6x100W TDA7498 Class-D Amplifier Board

Brand:| Model: AA-AB34181
Product Video
This amplifier board uses three Class-D TDA7498s to generate up to 100W x 6-channels, making it the perfect 5.1 amplifier solution.
  • 6 x 100W Class-D amplifier
  • Small footprint for space limited applications
  • Perfect amplifier board for DIY 5.1 amplification
  • Built-in cooling fan and over-temp protection circuit
  • 14 to 39 VDC power supply required
Part # 
Weight: 1.35 lbs.  
List Price$69.99
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Buy 4-up$56.81
Part # 320-307
Qty:  EA
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Product Details

6x100W TDA7498 Class-D Amplifier Board

Build your own high-power 5.1 amplifier with this 6-channel amplifier board. Three Class-D TDA7498s are used for extreme efficiency. 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 tri-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.

• Three 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
• Six line-level RCA inputs

• Power output (w/ 36 VDC power supply): 100W x 6 (6 ohms, THD 10%), 80W x 6 (8 ohms, THD 10%), 78W x 6 (6 ohms, THD 1%)
• Frequency response: 22 to 22,000 Hz
• Minimum impedance: 4 ohms
• Recommended power supply: 14 to 39 VDC, 18A regulated
• Fixed gain settings: 25.6 dB, 31.6 dB, 35.1 dB, 37.6 dB
• Power input jack: 2.1 x 5.5 mm, center-positive
• Dimensions: 6" L x 4.5" W x 1.4" H

Product Specifications
  • Special FeaturesBoard Only Module
6x100W TDA7498 Class-D Amplifier Board
  • BrandParts Express
  • ModelAA-AB34181
  • Part Number320-307
  • UPC844632096716
  • Product CategoryHome Audio Amplifiers
  • Unit of MeasureEA
  • Product Rating
    (6 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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6x100W TDA7498 Class-D Amplifier Board
6x100W TDA7498 Class-D Amplifier Board is rated 4.0 out of 5 by 6.
Rated 4 out of 5 by from BOOM!I made a 6 channel active Xover boombox with this amp. I used compact 8 in DVC Dayton sub with two of the channels (they don't sell just the driver anymore, but search part# 300-490 and already has a nice box and looks the same :). The other channels power Tang Band mids and tweets (the kind will grills built in). I used a 10in Dayton passive radiator (also discontinued) and an auto 3-Way Clarion crossover. I added a Rolls mini mixer for Mic/Volume duties. I used a high capacity rechargeable 12V battery with a voltage-stepper up to ~35 V so I could get about 200W from the amp+battery or power supply. I did it this way so that I could power the 12V components with the same battery. It is easily the loudest and best sounding battery boombox I can Imagine. Unfortunately, it cuts out at high-ish volume and certainly no where near 600 watts. I don't know if it is the amp or some other issue, but seems to be the amp based on other comments. Still, it works and sounds great, but doesn't seem to offer the power advertized.
Date published: 2014-05-09
Rated 5 out of 5 by from Great amp !Picked up this amp to power a boom box project. I am only using 5 out of 6 channels to power an active setup. I am using an active crossover to derive a stereo two way with single subwoofer. So far I am pleased with the soundThis little amp easily powers the tang band 5 1/4 neo subwoofer, two 4 inch Dayton mid woofer and two vifa textile 1 inch dome tweeter. It is running at 30 volts with a DC boost converter from 12 volt battery bank. As it is only powering small speakers it is running very cool to the touch so I have removed the fan from the heatsink. I played it for several hours with some punishing bass and it remains nice and cool so I will leave the fan off for my application. I imagine if you are running this amp with all channels fully driven it will heat up but for me it is not under serious load. I tested the amp powered from 12 volts and it still has a good solid sound but I recommend a good amount of current at lower voltages. This is a very flexible amp with good channel options. It is very well made with the look and feel of a quality motherboard. The sound quality is pleasing and I can't wait to find more applications to use this multi channel amp for. I am installing some outdoor speakers this year and I may have found my amp solution for that too.
Date published: 2014-03-05
Rated 4 out of 5 by from so far so goodI havent run all 6 channels yet but everything seems to be pumping out pretty good at 8 ohms. Info on these units is spread all over the place, and I've many questions.I'm trying to avoid damaging surges. If I put a power switch on the AC input am I safe in most situations ? Will this help if I remember to turn it on/off ?If I'm not using a channel is it safe to run with :1) no input2) no output3)neitherIs there an adviseable way to hack the power DIPswitch- i.e. a 3 way panel/mount switch that can toggle between on/off/mute(standby) ?I've front-mounted my RCA inputs for various reasons, and now I'm afraid someone will yank one out. This will probably cause an ugly surge. I will either:a)lock the RCA's down somehow.b) think of a way to make a buffer so I can hot-swap inputs on this amp(or switch to a 'mute' status to cut output spike ?)
Date published: 2014-01-22
Rated 5 out of 5 by from excellent valueI've used the Sure Electronics amps for a lot of projects and they have proved both durable and powerful. In one project I needed to deliver a 0.5Hz sine wave at 90W, and it did the job. It is important to note that these things are VERY sensitive to impedance: at 4 ohms with a properly rated power supply they deliver full 100W RMS per channel (sine wave). At 8 ohms, around 55W, and something peculiar: at 6ohm only about 35W. So watch your impedance, feed it plenty of juice and enjoy the incredible savings.
Date published: 2013-10-31
Rated 1 out of 5 by from Don't Expect To Turn The Volume UpThis board sounds good on paper. However, I'm experiencing the same problems documented by others and will be returning the board if I can't get this resolved.When you turn the amp. up to about 3/4 max volume, the sound starts to cut in and out. This is not the same as a normal amp that will start to slowly distort. This is an over current circuit kicking in cutting the sound off and on. I'm using the 36 volt Meanwell PS and am sure it's not a PS problem.So don't expect to be able to fully utilize the full power of this amp out of the box.The solution I'm told is to modify the output filter. I need to do some more research on what needs to be done.
Date published: 2013-08-20
Rated 5 out of 5 by from franken-stereobought the board to build a tri-amped setupquality: average... RCA suck...speaker connections weak.. small footprint though...Power Supply: i used a 36V 20A digikey power supply... was going to try two or three modded computer power supplies but I heard issues will come up if outputs are not isolated.. decided to be safeFeatures: gain is only adjustable in 5 step increments with DIP switches... in three pairs... no individual channel gain... no soft off.. will thump your speakers.. I wired in a tweeter disconnect to protect them.Operation: this system rocks... better performance than name brand bi--tube-amped setup in living room... better clarity, better highs, bright without shrill, rich mids, powerfull lows with no boom..overall: $60, 6CH, 600W.... cant go wrongsidenote speakers are all parts-express... 8" woofer, sealed back 4" mid, dome tweeter.input stage includes, dbx stereo 3way crossover, dbx EQ (not needed but I love tunablilty)
Date published: 2013-02-20

Product Q&A

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If your question requires design or troubleshooting information,
please email tech@parts-expresss.com  for a prompt reply.
6x100W TDA7498 Class-D Amplifier Board

I intend to use the 6x100W TDA7498 Class-D Amplifier Board with my home theater set up. i use a powered subwoofer. i am new to this stuff and was wondering where i would connect my powered subwoofer to on this board? 

Asked by: Andrew_646
The powered subwoofer will not be plugged into this amplifier. You will have to use a separate preamp, or receiver with surround preamp outputs in order to use an amplifier like this. The preamp or receiver will have a dedicated subwoofer output which the sub will plug into.
Answered by: MattP
Date published: 2014-11-10

Hi there. Can you tell me what max current output is pr channel on 6x100W TDA7498 when it is internal bridge ?  How can it be that the amp delivers more power at 8 ohm, than 6 ohm but much more at 4 ohm ? Should´n the 6 ohm power be higher than 8 ohm ?

Asked by: Bastiant
Unfortunately this amplifier is not bridgeable.
Answered by: MattP
Date published: 2014-07-20

Is the fan intended to running continuously on these boards?  

Asked by: Neubie
Yes the fans are always on with these boards.
Answered by: MattP
Date published: 2014-01-27

power supply ?

I know that this amplifier uses 14v to39v at 18 amps but Is it possible to power this amplifier with 24 AA battery's that are rated at 2.7 amps each and at 1.2v ? would that equal to 36v at 64.8 amps? Would that work if so how long would it last ?
Asked by: mdfreeze
That would be 36v but still only 2.7 amps. Wiring batteries in series only adds voltage, not current.
Answered by: MattP
Date published: 2013-07-24

what maximum gain setting with a 350W 36V power supply?

The amplifier has 4 levels of signal gain per channel (25.6 dB, 31.6 dB, 35.1 dB, 37.6 dB), I'm no expert, does it mean it can output a corresponding maximum power of 6W, 25W, 56W and 100W per channel?If that calculus ir correct, I can safely use the 35.1 dB medium gain on each channel (giving a maximum power of 56W x6 = 336W) with a 36V 350W power supply?
Asked by: crespo80
The gain settings have no effect on the maximum power per channel. The maximum power per channel is solely affected by the voltage of the power supply (and the current capabilities of the power supply, to some extent). As stated in the specs, you will get 100W with 6 ohm speakers when using a 36V supply. If you increase the power supply's voltage to the amp's maximum input voltage of 39V then you will get slightly more power, or if you use speakers with a lower impedance (that is, 4 ohms) then you will also get more power. However you won't get much more power because the TDA7498 chips that this amp uses have an aggressive current-limiting feature that will instantly turn off the amp for a few tenths of a second if the limit is exceeded.As mentioned, the current capabilities of the power supply will also affect the power output of the amp to some extent. For example, if you use a 36V power supply that is capable of supplying about 150W continuously, then you should have no problem getting 100W into a 6 ohm speaker on ONLY one channel. However if you try using all 6 channels with this power supply then you will not get 100W on each channel because the power supply will not be able to supply enough current.All that the 4 gain settings on this amp do is change how much the input signal is amplified. So, they are basically a volume control with 4 settings. They are there so that this amp can be used with a variety of sources, ranging from sources that output an audio signal that is very quiet to sources with very strong outputs. You will get the same power output from this amp no matter what gain setting you use. However, if you use a device with a weak output, and set the amp's gain to its lowest setting then you won't actually make use of the amp's maximum output because you aren't providing enough gain. Also, if you use the maximum gain setting when using a source with a very strong output (such as a good mixer) then this will not affect the maximum power output of the amp. It will only cause the amp to clip at a lower volume level because it is being amplified so much by the gain setting.In regards to your power supply selection, it should work no problem. When it comes to class-D amplifiers, such as these ones that Parts Express sells or virtually any other class-D amp out there, as a general rule you can use a power supply that is capable of putting out about half as much power as the maximum power level of the amp. So, this is a 600W amp, which means that a 300W power supply should be fine. This is because typical music is very dynamic: it has lots of quiet sections, and it will only occasionally cause the amplifier to output its maximum power. The only way to make an amplifier continuously output its maximum power is to feed a pure sine wave through it at full volume. Most people rarely do this (it's mainly only done for testing), and if it is done then virtually no-one sends pure sine waves through ALL 6 channels at the same time at full volume.
Answered by: eboyer
Date published: 2014-11-08

Lion 36v battery pack.

How about using a 36v lion pack from a power tool? I'm trying to figure the cost/performance ratio. How long would a 2 a/h battery last? Would it vary according to how hard you run the amp and how many channels you used? The requirement of 18amp supply just represents sustained peak , but in an efficient class d amp how often would it need this value?
Asked by: Cod65
Yes, this will work. As you say, how long this will work depends very heavily on how loud you play it, and how many channels are drawing power. The 18 amp draw would come about if all channels were drawing close to 100 watts.36VDC * 18 A = 648 Watts648 W * 90% efficiency = 583.2 W583.2 W / 6 channels = 97.2 W per channelThis level sustained would sound bad due to 10% THD. You are much more likely to run into hard bass notes which very briefly need to draw that much amperage. Thus, the difficulty in saying how long it will last. If you were drawing the full 18 amps (648 watts) constantly, your battery would last 6 minutes an 40 seconds, in a perfect world. If you were drawing 1 amp constantly (36 watts) it would last about 2 hours. If you are listening at moderate volume, it would be somewhere in between. Either way, this battery is not a great way to power a 6 channel amp.If you really want to do this and need it to be portable and all 6 channels to play really loud get three 12 volt sealed lead-acid "gel cell" batteries. Wire them in series to get 36 voltsIf you don't need need all those channels, go with a 4 or 2 channel amp that doesn't require as much voltage. With the 4 channel amp you could use the same SLA "gel cell" idea with only 2 batteries. Gel cells can be found that are rated at up to 100 Ah.
Answered by: Travis Rysdam
Date published: 2014-08-12


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