Sub won't stop humming! Help!

[Aucosticraft]

I too found the same problem with a friend of mine an some others too. Based on my past experience on this I would suggest you.
1) Add a resistor of 10k between the ground and output. ( you can cut a cable and try this).
2) If its a two pin power-supply try inverting the pin in socket.
3) measure the voltage between the two grounds.
4) design your own simple unity gain buffer using NE3332,and add it between Sub and receiver.

[epa]

Originally Posted by kdixon1029

I know this isn't the clearesr of pictures. The first output is the sub pre out. The solder looks pretty good at least to my novice eyes. It looks as good as all of the other joints. What exactly am I looking for? As I stated earlier the HTS20 sub will hum as soon as I connect an rca cable, without hooking to the receiver. When I push in on the cables the humming stops. The smaller sub that I have, when hooked up works fine for a little while then the same loud hum reappears. When I shift the cables around the humming with stop for a little while.

dunno if u tried yet ,but have you disconneted earth from the mains 1 or both sides?

[kdixon1029]

ok, excuse my ignorace on electronics, but I may need a little more advice on locating the grounds on the mains. Is this the ground in the picture that I've attached? Also this is the only clip like this that I have found.

[epa]

Originally Posted by kdixon1029

ok, excuse my ignorace on electronics, but I may need a little more advice on locating the grounds on the mains. Is this the ground in the picture that I've attached? Also this is the only clip like this that I have found.

i mean the mains ,the wall socket ac 230/110

[kdixon1029]

See, there's the ignorance I spoke about! I'll give it a shot

[richie00boy]

Only use it as a temporary test as it's dangerous not to have it protectively earthed.

[kdixon1029]

The plug from the receiver is a two prong plug as is the plug on the sub? should I get a 3 prong adapter?

[epa]

ok
u can try to borrow a d.i. box(google it)music shop.
this fisicly decouples the earth from 2 devices ,bit puts the signal tru.
u could borrow one of me but we are a bit far appart

[richie00boy]

2 prong plugs, ok quick and easy test then. Disconnect everything from the receiver except the sub. Now does the sub still hum? Is the sub plugged into the same wall outlet?

[kjasey]

If all else fails, simply use the high level inputs on the back of your sub-plate. Some people may disagree but this is the best way to get more out of your sub. You wont go back to low level inputs if you do this right.