Originally posted by: alee25
but if it was signal interference, would it make sense that there is no buzzing once windows starts up , only when the computer is off or right at the begging of when it restarts does it buzz
A little Googling shows you're not alone with the Klipsch speaker buzz issue. Here's Klipsch themselves talking about sub-woofer buzzing:
POWERED SUBWOOFERS
Experiencing a Humming/Buzzing Noise?
This could be a ground loop hum/buzz or possibly a transformer hum through the speakers. In fact, large subwoofer transformers are more susceptible to a slight hum noise.
A speaker hum at your listening location is never normal. To determine if the sub amp is functioning correctly, the best thing to do is disconnect all of the connection inputs going into the subwoofer. Keeping the subwoofer plugged into the AC outlet, turn it on, and if the hum still exists, then there is either a connection problem somewhere or there is a problem in the sub amplifier and the amp should be serviced or replaced. If there is no hum at that point, the issue may involve the preamp, another source component or you have a ground loop hum. Some common culprits of a ground loop hum are cable TV connections, digital recorders or satellite dish receivers.
Some hum issues are even caused by a half-wave device that?s interfering with the AC line that runs inside and outside of your home. In fact, the culprit could be something that is plugged into the same AC outlet as the sub amp. For starters, turn off the AC breaker that will shut off the AC outlet to the sub amp. Next, check to see what else is now off and then unplug everything that was off. Lastly, turn the breaker back on and then plug each item back in one at a time checking for the reoccurrence of the hum. Most common devices include: clock radios, plug-in air fresheners, lighting dimmers, coffee makers (automatic types with plate heaters).
If the hum issue is found to be with a cable TV coax wire, then possibly a device called a MAGIC box may help eliminate the ground loop from Cable TV, or an OTA antenna.
Speaker hum and transformer hum, are almost never related. A physical transformer hum is normal in sub amplifiers with transformers of this size, but it should not be excessive. How loud is it? Are you placing your ear up to the sub to hear it? If so, this may be a normal transformer hum.
More than likely, a power conditioner will do nothing to eliminate such issues. If you look at the size of the power supply in the power conditioner, versus the size of the power supply in the sub amplifier, the sub amp supply will more than likely dwarf the conditioners in size. Due to that fact, there is little effect the conditioner can have on a sub power amp other than limiting the power the sub amp gets.