Question about Sunfire True Sub MK II Subwoofer

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I have an older Sunfire True Sub MK IV. It is struggling to start when receiving a signal from my receiver, and will "pop" a few times before finally kicking on. It is fairly annoying and I assume it could be damaging the unit. I assume it it probably a faulty capacitor. How hard is something like that to fix, and can anyone recommend a good repair shop near me in Greeley CO. and give me an idea as to the cost. Thanks in advance

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Posted on Jan 02, 2017

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SOURCE: Sunfire True Sub Constant Hum & Thump on Initial Signal

The problem in the subwoofer is at leat 4 bad components
degraded due to heat. Remove the module and ship to
Mr. Transistor 453 Opelika Rd. Auburn, Al 36830.
If your sub is thumping and not staying on at lower levels
I have the fix. Cost is $250.

Posted on Feb 09, 2009

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SOURCE: Blown driver

Posted on Oct 04, 2009

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SOURCE: Low volume on one of my sunfire true sub mkII. It

Before we get too committed to a direction to go, or embark on unnecessary surgery, can we establish that we KNOW it's the speaker and not the amp or source? Perhaps you could swap it with the other one.

Back to basics: is this a sudden-onset problem or did it always behave like this? Try swapping locations with the other one. Bass response is a lot about location, location, location. Standing waves, self-cancellation, phasing. All players in this game.

Posted on Feb 15, 2010

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SOURCE: need to replace whole module.


Price = variable $256 and up, final cost up to the skilled bidder.

Posted on Mar 04, 2011

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Own a Sunfire True Sub MKII, light on but no bass, when volume on all the way it barely hits. Fuses appear to be ok.Circuit board looked ok I dint notice any blown caps or miscolored resistors. Help?

Start with the volume way down on the sub.

Connect the line out of a source you know is working with cables you know work to the inputs of the sub. Try left and right.

This will let you know if the problem is in the sub or the output you're trying to use.

Oct 05, 2015 | Sunfire True Sub MK II Subwoofer

1 Answer

I have a true sunfire sub and an onkyo 703 that has an rca connection for the sub. My question is do I connect my side channel polk 65's directly to the sub in jacks or directly to the reciever? If

The input jacks on the subwoofer panel are for connection of satellite speakers to it's crossover. The outputs are for the crossed over signal input to your receiver or amplifier, as there will be no amplification or channel processing from the subwoofer connection. It's only an optional crossover that may have a sonic advantage over the crossover in your receiver.

What you also can do is connect the speakers directly to the 703 and set the crossover frequency on it.

Dec 07, 2011 | Sunfire True Sub MK II Subwoofer

1 Answer

Sunfire MK II Subwoofer hum. I have a Sunfire MK II subwoofer that hums when it is plugged in (it even hums when no signal is connected). I've tried multiple outlets on different circuits, but hum...

you have a ground loop issue you could purchase a ground loop isolator, jensen makes them for about 40 bucks.I have discovered that if you have cable tv, unplug the incoming cable in your cable box and see if hum disappears.

Nov 25, 2010 | 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

2 Answers

Sunfire annoying popping noises

If you remove the volume knob, and tighten the nut below, it should take care of the popping noise, as well as any input noise issues. Based on my experiences with my MKII

Apr 01, 2009 | Sunfire True Sub MK II Subwoofer

2 Answers

Sunfire True Sub Constant Hum & Thump on Initial Signal


Jun 20, 2008 | Sunfire True Sub Signature Subwoofer

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