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From: Lovguitar on 25 Dec 2009 14:03
I have a Cerwin Vega HT-S12A subwoofer that has begun making an
electronic distortion. The speaker itself seems fine when I do a push
pull and tap -- no voice coil rub. Just putting my hand near the
speaker causes a slight humming, however. The gain of the unit seems
OK, it gets pretty loud, but the louder you turn it the louder the
distortion gets. I've taken to turning the unit off because even when
it's getting no signal it will start to hum and buzz sometimes. Not a
60 cycle sounding hum, a buzzy distortion.

Any troubleshooting ideas?

Thanks and Happy Holidays!

Paul
From: Sjouke Burry on 25 Dec 2009 14:59
Lovguitar wrote:
> I have a Cerwin Vega HT-S12A subwoofer that has begun making an
> electronic distortion. The speaker itself seems fine when I do a push
> pull and tap -- no voice coil rub. Just putting my hand near the
> speaker causes a slight humming, however. The gain of the unit seems
> OK, it gets pretty loud, but the louder you turn it the louder the
> distortion gets. I've taken to turning the unit off because even when
> it's getting no signal it will start to hum and buzz sometimes. Not a
> 60 cycle sounding hum, a buzzy distortion.
>
> Any troubleshooting ideas?
>
> Thanks and Happy Holidays!
>
> Paul
Bad (intermittent oscilation ) powersupply triggered by
60(120)Hz ripple current?
Or the same somewhere in the amplifiers?
From: PeterD on 25 Dec 2009 15:10
On Fri, 25 Dec 2009 11:03:24 -0800 (PST), Lovguitar
<lovguitar(a)aol.com> wrote:

>I have a Cerwin Vega HT-S12A subwoofer that has begun making an
>electronic distortion. The speaker itself seems fine when I do a push
>pull and tap --

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

>no voice coil rub. Just putting my hand near the
>speaker causes a slight humming, however. The gain of the unit seems
>OK, it gets pretty loud, but the louder you turn it the louder the
>distortion gets. I've taken to turning the unit off because even when
>it's getting no signal it will start to hum and buzz sometimes. Not a
>60 cycle sounding hum, a buzzy distortion.
>
>Any troubleshooting ideas?

Properly test the speaker.

Monitor the power supply rails while increasing the volume.

>
>Thanks and Happy Holidays!
>
>Paul
From: Lawrence Livermore on 25 Dec 2009 15:33
On Fri, 25 Dec 2009 15:10:39 -0500, PeterD <peter2(a)hipson.net>wrote:

>On Fri, 25 Dec 2009 11:03:24 -0800 (PST), Lovguitar
><lovguitar(a)aol.com> wrote:
>
>>I have a Cerwin Vega HT-S12A subwoofer that has begun making an
>>electronic distortion. The speaker itself seems fine when I do a push
>>pull and tap --
>
>Wow, that's a really good scientific test...

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.
From: Arfa Daily on 25 Dec 2009 19:02

"PeterD" <peter2(a)hipson.net> wrote in message
news:507aj5194dq54eqj6pleu0khetgrq1sr3p(a)4ax.com...
> On Fri, 25 Dec 2009 11:03:24 -0800 (PST), Lovguitar
> <lovguitar(a)aol.com> wrote:
>
>>I have a Cerwin Vega HT-S12A subwoofer that has begun making an
>>electronic distortion. The speaker itself seems fine when I do a push
>>pull and tap --
>
> Wow, that's a really good scientific test...
>

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

Arfa


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