[Sodacose]

Well I just bought a new Infinity PS-8 subwoofer to help out the bass on my new MB Quart QL 204 C Bookshelves. Unfortunately, I have just noticed that when I turn up the volume to about half of max on my Sony STR-D611 receiver, the subwoofer starts to hum. The hum kind of reminds me of the kind you can get on a guitar when you leave the strings open and turn up the volume (the volume of the amp vibrates the strings, making them resonate). I've noticed this on my Technics SL-D2 turntable.

Right now the sub is on speaker level input and the bookshelves are connected through the sub. If it helps, the bookshelves are 4 ohms.

Thanks for the help!

edit: I just noticed that it doesn't hum when I play music from my computer: only the tt.

edit2: hmm, it seems that what I thought was only coming from the sub is coming from all the speakers. If I touch the tt connects where they connect to the receiver the humming sometimes stops. Is this a problem with the connects not being grounded or something like that? Could their sheilding be gone?

 

[Sodacose]

if an admin wants to move this to "source components" that's fine, seeing as it is kind of a turntable question (because that is what is causing the problem)

 

[lini]

Is your tt grounded - i.e. is the grounding litz connected to your receiver?

Greetings from Hannover!

Manfred / lini

 

[Sovkiller]

I think that it is exactly that, a feedback noise, from the cartridge, try to separate them further, magentic cartridges get "cranky" while you crank the volume up too much, or it could be also any grounding problem...

 

[ooheadsoo]

Sounds like subsonic (or near subsonic) vibration from your tt. Might need a filter or better vibration isolation for your tt.

 

[jaw5]

just chekin to see if this darn website will let me make a post here..........

seems like i couldn't make one in this other discussion i tried.. sure hope the administrators would look into this............. oh well its too late anyways as the item i was tryin to buy have been sold already...............

 

[Sodacose]

okay fixed it! darn I'm gald it wasn't a major problem. I ended up just moving the bookshelf speaker near the tt about a half inch and the humming all of a sudden just stopped. i have no idea what was causing it. I'm guessing it had something to do with the magnet in the driver or something. pretty weird.

Thanks for the help!

 

[ooheadsoo]

Nice.