Moderator: Captain Ned
SecretSquirrel wrote:The behavior sounds quite similar to a ground loop, but since there are no grounds involved here....
LaChupacabra wrote:Something like this (http://www.newegg.com/Product/Product.a ... 6842101349) would get the job done.
Disco wrote:But, now there is a low frequency buzz/hum coming out of my main desktop speakers (good old Cambridge Soundworks speakers) that goes away as soon as I unplug the powerline network.
Yeah, the speakers are presumably plugged into the same circuit as the powerline network tap; it's possible the amp in the speakers is picking up and passing along something from the power side to the signal side. I wonder if just a choke on the speaker power cord would make a difference? I guess the question is: what is the source of the hum: the speaker wires, something else in the signal path, or the speaker power source?Madman wrote:Couldn't it be the inductive current or something?
The speakers usually go nuts when cell phone is about to ring or during the call, and there are no grounds or wires involved.
ludi wrote:What bothers me about the entire scenario is the fact that the problem can disappear on its own after equipment warms up. That almost sounds like a flaky ground connection somewhere in the system...
Are we sure that's what it is, though? Until we know what is picking up the hum and/or where it is originating, I'm not sure we can rule anything out.just brew it! wrote:If it's 60Hz hum a choke isn't going to do squat.
UberGerbil wrote:just brew it! wrote:If it's 60Hz hum a choke isn't going to do squat.
Are we sure that's what it is, though? Until we know what is picking up the hum and/or where it is originating, I'm not sure we can rule anything out.
Disco wrote:I've checked all the jacks, and everything appears to be plugged in nice and tight.
UberGerbil wrote:Are we sure that's what it is, though? Until we know what is picking up the hum and/or where it is originating, I'm not sure we can rule anything out.just brew it! wrote:If it's 60Hz hum a choke isn't going to do squat.
Disco wrote:I've rechecked the various jacks, and found no problems. As I mentioned, it's not a continuous hum. It usually lasts for 15-20 minutes after the speakers have been 'woken' from the inactive state. Sometimes it's a solid 'hum', and other times (yesterday) it was more of a cyclic pulsing buzz ~100 beats/min.
JohnC wrote:Sounds like there's an RF interference from that Trendnet device which is being picked up by your speaker's amp... I have old Klipsch ProMedia speaker setup which can "pick up" the CB radio (or some similar type of portable radio device) if some truck (or some commercial vehicle) is using it near our house (I can actually hear everything and can "amplify" the sound by using volume knob on speakers), maybe something similar is happening with your speakers...
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