Amped speakers buzz when HDMI plugged into TV?!

Lietuvis91

So I setup my 5.1 system with my front m70s amped by the 1500a, and got this buzzing or humming sound when playing anything through those speakers. I began to disconnect things, one by one, and found that the buzzing is caused by the hdmi cable being connected from the receiver to the tv. Buzzed when connected, buzzing gone when not connected. I tried difference hdmi cables and different hdmi ports on the TV, no cure...

It's not he amp either, becuase both of my amps (1500a and 1000a) do the same thing.

any ideas?! I'm a little lost...

EndersShadow

Lietuvis91 wrote: »

any ideas?! I'm a little lost...

Try to keep your cables seperated from each other and not touching.

Speaker wires cables shouldnt touch HDMI, Component or Interconnect cables from my understand as they can cause noise issues similar to what your hearing.

It was a bit of a PITA but all my video cables (HDMI, component, S-video), ethernet cables and interconnects run through different cutouts in my setup and never come in contact with each other. The speaker cables also never contact anything other than other speaker cables.

If I am incorrect on this please correct me, but I would try keeping the video and audio signal cables apart to see if that fixes it.

BeefJerky

Do you have a cable line plugged into your TV? Or a cable box plugged into your TV? If so, try disconnecting the cable line. My bet is that you have the all too common ground loop issue due to different grounds on the cable line versus the power line.

Lietuvis91

EndersShadow wrote: »

Try to keep your cables seperated from each other and not touching.

You know, this was my first thought too, and I isolated speaker wires, power cables and hdmi cable to make sure NOTHING touches... made no difference. Good thought though.

BeefJerky wrote: »

Do you have a cable line plugged into your TV? Or a cable box plugged into your TV? If so, try disconnecting the cable line. My bet is that you have the all too common ground loop issue due to different grounds on the cable line versus the power line.

Hmmm... this sounds very plausable, you might have something there bud. I will try to play around with the cable box, as I do have one plugged into the tv via hdmi. In fact the cable box is the only difference (now that I think about it) between this same setup that I ran in my room (without problems) and now in the livig room (with this buzz issue)

I will try disconnecting the cable box when I get home. Can you elaborate a little more on this "ground loop" issue. What is this exactly and what is it caused by?

jaritta

I had this issue with my sepereate amp, when i unplugged my coax from the wall the buzz disapeared. The way i understand the issue is the cable co. didnt ground the cable as well as they should.

What i did to take care of the problem....I ran the coax through my power strip (the strip had coax in and out) This took care of the problem, given you have a strip that has coax in and out and the plug in your wall has a properly connected ground. Therefore grounding the coax

Lietuvis91

Well, turns out you guys were right. The issue is the coax cable. Fortunately for me my power strip does have a coax input so I corrected the issue that way. Thanks everyone!

doctorcilantro

Nice. I picked up a small coax isolator on Amazon a years back which worked well. Glad to hear you fixed the problem.

zingo

Coax from cable does it on my system as well, so I've been running optical from the cable box to my DAC. Ground loops and cable are too common a problem and there is nothing in it for the cable company if they fix it either...