Re: Subwoofer humming

From: Michael Rabeno (mrt2_at_[nospam)
Date: 10/16/04 

Date: Sat, 16 Oct 2004 16:47:32 +0200

yes they are. actually the sub is fed from the controlled outlet on the
receiver, so the sub won't always be on, but only when i'm using the sound
system.

"James Sweet" <jamessweet@hotmail.com> wrote in message
news:Cj%bd.71$5l3.42@trnddc02...
>
> "Michael Rabeno" <mrt2@[nospam]netvision.net.il> wrote in message
> news:416fde51$1@news.bezeqint.net...
>> Hi,
>>
>> Home-made 10" subwoofer unit, connected to Kenwood AV-Receiver model
>> KRF-7050D. it has it's own PS and internal, DIY 2x10W amp kit.
>> When i turn on the power, the unit produces a loud hum, and after about 2
>> sec. the hum is quiet but still present. when i mute my receiver, the hum
>> goes away, so i suspected the input is bad. the thing has proper
> grounding.
>> i replaced the PS, as i thought it inserts hum into the system, but no
> good.
>> after checking the amp there were some loosen electrolytic caps (cold
>> solder), which i re-soldered (i have this amp for about 12 years or so).
>> i
>> soldered another electrolytic cap to the input side of the amp (100uF,
> 10v)
>> and tested it - now the hum is gone completely, but along with the hum
> went
>> the sound it should produce.
>>
>> anything else i should check? / i've done wrong ?
>>
>>
>
> Sounds like a ground loop, are both the sub and the reciever plugged into
> the same outlet?
>
>

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