Have been bought a Sharp HT-DV40H dvd home cinema system and the
subwoofer has a low level hum which is noticable at low level playing,
its a passive subwoofer so no mains transformer in it, at first I
blaimed the subwoofer its self but after plugging another speaker in I
get the same hum.

I do notice that the speaker cable is the bog standard speaker cable
and wonder if I get better cable if it would cure it.

This happens no matter what I am playing be it radio/cd/dvd or through
the optical sky input.
I have now turned all off at the mains apart from the home cinema its
self and it still hums.
When I reduce the volume to 0 it goes when I turn it up above 0 its
back.


Anyone come across the same problem?

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...
Have been bought a Sharp HT-DV40H dvd home cinema system and the
subwoofer has a low level hum which is noticable at low level playing,
its a passive subwoofer so no mains transformer in it, at first I
blaimed the subwoofer its self but after plugging another speaker in I
get the same hum.

I do notice that the speaker cable is the bog standard speaker cable
and wonder if I get better cable if it would cure it.

This happens no matter what I am playing be it radio/cd/dvd or through
the optical sky input.
I have now turned all off at the mains apart from the home cinema its
self and it still hums.
When I reduce the volume to 0 it goes when I turn it up above 0 its
back.


Anyone come across the same problem?

It will be mains hum. Try moving the speaker, but my guess is the leak /
coupling is internal.

Well its not a problem from the mains external to the machine as Ive
isolated the machine and filtered the mains with a 6-Way Mains
Conditioner but I do now think that it is internal mains hum as I have
done everything I can.

I did receive an email to say that a lot of home cinemas with dvd are
prone to making a hum noise when played at low volume

So guess Iam stuck with it, I now disconnect the woofer if Iam
watching or listening to anything that I want low volume on

I phoned my supplier and they were happy to either swap it, refund (as
it was in the refund time) or upgrade.
They hadnt heard of hum from that unit but I didnt want to risk so I
upgraded to the samsung HT-X200R and its just arrived and its tons
better and as a bonus plays my movies straight from my external hard
drive via usb, something the other unit did not even try.