2x250W IRS2092 Class-D Amplifier Board

Brand:| Model: AA-AB32291
Product Video
If you absolutely have to have 250 clean watts of stereo power, look no further than this amplifier board. An IRS2092 is combined with two IRFI4020H-117P power MOSFETS to deliver power effortlessly. Two 55 to 65 VDC power supplies are required for operation. See note below.
  • Power output (with two 56 VDC power supplies): 250W x 2 (8 ohms, 1% THD), 100W x 2 (8 ohms, 0.1% THD)
  • Class-D IRS2092 amp IC
  • Two IRFI4020H-117P power MOSFETS
  • Based on Internal Rectifier''s AMP7D-200 reference design
  • Requires two 55 to 65 VDC power supplies (see note below)
Part # 
Weight: 1.05 lbs.  
List Price$89.99
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Buy 4-up$54.89
Part # 320-313
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Product Details

2x250W IRS2092 Class-D Amplifier Board

This two-channel Class-D amplifier board is based upon the Internal Rectifier AMP7D-200 reference board, using the IRS2092 amplifier IC and the IRFI4020H-117P power MOSFET, and is able to deliver amazing amounts of clean output—up to 250 watts x 2—into 8-ohm loads.

Two 55 to 65 VDC high-voltage power supplies are required for operation; each power supply dedicates its full output potential to a single rail for maximum output. This results in increased high-fidelity output, dynamic range is a high 100 dB, damping factor is 120, and total harmonic distortion and noise is 0.1% at 100 watts into an 8-ohm load.

This amplifier board also includes a myriad of protection features: over current, over/under voltage, DC output, and temperature protection circuits are built-in. A rather small footprint lends itself for use in space limited applications.

Note: Minimum recommended power cable size is 16 AWG. This amplifier board requires two power supplies. We recommend two of the 48 VDC, 12.5A regulated power supplies adjusted to 56 VDC of output as a minimum requirement. This amplifier board is recommended for experienced users only with the proper equipment to measure the voltage output of the power supplies. Failure to use the minimum recommended power supply voids the warranty of this amplifier board.

• Stereo Class-D amplifier featuring the IRS2092 amplifier IC
• Dual IRFI4020H-117P digital audio MOSFETs
• Over current, over/under voltage, DC output, and over temperature protection built-in
• Screw-down power input and speaker output terminals
• Robust heatsink for passive cooling

• Power output (with two 56 VDC power supplies): 250W x 2 (8 ohms, 1% THD), 100W x 2 (8 ohms, 0.008% THD)
• Power requirement: 55 to 65 VDC, 12.5A regulated
• Frequency response: 20-35,000 Hz (±3 dB)
• Dynamic range: 100 dB (A-weighted)
• Damping factor: 170 (4 ohm load @ 1 kHz)
• Efficiency: 90% (8 ohms, 250W)
• Dimensions: 5.7" L x 3.9" W x 1.4" H (2-3/8" H with heatsink, 2-7/8" H when mounted on standoffs)

2x250W IRS2092 Class-D Amplifier Board
  • BrandParts Express
  • ModelAA-AB32291
  • Part Number320-313
  • UPC844632096730
  • Product CategoryAudio Amplifier Boards & Modules
  • Unit of MeasureEA
  • Product Rating
    (9 Reviews)
  • Weight1.05 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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2x250W IRS2092 Class-D Amplifier Board
2x250W IRS2092 Class-D Amplifier Board is rated 4.4444 out of 5 by 9.
Rated 4 out of 5 by from Awesome little amp board!I didn't really expect much from this little amp mainly due to the price but I was pleasantly surprised when completed the project and got to listen! I used a 800VA 45VAC secondaries torrid transformer I had bought for a different project and added a rectifier/filter board I purchase for a different site and assembled. In total there is 48,000uf capacitance for each the +/- rails with loaded voltage of 64VDC feeding the little amp board. No noise or hum and the sound is excellent! I swapped out a old Mitsubishi DA-15 power amp for this little amp board when completed and the power output of this board was the same as the Mitsubishi it replaced and the quality of the sound was the same until the heat sink on the little amp got hot then the sound was actually even a little bit better. I am very happy with this little project and can't believe the sound compared to the price.
Date published: 2015-03-20
Rated 5 out of 5 by from Formerly the BIG GUNSIf memory serves, the first couple years bought goodsn from PE and frequented all parts of the site almost daily, this amp was the "BIGGEST" amop board PE offered. I have stocked up on all sorts of parts, a lot of them PE parts, over the years, and now I have two of these 250x2 Sure boards. It's time to use one - so I came back to its home to see if there had been any news or developments. HOLY SMOKES! You guys are no joke! Some of these reviews are complete greek to me, after buying and playing with, installing and using dozens of these Sure boards- all smaller wattages than this one. I was going to try to use two 12V 20A power supplies on this and now I am questioning the sanity in that. Even wiring those two power supplies has confused me, as the manu8al has some kind of wire one supply + to the amp +, the - to the amop GND. The second supply + to the amp ground and the second supply - to the amp -. HUH!?!? Never even heard of doing such a thing. I also like the idea of putting this in an old receiver. I have plenty- probably with a variety of power or space to add power if need be. So- glad I came back here and didn't just drive in and fry some stuff. Thanks PE reviewers! Back tot he drawing board!
Date published: 2014-12-08
Rated 4 out of 5 by from Amazing what it does for the priceThis is a surprisingly impressive little amp. I mounted it inside an old rack mount case. Bought an old Pioneer receiver at a garage sale for $3 just to get a shielded, 47VCT transformer. Then I built a simple full wave bridge power supply with a pair of 33,000uF/80V caps; this ended up producing +/-64V for the amp.As the other reviewers noted, get the reference design from International Rectifier. It used a nominal 70V and did all the performance testing at that voltage, and recommended operation from 60-80V. I was able to vary my supply voltage with a variac and saw no issues within that range.Check the frequency of the PWM clock oscillator. As it came out of the box, it was dumping large clock signal across my test loudspeakers. One channel was at 256kHz and the other at 309kHz, and the output inductor ran very hot, much hotter than the heatsinked mosfets! This clock signal is very noisy (i.e. it's not a pure tone) and will ride on the waveform of whatever music you put on the input. Whether or not you can hear it depends on the music but it's quite obvious on a scope. I found that the two pots could be adjusted to bring them up to 400kHz. This of course greatly reduced the clock signal across the loudspeakers, allowed the inductor to run a bit cooler, and reduced the modulation to a negligible level. I set them about 30kHz apart to ensure no audible beat would be produced. The supplied documentation says nothing about any of this. The two little pots that adjust the frequency are touchy and cheap so be careful.The output inductor (one for each channel) carries all the load current and dissipates much of the power of the clock, so it runs hot and since it's mounted so close to the output cap (almost touching) it will probably destroy the cap over time. For long term reliability either relocate the output inductors to a heatsink or install a fan. By the way the MOSFET's on the small heat sink never got more than just warm to the touch.I ran the amp through a bunch of tests using an APX525 audio analyzer and a dummy load that could be switched for 4, 8, or 16 ohms. Basically the amp met all the specs on the Parts Express website, and in the original I.R. reference design. Here's a summary of my testing:Voltage gain: 30.2dBInput level for 1dB clipping: 1.4Vrms (this level produced 44.7Vrms into 8 ohms, corresponding to about 250W)Amp is perfectly linear from 1mV input up to >1000mV input, two channels are identicalFrequency response (4-ohm load): 6Hz - 38kHz (+0/-3dB)Frequency response (8-ohm load): 6Hz - 65kHz (+2/-3dB)Frequency response (16-ohm load): 6Hz up to a +10dB peak (ringing) at 45kHz. Don't operate the amp with a high impedance speaker.THD+N (A-weighted): < 0.003% from 5Hz - 1500Hz, then rises to a max of .008% at 10kHz, while driving 60W into 4 ohms (i.e. the test conditions in the original design document).S/N: if used as a subwoofer amp below 1kHz, this is about 100dB A-weighted. This degrades significantly above 10kHz. I was pleasantly surprised as i didn't use a toroidal transformer. I expect this could be much worse if i hadn't used good construction techniques.Residual noise and DC: roughly +/-2mVrms; slight dc component of about 4mV (negligible)Crosstalk: -65dB at 10kHz; better than -82dB at 1kHz and belowInter-channel phase: both channels within 1 deg. for all loads, at 1kHz and below.Damping Factor (10Hz-1kHz): 142-181 into 4 ohms; 213-303 into 8 ohmsEverything about this amp suggests it would be excellent for driving a subwoofer. It offers very low frequency response, very low distortion, and of course super efficient performance at high power levels into a 8-ohm or lower load (it prefers 4 ohm). It clips gracefully and has plenty of protection features built in. Now that i've built it and seen how well it performs, i intend to use it to push a pair of 12 or 15" SB Acoustics subs in sealed enclosures. I expect this to be a great setup. I would hesitate using this for critical, audiophile listening over the entire audio range, due to the clock noise, potential for ringing above 1kHz, and concerns about the output network.The included documentation with the amp is poor. It has contradictory information about the power supply voltage range, and omits details like the proper audio input levels, preferred loads, the built-in switch feature, how the protection circuits recover, and how to set the oscillator frequency. If the original IR document weren’t available on the web, the end user would probably have some real head scratching moments with this amp.Build quality and appearance are good, but watch those output inductors. And don't get too rough with the power and speaker connectors as they aren't mechanically supported by anything other than their pins.
Date published: 2014-07-24
Rated 5 out of 5 by from Rebuit an old Marantz m250 with this amplifierI had an old Marantz m250 - 125wpc amplifier that after 25 years of never being shut down - ( repairs finally were no longer an option) but it had a 60 volt dual rail power supply that was rock solid with almost new 24,000uf filter caps and speaker protection circuit. Stripped it down and used the IRS2092 board. Results are excellent - much cleaner sound and lots more power - 250wpc and its running clean - even with a scope on the waveform - nice. Let it run hard( pretty much wide open with live recorded audio( so lots of compression) - for 2+ hours - with the small fan I added it stayed cool. No where near strained it. Total investment - right at $100 - including new speakon connectors, Neutrik power cord connectors, 1/4" Neutrik input connectors
Date published: 2014-02-25
Rated 5 out of 5 by from WOW!I own my own home recording studio. When the music stops, I don't want to hear any hiss or hum. I tried it and WOW!. It's now part of the studio. I'm running the amp on +/-60V with an Avel toroidal 40-40 transformer from Parts Express. If you hook up the transformer as shown on the cover, it will work but you will get a serious hum. Primary OK. Secondary use the black and yellow to the bridge rect. Red and orange to P-ground. Food for thought.
Date published: 2014-01-25
Rated 4 out of 5 by from Upgraded an old Shure with a Class-D SureI purchased the IRS2092 as a repair part for a 35 year old Shure Promaster PA/Mixer. I replaced the original amplifier cards with this amplifier and so far I am finding good results. I am powering it from the legacy bipolar 60 volt linear supply. I found it needed just a little help with cooling the heat sink. A small fan is likely more than good enough for the task.While I am impressed the audio quality, some of the solder quality could bit better and I was surprised to find that the printed circuit board is board on both axis.The documentation (on line only) was good enough to get me off the ground running. I found more complete documentation on the International Rectifier site for the IRAUDAMP7D reference design. The IRS2092 appears to be the surface mount version of this card with a few features (start up muting and bridged mono) left out. It does not appear that it would be rocket science to get bridge mono working on it although this is not supported by the manufacture.I would recommend thus card to others who want to experiment and experience a good Class-D reference design. The quality issues, although small, would not make this an appropriate product for use in commercial applications.If time and budget allow, I may upgrade the power original Shure (not Sure) Power supply to see how it affects performance.
Date published: 2013-08-06
  • 2015-03-28T06:55CST
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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 tech@parts-expresss.com  for a prompt reply.
2x250W IRS2092 Class-D Amplifier Board

I'm looking at building an 8 channel amplifier using 4 of these boards - what power supply setup would be suitable?

Asked by: john000
We do not have one power supply that will work for four of these amplifiers. One amp board requires two of the below supplies adjusted to 56 V output as indicated in the notes on the amplifier page.http://www.parts-express.com/48-vdc-125a-600w-regulated-power-supply--320-317
Answered by: MattP
Date published: 2015-03-18

Does it work with 4 ohm speaker too? Or will it get too hot?

Asked by: SystemHD

I need to run this in bridged mode and read the comments which stated it did not have the required inverter. Is this the unused IC U300? If so can it be installed and configured to then run in bridged mode? I am used to soldering SMT components.

Asked by: mike2014
This amp is not bridgeable. Any modifications of that nature would unfortunately void the warranty.
Answered by: Chrisf
Date published: 2014-12-06

Will this amp work with a 32-0-32 transformer?

Asked by: Darkstar52
No it will not.A 32-0-32 transformer will give you theoretically 32 X 1.414 or 45.3 volts DC on the capacitors. Counting voltage drop in the bridge rectifier and transformer windings, a more realistic multiplier is 1.3, so 32 X 1.3 = 41.6 volts DC at the capacitors (that is, your power supplied to the amp board would be 41.6-0-41.6 volts DC).The amp board has several protection circuits including an under and over voltage shutdown. The specified operating range for the board is 55 to 65 volts DC (plus and minus rails).Therefore, 41.6 volts is too low (less than 55) and the amp would not power up (i.e. come out of reset).The best transformer voltage to use with this amp and your own power supply is a 40-0-40 volt unit, either 500VA or 625VA. I would recommend either the Avel Y236804 500VA 40V+40V Toroidal Transformer (Part# 122-670) or the 625VA version (Part# 122-690), along with a suitable bridge rectifier and a pair of good capacitors at least 20,000 uF each and at least 63 WVDC.Hope this helps!
Answered by: RogerK
Date published: 2013-09-03

Power Supply Capacitance Requirement

I would like to build the 2 power supplies required for this amp. Can someone advise on the capacitance required per rail? I'm using a 40VAC-0-40VAC 600VA toroid, 25A/400V bridge rectifiers as recommended. I have 8,200uF/100V caps, and I was thinking of using 4 per rail, or 32,800uF. Is that enough, or overkill? Thanks.
Asked by: hongrn
Here is an excellent link to proper DC power supply design DC:http://www.changpuak.ch/electronics/power_supply_design.phpI am using 18,000 per 72 vdc rail which is a little low. Think about a soft-start circuit to bring the psu online slowly. Something like this:http://electronics-diy.com/soft-start-for-power-supply.phpSaves wear and tear the psu.One last circuit I used was to delay connecting the speakers to the amp for about 5 seconds and removes them immediately when the AC line power is removed from the amps power supply.These amps, at least mine, is brutal on speaker when powered down.Good luck!
Answered by: The Fixer
Date published: 2014-01-29

The mosfets are not working

I am injecting +-60VDC to the board but it does not work, the LED1B and LED1A does not light up. I am guesting there must be some sort of protection issue that is preventing the mosfet to work. I checked the protection system and it can not be over and under voltage and obviously its not over temp protection. could you help me with some trouble shooting ideas?
Asked by: Faraz
Mine would not run with less than +- 61.8 VDC for whatever reason. It now runs off +-72.5 VDC PSU and has been for months.Might be a bad amp board too you never know.Good luck!
Answered by: The Fixer
Date published: 2014-02-18
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