Question about Acoustic Research AR3 Speaker

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AR3 sunfire problems

I've been trying to get a set of AR3 Hi rez Sunfire amp powered subwoofer speakers fixed. One of them blows the fuse on my amp and both of them no longer have the STANDBY power feature, leaving the amplifers on all the time. I can't find anyone with a schematic for the AR Sunfire amplifier or a parts source. I've tried to contact Acoustic Research, Recoton, Thomson as well as several amplifier and speaker repair facilities in Florida with no luck. Any suggestions or help would be appreciated.

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Re: AR3 sunfire problems

I had the same exact issue with my AR1s. Found that was able to repair it for about $187.50 with return shipping included. Apparently there were a couple leaky caps and some bad resistors. My guess is that when Recoton built these amps, based on Bob Carver's Sunfire technology, they used defective capacitors. These, in turn are probably blowing the resistors and possibly some of the other components.

Posted on Nov 11, 2008

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Re: AR3 sunfire problems

It's not a solution but I have the same problem. I found two transistors shorted in the subwoofer amp, a 2SC3281 and an IRF640. I replaced them but there is still a large dc offset in the output, about 10.5 volts. Without a schematic I'm kind of just fishing.

Posted on Oct 08, 2008

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Re: AR3 sunfire problems

Just wondering if you were able to get any more info on this problem. My house got hit by one of Orlando's famous lighting storms a few weeks ago and along with about $1,000 worth of other equipment, both of my AR5's took a hit. They blow the 5 amp fuse immediately when powered on. So now I'm looking for some help with these as well. Mark

Posted on Aug 15, 2006

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Re: AR3 sunfire problems

Try Good Luck

Posted on May 09, 2006

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SOURCE: Acoustic Research AR1 HiRes subwoofer amplifier

hello sir

Posted on Aug 25, 2008

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1 Answer


Check to see who the manufacturer is. The Acoustic Research name was sold a couple of times. I think yours may be Recoton. If so, you may be able to get some help from them.

Aug 24, 2014 | Speakers & Subwoofers

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No Power


if u change the fuse inside the actual sub shud power up ok


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How do you remove the volume knob on the Sunfire Subwoofer? Does it pull out easily or do you have to take the amplifier plate off and tighten from the inside?

I had the same problem as this, the fix was quite simple and the hum never came back.

If you pull straight out on the sub amp's volume knob it will slide off, then to fix the hum, tighten the nut that is behind the knob on the potentiometer and your hum should go away. My hum went away and never came back after this fix. Hope this helps you.

Mar 31, 2013 | Sunfire True Sub MK II Subwoofer

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Blowing the 7.5 amp fuses as soon as I plug the power in.

hello, the reason for the this is because theres a dead short in the unit someware i'd check the diodes first with a multimeter then the transistors then the resistors then the capacitors


Dec 03, 2010 | Sunfire True Sub MK II Subwoofer

1 Answer

Internal 5 watt fuses keep blowing when I turn on the unit.

hello the reason for that is there's a dead short somewhere it could be a transistors also check the diodes as well but make sure the power's off
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Oct 17, 2009 | Sunfire True Sub MK II Subwoofer

1 Answer

Sub doesnt do anything while plugged in ( Sunfire mk II)

Some subwoofers can sense the signal on their input and will only start when there's enough signal for long enough time for them to turn on the amp.

Try seting the "subwoofer signal out" on your reciever a bit higher, see if it does the trick, if not, try it with some other source (e.g. an mp3 or CD/DVD player) plugged directly into the subwoofer. If it still doesn't work, there's some other problem with your sub (bad connection inside sub, sub amplifier problems, maybe there's another fuse for the speaker itself, try to check it out).

If it works well with an alternate signal source, the problem might be either in reciever or the signal cable that you use, but could also be something else.

good luck

3rq8 (Triarcuate)

Jul 15, 2009 | Sunfire True Sub MK II Subwoofer

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AR1 Subwoofer Keeps Blowing the 5 Amp Fuse

Well, so far so good. I reinstalled the newly repaired amp and fired it up and so far, so good. Ran it through about an hour of fairly intense break-in tracks and then ran it through about 2 dozen power up and down cycles to try to get it to fail (better now than a month from now and have to fight them on backing it up).

Jun 01, 2008 | Acoustic Research AR1 Speaker

1 Answer

Has light but no sound

The first thing to always check first is the fuse. This will probably involve some disassembly but it is alwayst the cheapest fix and a constant issue.

Aug 14, 2007 | Sunfire True Sub Signature Subwoofer

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