M & K V2B Subwoofer - Blowing Fuses - AVS Forum
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post #1 of 9 Old 12-02-2012, 12:06 PM - Thread Starter
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I have a 'vintage' M & K 12" Powered subwoofer that keeps blowing fuses. This is the fuse that is accessible from the outside rear panel.

It was working just fine after years of incredible performance and this started happening. I bought the same fuses from Radio Shack and they blow pretty much right away when powered on.

Anyone know of the problem?
Worth fixing?

If not, any resale value?

The 12" driver was recently re-coned and sounded as new until the fuse problem happened.

Please advise.
Thanks!
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post #2 of 9 Old 12-03-2012, 12:28 PM
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No help, other than to say that my V3B did / does the same thing. I recently re-foamed it, it worked awesome for a month of so and has now developed a loud hum, which in turn causes the fuse to blow. Anyway, I'm interested in help too.

Does your hum when you first plug it in before the fuse blows?

I've never experience FULL audio until now. I never knew what I was missing. WOW what a difference.
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post #3 of 9 Old 12-04-2012, 05:18 PM
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Hmmm,
My mk-mx 200 did develop a loud humm, turns out it was an earthing problem! And also a problem with the pentiometer!
Is your sub well earthed?
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post #4 of 9 Old 12-04-2012, 10:16 PM - Thread Starter
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Hey thanks for your replies.

jw00dy: I don't recall a loud hum. Been a long time since I had it hooked up. Just recall "where's the bass"?
Then when I checked the fuse, it was always blown.

youngaudiolover: Don't think it's an earthing problem. Sub has been in the same place for several years working flawlessly. Then all of a sudden starts blowing fuses.

Not sure what to do with the sub....seems such a shame to throw it away. Now using as a TV stand for a 37" LCD.

BTW: have since replace the unit with a Def Tech Supercube 1....AWESOME sub! Incredible earthshaking power.
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post #5 of 9 Old 12-04-2012, 10:42 PM
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just saying, mine was fine for a while also
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post #6 of 9 Old 12-05-2012, 12:30 PM
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Mine didn't hum either until I replace the fuse, then I heard it hum, then blow.

I agree, such a shame to lose a wonderful sub. I've considered buying a new amp for it, but I'm not sure what exactly to replace it with. 100wRMS with dual voice coils is what mine has if I remember correctly.

I've never experience FULL audio until now. I never knew what I was missing. WOW what a difference.
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post #7 of 9 Old 12-05-2012, 12:34 PM
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Quote:
Originally Posted by youngaudiolover View Post

Hmmm,
My mk-mx 200 did develop a loud humm, turns out it was an earthing problem! And also a problem with the pentiometer!
Is your sub well earthed?
What do you mean buy well earthed? Grounded?

So did you replace the potentiometer yourself? How did you know it was bad... I know that's a loaded question since I do not have any equipment besides a basic volt/ohm meter for testing smile.gif

I've never experience FULL audio until now. I never knew what I was missing. WOW what a difference.
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post #8 of 9 Old 12-08-2012, 02:42 AM
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Well the fact that every time i turned the volume knob the hum would get alot louder and make the woofer pop out.
And the grounding of the subwoofer stopped the continious hum,
You can get pentiometer's for $4.00 from a local electronics store.
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post #9 of 9 Old 12-08-2012, 06:58 AM
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Both loud humming and blowing fuses are indicative of a bad amp. The next thing to blow will be the driver. This is one of those 'if you have to ask what's wrong you don't have the skill to fix it' questions. If you think the amp is worth the $50 bench fee it will cost for a tech to even look at it do so. Otherwise replace it.

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