Cerwin Vega Sub Woofer -- buzzy distortion

Bad (intermittent oscilation ) powersupply triggered by

Wow, that's a really good scientific test...

Properly test the speaker.

Monitor the power supply rails while increasing the volume.

Wow that's a really idiotic reply seeing the OP is a guitar player and not a scientist.

In reality the mechanical manipulation of the speaker cone is a valid fundamental test. Next test would be to subsitute the amp. The result should be obvious.

Just goes to show what you know about service work then ...

Arfa

"Peter Dope"

Like the majority of test procedures, it is not *absolute* - but if the device fails the test you have your culprit.

However, it passes the test, there are other tests that may need doing.

It is possible to perform a very large number of tests on a loudspeaker, not one of which conclusively proves it has no faults.

But if the OPs test is failed, then none of them need doing.

..... Phil

"Lovguitar"

Also try the woofer with another amplifier - even a guitar amp will do.

Leads with alligator clips at each end are very handy for this.

.... Phil

Piss off then. If he's a guitar player, he should not be trying to fix electronics, right?

It's obvious that you have contributed NOTHING to this thread, and I did give him good advice.

Clearly more than some people (I'll exclude you, since you do know what you are doing.) bottom line is that that test is very limited, and won't show the problem that he's experiencing which is distortion at higher volume levels...

Agreed.

You gave the OP an ear full of hateful, self-righteous spew.

OK, I'll give you that, but the test will pick up most raspy distortion problems that are to do with the speaker itself. Sometimes, however, the problem can be due to mechanical resonances which only show up at high drive levels, in which case the push - pull test will, as you rightly say, reveal absolutely nuffink ... :-)

Arfa

"PeterDope"

Given that the speaker is not poling against the magnet structure nor has loose turns on the voice coil ( his tap and pull test shows that) the odds are very high that the problem is with the driving amp.

.... Phil

Agreed

Arfa

No, I told him his test was flawed, then suggested what he should do... The self-righteous spew wasn't mine... OF course one of the proud flamers thought it woudl be funny to snip off the helpful advice I gave, and leave what they felt was not helpful...

So again: check with a known good speaker, if it still distorts monitor the power supply rails while the symptoms exist.

So if people don't like that advice, and think it is hateful or self-rightous, well tuff s*it.

Be gone child. I have nearly 4 decades in pro audio so don't insult my intelligence with your mouth full of piss.

I have as much experience as you do, and as long as you snip the valid advice I give, leave your flames and s*it, you look like one big s*it head. So your advice back to you: be gone, you are acting like a child, altering my text in quoted sections to suit your childish attitudes and basically just piss-off, you are trolling, and poorly at that.

Now for the last time: test with a known good speaker, and monitor the power supply rails as a starting point. And, meathead, don't bother replying, and if you do reply DONOT alter my comments as you did above. Now, f*ck off.

Then show your maturity you blabbering Fool.

Bwa-ha-ha-ha... Yea, right like you have showm maturity...

At least I don't alter other people's words in quoted sections, changing things to make a meathead post seem reasonable...

I'm tired of you, kid. Go waste someone else's time.

Stop it boys ... d :-\ )

Arfa

Arfa