A frustrating audible hum in my setup, please help!

[merrymaid520]

WELL. NOW you tell us. If I understand you correctly, and the input to the Yamaha is not changed (same cable from the P7 to the same input on the Yamaha), then the P7 is bad, or there's a grounding issue "through" it. To be sure, can you sketch up a little diagram of the sources, the P7, the Yamaha and the interconnections?

Sorry
Yes, the buzzing only disappears when a source on the p7 is selected. When it’s in HT bypass meaning my Yamaha is acting as source and going through the P7 is when the buzzing happens. I didn’t mess with any cables.

Hoping the p7 is ok! The buzz only comes through on One speaker. I’ll do my best to create a diagram

[curtis]

Sorry
Yes, the buzzing only disappears when a source on the p7 is selected. When it’s in HT bypass meaning my Yamaha is acting as source and going through the P7 is when the buzzing happens. I didn’t mess with any cables.

Hoping the p7 is ok! The buzz only comes through on One speaker. I’ll do my best to create a diagram

I think you just need to give up and send me your equipment.

For the side that is humming, swap the input cables into the P7 to see if the hum follows the cable.

Also if the P7 is set to HT Bypass, and the Yamaha is off, is the hum still present?

[merrymaid520]

I think you just need to give up and send me your equipment.

For the side that is humming, swap the input cables into the P7 to see if the hum follows the cable.

Also if the P7 is set to HT Bypass, and the Yamaha is off, is the hum still present?

You dont want a buzzing preamp do you

I will try this when I return home and report back.

[merrymaid520]

I think you just need to give up and send me your equipment.

For the side that is humming, swap the input cables into the P7 to see if the hum follows the cable.

Also if the P7 is set to HT Bypass, and the Yamaha is off, is the hum still present?

So I swapped the preouts from the Yamaha into the P7 and the hum doesn’t seem to change much if at all. I also turned off the Yamaha while the leaving everything else on and p7 in HT bypass and hum still exists, no change.
Once I unplug those interconnects coming out of the Yamaha into the p7, the hum disappears.

[merrymaid520]

So I think I fixed it! The Parasound A21 amp has two options for Input, balanced and unbalanced connections. I removed my balanced XLR cables from it and the p7, and replaced the pair with good old RCA cables, flipped the switch on back of the A21 and guess what, the buzz is nearly inaudible!!

I have no clue why this fixed it but so far so good

[curtis]

So I think I fixed it! The Parasound A21 amp has two options for Input, balanced and unbalanced connections. I removed my balanced XLR cables from it and the p7, and replaced the pair with good old RCA cables, flipped the switch on back of the A21 and guess what, the buzz is nearly inaudible!!

I have no clue why this fixed it but so far so good

That's good, but it does seem like there is a problem somewhere.

[jimb]

Something not good with the XLR cables, maybe.

[merrymaid520]

Something not good with the XLR cables, maybe.

Might be! They are just basic XLR cables, nothing fancy.

[merrymaid520]

That's good, but it does seem like there is a problem somewhere.

It could be a bad cable perhaps? I guess as long as the issue (buzz) is gone, I am happy with that! I will be doing a first floor remodel this spring so the entire setup will be packed up and moved out for a bit. Maybe upon its return, the problem will cease to exist.