KSW200 Hum

[turbo]

I have the same problem with Hum, not ground loop,

for a KSW200 that "Ohricky" had.

(this forum

http://216.37.9.58/ubb/Forum2/HTML/000292.html )

Did eventually take the amp out to

check the wiring. Found out that the high-in was

tie wrapped to the AC-in with no shielding, so did

what was obvious and recommended as a fix by BobG in

the above thread -- separating the power from the audio. This did not fix the hum.

Also, disconnected the high-in from the pre-amp

although the hum remained.

Also looks like there's some wiring from the preamp

to the amp with those wires tied together with power

that lights up the LED. Is it worth-it to pull

the whole thing apart to separate ALL power wiring

from audio? Any other ideas on how to rid this sub

of the hum.

Tom

[Colin]

I could not get the KSW200 amplifier box on the back of my mid-bass sub-woofer open, stripped one of the tight screw heads, but in the process I plugged the KSW200 into another socket and the UPS onto another socket, though both of them are on the same outlet. Result? Hum reduced significantly - so far.

[Bill Paradise]

I had the same hum problem. The solution is to isolate the ground prong on the power cable. I use an adapter that connects only the 2 power plugs or you could just cut off the ground prong. The hum will be completely gone.

I've read that some of the ksw200's even shipped with a power adapter.

Bill Paradise

[mike stehr]

Is there a possibility of getting zapped by

floating the ground?

If you were to touch exposed metal parts of

the amplifier?

THANX!

[Colin]

the cheater plug on various sockets or outlets did little to reduce my pernicious hum, although I know that it can work ...

------------------

Colin's Music System Cornwall 1s & Klipsch subs; lights out & tubes glowing!

[turbo]

This is a bit more than the regular "hum busting"

tricks I'm coming to believe. The Klipsch did in

fact ship with a 3 to 2 plug, although that didn't resolve the issue in this case.

The next possibility could have been shielding, like

hot AC running parallel to the audio cables. Sometimes,

you can cross them at 90 degree angles which minimizes

tha magnetic interference. I disconnected all inputs

and outputs (outside the box..regular connectors) and

the hum remained, so I then went inside the box to

check it further.

What I mentioned above is that the hot ac was tie

wrapped to the high-in audio cables. Those, I un-

bundeled and separated. There is also another audio

connect from the internal pre-amp waferboard to the

main amp board (with the big heatsink). The hum also

remained once I did that, so I'm assuming there's an

issue somewhere on the main amp board. This is getting

real technical, either a design flaw or bad module, etc

on the amp, I think.

Appreciate everyone's input on this..happy new year.

Tom