• Minimum impedance: 4 ohms
• Recommended power supply: 14 to 39 VDC, 12A 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: 6" L x 4.5" 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.
4x100W TDA7498 Class-D Amplifier Board
  • BrandParts Express
  • ModelAA-AB33184
  • Part Number320-305
  • UPC844632096693
  • Product CategoryAmplifiers
  • Unit of MeasureEA
  • Product Rating
    (4 Reviews)
  • Weight1.35 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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4x100W TDA7498 Class-D Amplifier Board
4x100W TDA7498 Class-D Amplifier Board is rated 3.5 out of 5 by 4.
Rated 3 out of 5 by from Awesome soundingThis is an awesome amplifier and sounds great. I can definitely feel the difference frommy tratrix speaker system after using this amp. I am not that rich enough to get fancy cabinets to host all my receivers so I decided simplify all the wiring and buya bluetooth module sold at parts express. These amplifiers do not support bluetooth modules it is a pain really when they sound awesome with all the wires connected but ones you connect the RCA to the module instead of connecting it to the actual source. In a few weeks I will post a video on youtube.
Date published: 2014-02-17
Rated 3 out of 5 by from Still untested but prospects look goodAt the time that I am writing this I have not as yet had achance to acctually power thi device up, you see right now Iam in the process of setting up a Comic Book/Anamation, and Music Studio and I am just starting to gather parts from multiple sources, the quality of this amp looks to be some of the best I have seen in its price range in along time.
Date published: 2014-03-07
Rated 5 out of 5 by from Awesome little ampBought this to use in my garage for my 7.1 surround sound setup in my garage. Since the garage was pretty big(28x30) i wanted to put 4 subwoofers in the garage for better coverage and not have any dead spots.Right now i have it hooked up to 2 JL 12W0's running at 4 ohm with a 19.5vdc 6amp laptop power supply. So far so good. I have cranked it up to the point that i couldnt stand it anymore and still was running like a champ. It also is really clean hitting.i will soon be upgrading power supply to the 36 vdc power supply that parts express sells and hope for even better things to come.The only con i have on this is the lack of a gain adjust knob. the dip switchs are ok but would like to get a lil more gain out of it while the rest of the system is at a lower volume. i really have to crank it up to get good bass feel and by that point its to loud to think.
Date published: 2013-04-26
Rated 3 out of 5 by from First AmpThis was my first attempt at building an amp. I think that everything went together as planned. The Amp works, sounds good but, I do get some clipping at higher volumes. Maybe I did something wrong.
Date published: 2013-04-06

Product Q&A

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4x100W TDA7498 Class-D Amplifier Board

Difficulty operating from batteries in series.

In using standard 7.2 Ah SLA batteries... Three in series to make 40 volts causes this amp to have a clipping sound. When I drop it down to 24 volts (two batteries) It sounds louder and less clipping. What is the likely cause of this?I also own the 6x100 version of this amp, it behaves the same.
Asked by: TorClausen2
First, keep in mind that this amp is rated to draw 12 amps at full power. If you run it on 24 volts, its maximum current flow is likely to be in the 7 amp range, barely within your supply's capability, assuming your batteries are factory fresh and have not gone through very many discharge/charge cycles. Thus, assuming all components in your system are working as designed, it would not be unusual for the amp to perform well on 24 volts and sound distorted at 36 volts.Beyond this likely cause, there could be many less likely causes for the behavior you are observing. If you are drawing, say, six amps when you hear the distortion, the first diagnostic step is to measure the voltage delivered to the amplifier. Measure voltages at zero, low and medium signal input. Note what is happening to the voltage at the time you hear the clipping. Assuming you are not drawing more than 7 amps, if one of your 12 volt SLAs has high internal resistance you will see the voltage drop as the load increases. If you have two meters, you can measure the current flow at the same time to refine your observations. SLAs will develop high internal resistance as their plates become sulphated. Sulphation can occur more quickly that you might think if you frequently run the battery completely down between charges or if you delay recharging after each use. (SLAs last the longest if they are kept at or near peak charge so charge them quickly after each use). A third possibility is that you are over-driving the input stages. This might be less likely with a lower voltage. A fourth possibility goes to your speaker or crossover. The speaker may be breaking up under the increased power or may have an intermittent in the voice coil. Does your crossover have protection circuitry. It may have a limiting device that you are unaware of. Some of these devices are not sophisticated and cause a clipping sound when overloaded. Beyond that, I would try systematically varying the inputs, voltages, and speakers/crossovers between the two amps.Bottom line, I suspect that you are drawing more current than your batteries can supply. If so, running two sets of batteries in parallel or lowering your power requirements will solve the problem. Some experts may suggest adding a few capacitors in parallel to your battery to smooth out voltage at peak demand. In your situation, I do not think it will help or be worth the expense. Additional batteries are the more efficient solution.
Answered by: FlyBoy
Date published: 2012-07-27

Gain Settings

I don't see it stamped on the board, like it is on other boards. There are a sw1-4 (missing a sw2) What are the settings? And where would I find them in the future?
Asked by: TorClausen2
Check page 11 of the users manual. On the product page - in the right column, there is a link where you can download it.
Answered by: MarkAJH
Date published: 2012-07-08

what about 4 ohms?

how many watts will this amp put out per channel if i used 4 ohm speakers?
Asked by: home theater guy
The company does not specify. They do not specify past 6 ohms and notice the distortion figures go up It appears this amp is happier with an 8 ohm load.
Answered by: MarkAJH
Date published: 2012-08-02

Is there a way to run one of the two amplifiers in bridged-mono?

I'm trying to creating a 2.1 system with a subwoofer, and I was wondering if there was any way that I could use two of the four channels for a single subwoofer driver?
Asked by: bdamico
You cannot bridge any of the channels in this amp because all 4 channels are already internally bridged.Something you could do is use a dual voice-coil (DVC) subwoofer, and power each voice coil from 2 of the channels on this board.
Answered by: eboyer
Date published: 2012-10-19

computer PSU?

i have a 288w (15A) 12 volt computer PSU. i was wondering if this would work on this amplifier?
Asked by: Eric1
Not recommended for this board, which prefers higher voltage power supplies in my experience. Would probably run, but with much reduced power output and possibly not so great sound quality. Much better idea to get the 24VDC Meanwell power supply (which works very well with the TDA7498 in my experience.Even for 12VDC class D designs, computer power supplies (especially the inexpensive smaller ones) tend to be noisy; most computer peripherals have on board regulator circuits as a consequence. Not great for powering audio amps, even those with good power supply noise rejection.
Answered by: Doc Jones
Date published: 2014-01-17

Whats the difference?

Is there a difference between this amp and the one without the fan? The other one costs more and if the picture is accurate I don't see a header to add your own fan...
Asked by: neo31ny
The 320-302 is a slightly older version witha larger heatsink to negate the need of a fan. The 320-305 is a slightly smaller footprint.
Answered by: MattP
Date published: 2013-02-13


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