Seeking help with feedback through audio system


I currently use a high mass, direct coupled turntable and have been experiencing some strange "feedback" type issues - I will explain below.

I'd like to know if anyone else has experienced these type of problems and if there is a potential solution.

Situation:
My table sits on a wall shelf (massive & "home made") which connects/integrates with a load bearing wall. I have it set up this way because I have VERY springy hardwood floors which just don't work with any turntable (suspended or non-suspended).

Everything sounds great but at a certain volume level, I begin to hear what I presume to be feedback. It is a steady upper mid-range resonant tone which does not amplify or get louder, it just remains constant until a few seconds after the overall system volume is lowered. The feedback will continue between songs on a record but eventually gets drowned out by the next song and becomes less audible. I can faintly hear the feedback "within" the next song.

When the volume is lowered, the sound is great - with no feedback issues.

I presume this feedback is caused by the interaction between my room and the cartridge (Shelter 901) - which from what I've read may not be a good match for my unipivot tonearm - further complicating or enhancing the problem. I dunno. I did try moving the table to a different location within the room and the same problem occurred when the system was playing at about the same volume - however I think the frequency or tone-of-the-feedback-tone was a bit lower - perhaps mid-bass feedback.

Again, I'd like to know if any of you have experience anything like this and hopefully you've got suggestions on how to alleviate the problem.
bwhite

Showing 2 responses by bornin50

Hi

Apologies if this is a stupid question, but if you lift the arm does the feedback go away?

Regards
Hi again

This should be available on a webcast so we could all hear it and chime in with recommendations.

If your electronics have any tone controls or filters, do they have any effect when the 'sound' is active?

I'm getting a 'subsonic stylus in the groove noise aggravating something in the electronics' type of feeling.

Or maybe I'm just on the wrong medication. :-)