Question about Acoustic Research S112PS Subwoofer

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Sub quit working, where do I find new board/amp/crossover panel

Sub stopped working, and I've tried to get audio several different ways, and come to the conclusion that the board is bad, or something on the board is bad. It powers up and I can bypass everything and go directly to the sub which works fine by itself but no amp/crossover. Any Idea where i can get parts.

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  • mrbuckeye3 May 11, 2010

    Do you know what on the board is bad? I'm having a similar problem with mine. I don't know what commonent has failed. The power supply circuit is good but I don't get even as much as a hum out of it. While I've had trouble finding an exact match for some of the key components, I think I could make-do with equivalent parts. I'm thinking of just replacing some common culprits but I haven't dug into it much yet.



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I have the same problem with mine and since Acoustic Research went out of business, I too have been looking for a solution. I may have found an alternative to throwing away this really nice speaker. I found a company on the web that appears to sell an amp that may fit nicely into this speaker enclosure for $99.00. Check it out...

UPDATE Feb-16-2016: This Amp is still going strong since 2012 when I replaced it. The price has gone up to 139.00, but may still be worth it to replace a bad one given the cost of Sub's today.

Posted on Feb 28, 2008

  • 4 more comments 
  • Ullas Sehgal Jan 06, 2013

    Have you physically tried this amp from the website and does it fit into the AR S112PS?? Please let me konw becuase I want to buy it but want to make sure it fits and wil l work.

  • Dan K Jan 07, 2013

    Yes, I purchased it and installed it shortly after I found it. She is still working great and I use it every day as part of my home theatre system.

  • Dan K Oct 04, 2014

    UPDATE 2014-10-04: This new Amp is still working great in my subwoofer and I wanted to update everyone with its status. Enjoy!!

  • Dan K Nov 15, 2014

    New part number for the "Plate Amplifier" itself.

  • Dan K Feb 19, 2016

    UPDATE Feb-19-2016:The Amp is still running like a champ!! It gets used every day as part of my home theater system. Was definitely a great investment back in 2012 when I replaced it.

    Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier

    Current Link to the part-

    Above is the link to the Amp, but the price seems to have gone up to $139.00 USD, so you may want to see if you can catch it on sale or perhaps find a coupon somewhere if they take them.

  • Dan K Jan 30, 2018

    UPDATE: Jan-30-2018 I just wanted to let everyone know that this Amp is still going strong and gets used every day since I installed it.



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If you have power, and the amp has previously worked.
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If that still doesn't work try hooking up a different speaker for testing purposes.

I hope this helps

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I'd need to know what mixer you have, to know if there is a [line out] connection socket and an [internal amp in] connection socket.

"each with own poweramp" I presume means the ep1500's and NOT that the speakers are active (ie containing amps)

***If any of your speakers are active, ask the question again, with more detail.***

So if all your speakers are passive, I offer the following.

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From Subs then to Main spkrs. Make sure power amp is set in stereo mode using this way.

Alternative: You will need at least a 2-way stereo crossover unit inline after mixer and before power amps if the subs don't have a built in passive crossover. Most of them do have passive crossovers in the subs these days. Then separate amps or one channel would drive the subs and the other the main speakers. True stereo would require at least a 2 way crossover and two stereo power amps if hooking them up this way.

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No power

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If the speakers are wired correctly, you may have the crossover set to high pass instead of low pass.

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