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Feedback through turntable

My system consists of a McIntosh C2300 preamp, MC452 amp, MCD500 SACD player, VPI Aries 3D with Ortofon Cadenza MC cartridge, Manley ChinookSE phono stage, PS Audio P5, Sonus faber Cremona Auditor M speakers and REL B1 Sub bass system.  My issue is with turntable use only; SACD has no issues.  On my pre when volume is +55 (peak at 45watts) I start to get feedback through the turntable - a sort of low freq sound, back off volume and it goes away.  My Auditor M speaker is about 3 ft away and in front of turntable.  I do have a rumble filter (KAB) installed between preamp and phonostage to help with sub woofer pumping.  Due to room layout I cannot rearrange the setup/move turntable.  My turntable is on a 2.5" block of wood and that sits on 4 isolation blocks via spiked feet.  Any thoughts how I can eliminate this problem?  Harry Weisfeld with VPI states he has 4 15" woofers (JBL Everest) near his Prime Signature setup with no issues at all.  Why am I having this problem and how can I eliminate it?  Thank you in advance for all feedback.
miner42
raymonda
847 posts
 
Well, as I suggested early on, the best way to minimize your feedback problem was to relocate your table.

Whatever you do, don't put your table in the corner. That too can cause issues.

raymonda
847 posts
 
Often times when you have feedback issues it can be a combination of both mechanical and air born problems. Keep fighting and refining solution to both and I think you will eventually solve your problem.
slaw's avatar
slaw
5,785 posts
 
handymann,

Yes, room treatments do wonders in providing excellent bass response while also taming bass room nodes.

toddveronne,

Sorry. I guess the lack of the OP responding got my juices flowing..

Your thanks to the OP, while relevant, are ultimately misplaced. The thanks for the gain you've achieved through the OP's posting should go to all who have provided the info.

Your use of three springs, "too wobbly when I tested it". What/how did this translate into the sound???

miner42,

You never responded as to your "audio console". When I read that term, I envision an enclosed structure? Given all of the problems you need to overcome, IMO, having an enclosed audio console in the center of your speakers on a second floor is quite a lot to overcome? I do realize it's not relevant now?

Given the changes you've made, I'd say it's time for some quality bass control. I've had great success with the Vicoustic Extreme Bass Panels.

"Woofer pumping during tt usage", again a sign of the tt isolation being ineffective.

slaw's avatar
slaw
5,785 posts
 
toddverrone,

I read on another thread about your using wooded balls under your Rega after I posted on this thread. I may have gotten the time line wrong. If so, my apologies.
slaw's avatar
slaw
5,785 posts
 
"too wobbly".....

I have my 2 tier audio rack that I use for my 50lb. amp and my Hydra, along with my maple platforms, BRD shelves... lots of weight.... between my speakers in my small listening room.

My bottom maple platform (3") is coupled to my suspended floor by 3 carpet piercing brass feet screwed directly into this platform. Above it are four SUPER STIFF SPRINGS into another maple platform (1 & 1/2") thick.

My rack and components sit on top of this. When I walk by, I can see the whole (thing) move. The components, however, are isolated. The sound I heard after doing this was/is transformative!. Wobbly? It can be a good thing.

"too wobbly" doesn't address how this sounded in your set-up.
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