How would you know if you had one? Does the speaker hum?
Can you provide more info on what is going on and with which speaker?
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."
well, I thought that I had a typical ground loop at 60 Hz. Don't ask me how I know it's 60 Hz, I just do. Anywho, I bought a Jensen transformer for $50 which supposedly could fix it, because MUCH of the problem seemed to come from the cable box (has hardrive in it DVR). In other words, if I unplugged the cable coaxial and the problem went away mostly, so the Jensen seemed like a no-brainer. the Outlaw 7500 I use powers all the fronts and bi-amps the LSi15's (the 7500 is a 5 channel 300 watt 4 ohms).I have an outlaw 2200 mono amp that powered the LSi9 rears. The rears never had the hum. Swtiching power sources of the amps never changed anything. The symptom was that when DVD (for example) was selected but no source played, you could put your ear next to the drivers (tweeter too) of all of the fronts and hear the hum. I tried everything I could think of including help from the Outlaw forum:
In the end, I simply used the 2200 mono blocks to power the LSi15's (obviously no bi-amping) and not the only thing you hear out of the LSi15's is a hiss from the tweeter . . . different from a hum. the 7500 is still assigned to the LSiC and the LSi9 rears (where the hum has now emerged).
The hum is a low level hum which does not increase in volume. My concern is that the "hum" takes away from the accuracy of the music if it is also trying to play this "hum."
But I feel like the culprit is REALLY the cable box. If I unplugg its power cord completly, the sound still exists, but it I unplugg the cloaxial the problem DOES go away. This is why #1 I am baffled the Jensen doesn't work and #2 that somehow the 2200's are doing a better job of "shielding" the channels.
Is your cable connection on the outside of your house grounded to your electrical service? If not, it should be. Just a thought.
I don't believe it is, but it is unclear how this would be. Do you mean the metal rod in my basement should somehow be connected to one of the ground screws on the splitters?Originally Posted by wirebill
The metal rod that you are talking about is most likely the ground rod.The cable system should be grounded to your electric service. you can run a wire from the cable spliter and connect it to the ground rod clamp.The cable spliter should have a ground screw on it. I don't know that it will solve your hum problem but there is a good chance that it will.
Out of left field but maybe trying something like a Belkin Pure AV product to "filter" out the nasties may help too? Just a suggestion.
Regards - Gaz from the land of Oz
Emotiva MPS-2 7 Channel Amp (driving all LSi's)
Emotiva XPA-2 (driving RTiA9s)
Cambridge Audio Azur 851C / 850E / 752-BD
Polk Audio Cherry LSi9s - LSiC - Cherry LSi7s - PSW505 - RTiA9s
Panasonic TH-P60UT50A 60' 3D Plasma
Foxtel Digital HD+
Belkin - Pure AV PF40
Polk Audio SurroundBAR - PSW250
Fujitsu P42HHS10W/P42HHS10A 42' HD Plasma - HD STB
"I already own and use the Monster Ht2000 MKII."
You may want to try connecting the cable directly into the cable box without going through the monster filter. I have heard of them sometimes creating noise.
Sometimes these things create problems in the signal. Not saying that power conditioners are useless, they have a purpose, but sometimes they can create problems (first hand experience).Originally Posted by wirebill
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it was already set up that way (bypassing the conditioner). in fact, since the run from the monster to the cable box was a short one I decided I wouldn't skimp out on that one and use a Comcast cable (when it originally went through the Monster). So, I went to Tweeter and bought a very expensive one. Would you believe it caused more noise than the Comcast one??!!!! I think I may have a bad cable. Ok, but what gets me is why the mono blocks (2200) seem to be able to handle that better than the 7500 made by the same company (see my sig)???Originally Posted by wirebill
I think at this point I would try calling the cable company and see if they can help, but I wouldn't count on it.
I'm running out of ideas.
Have you tried a 3-prong to 2-prong adapter (cheater plug) for your amps? This approach lifts the earth ground, so do so at your own risk. However, it can reduce ground loop hum significantly though, and is a cheap experiment.
A combination of this and a cable isolation transformer eliminated 90% of my hum (barely audible).
Outlaw LFM-1 Sub
Polk Monitor 7C (secondary location)
Pioneer Elite VSX-45TX
Audiosource Amp Three (2), Amp One/A (1)
Cambridge Audio C500 Preamp
Sony 222ES CD/SACD
MSB Nelson Link III DAC with P1000 Power Supply, Music Hall DAC 25.2
JVC DLA-HD250 Projector
Da-Lite HCCV - 100" Permwall 16:9
Time Warner HD Cable
Panamax 500 DBS
MIT, Blue Jeans, AR, Outlaw Cables
that might be an idea. But I just know that Comcast ain't gonna lift a finger to kill a hum. But, I may be able to get them to give me better cable cut to length, because much of the cable I have is too long and therefore wound up, which may aggravating the problem. the 3 to 2 prong apprach may be a last case scenario thing, but I never heard of it before.Originally Posted by adam2434
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