Help with sub 12 setup. Getting hum/feedback

[tommiwan]

I need some help setting up my sub 12. I've had it for a few months now, but never got the settings right where I want them. I get the gain set right where I want it, but when I turn my system off I get feedback problems. It starts as a real low, quiet feedback and gets louder and then stay constant until I go turn the gain down on the sub. It's got to be something wrong with my setup.

My initial thought was the auto/on switch. I checked and it's set to auto, so the sub should be turning itself off when I turn my system off. I'll run down my settings in case that is helpful. I know this is probably simple but I haven't been able to figure it out yet. One other thing that I thought was wierd is that if I drop something on the floor and stomp, you can hear the sub give off a low ring. Sounds like it's definitely not turning itself off, but why not...

Gain = 50% approx

Lowpass = 100 Approx

Phase = 0

Sub cable from my reciever plugged in to left/LFE, and speaker wire running through my high level in/out

[sivadselim]

Is it feedback or HUM?

Why do you have it connected simultaneously to BOTH a low-level connection AND a high-level connection?

[tommiwan]

It would be more of a hum... but I do have both the low and high level inputs hooked up. I thought that's how it was supposed to be hooked up

Supposing that's the problem I'd like to understand the difference between and advantages of each connection.

EDIT: As a quick test I unplugged the low level input to see if the problem continued and it did still happen

[CECAA850]

Remove the speaker wires and use only the RCA hookup. If the hum is not completely gone, try a cheater plug to see if it is a ground loop. A cheater plug is one of those adapters you put on the end of your subwoofer's power cord. It has a 3 prong female end and 2 prongs (no ground) where it goes into the recepticle.

[tommiwan]

Thanks for the help, I unattached the speaker wire, and the problem seems to be gone. I guess things tend to work right when you hook them up correctly huh? [:$] The good thing is, that in fixing this I got to change a couple settings on my reciever at the same time.

thanks for the help. Now I just have to find the right level... you know the one that shakes the walls, but is just shy of cracking the windows []