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
I have been to older audio friends homes where their children have left. (yeah right - will believe it when it happens to me) ......anyway.

So the couple, find themselves with an empty bedroom/s upstairs; Usually (She) doesn’t want the stereo on the main floor. So usually (He) is forced to use one of the bedrooms upstairs. All wood suspended floors have the capability to produce what I call the 6 O’Clock train effect as bass and volume increases. And the higher you go 1-2-3 suspended floors, the worse the effect can get.

All it takes is one of the full range speakers and or sub to be placed above one of the same horizontal beams, as the one the turntable stand sits on. They become joined at the hip - so to speak. As the volume increases, its like that 6 O clock train going by. A suspended floor is never an ideal spot for a resolving turntable. If the problem is bad enough and keeping you from enjoying your system at those levels that get the .....endorphins flowing..... then...

locate the nearest main side wall that supports the house. Not that flimsy wood studded wall between rooms. Attach a shelf/ves to one of the main support walls. Another option - a little more extreme.... is to hang the shelf from the ceiling. 8^0

**************

then there is the other fellow, same suspended floors, that puts all the gear in one room except the speakers. The speakers go in the room next door.
But guess what - they are still sharing the same horizontal wood beam - so - still joined at the hip ...... guess what happens....

thats right ..choooo. choooo !! some Sat morning funny
ct0517,

I think we are on the same page. This has been my personal experience.

I hope we hear from the OP? It is now up to him.

Happy listening.
Probably feedback, just do some good isolating on the turntable.
Get rid of the low pass filter. Do not use it as it changes polarity and you loose micro-details, micro-dynamics, and imaging.
Some woofer pumping will be present as a good preamp will have frequency response near DC.
perazzi28
Some woofer pumping will be present as a good preamp will have frequency response near DC.
This is mistaken. If the cartridge is properly matched to the arm, and if the rest of the phone system is properly set up, there should be no woofer pumping at all. Absolutely none. 

@bdp24, @toddverrone,

FIM made a ball n" cup device as well that was priced lower than the Symposium jr. Maybe still in production???

I almost offered one of my Symposium jr. sets up for sale, thought about it and decided to keep.

They were offered w/ two levels of ball bearings, one of harder strength. (Tungsten)??

I took it one level further and acquired ceramic balls. My project at this time was my VPI HW-19 mk IV that i"d taken way out of stock.

The ceramic ball bearings were a step up in this particular setting, adding major transparency... the highly resonant plinth/base of the VPI was HARD to overcome!