[/mp]

Whoops! Meant to add Pre's subsonic filter better than naught but probably wholly inadequate if one can see feedback loop grossly affecting speaker cones.

/mp

[cheap-Jack]

Hi.

The center is disconnected as is the AVR, only using a 2CH amp currently,

how sensitive the glass stand it sits on now, i'm sure that's the bulk of the problem, it's literally a microphone when I tap on the shelf.

I think I will try a stand first and i'm looking at a granite top, about 1-1/4" thick.....just tough choosing a pattern.

Sorry I missed reading yr replied post.

The overall layout is sonically NO good to start with. The large TV 'sandwiched' in between the big louspeakers acts like a solid big wall to stop the music to flow around freely. Acousically a disaster.

Music like human being, needs free moving AIR to breathe.  Ideally, you should move the huge TV away from yr sound system to the other side of the room.

If not, replace yr 10-or-so-year old TV with a super-thin Wi-Fi LED TV, seated on an strongly built LOW profile long WOODEN TV stand - NO glass shelves please!

So you can move all you audio stuffs into the new TV stand. The audio stand you are using is NO good acoustiscally & sonically - being too tall to deflect the soundwaves & glass shelves colour up the music bigtime - FYI, glass resonates at around 800Hz. I'd never use any glass shelves to support my audios.

Place yr big loudspeakers at least 1-2 feet away from the new audio-TV stand.  NEVER let yr loudspeakers stand too close to yr auido stand or anything else.

With such major change & re-location of yr audio-video setup - being acoustically open, I bet you will get much better sound. No more LF resonances.

Also, NEVER play yr TT with the TT lid on. The lid causes vibrations while the TT is running & such vibrations will be picked up by the phono cartridge. I can detect it with a scope. If you want to dust proof yr TT, unhinge the TT lid & take it OUT whenever you play the TT.

c-J

[dkd7]

Thanks for all the help, I found a cheap table and a granite top from 2 different people on CL, while not the best looking, the dimensions of the slab and the table match.  I placed it just in front of the rack about 2-3' from the speakers along the wall, not the most ideal place but good for time being.



So I still need to add a length of RCA cable but I drilled in four 1/4-20 insert nuts and used the spikes from my old pair of speakers to get the stand onto the concrete. Then I used some thin anti-slip pieces under 5 dense foam pads to keep the top from sliding and leveled everything out. Reset all the tonearm adjustments and fired up the same track...results were very positive, all the pumping seems to be gone.

http://www.youtube.com/watch?v=1Pftop-lUnA&feature=youtu.be