Suspension vs. non-suspension turntables???

Your Xerxes must be a suspended table based on your wall mounting. Before spending any additional money on a turntable I'd suggest you locate your turntable on a light weight but rigid stand between and slighly behind your speakers. A good, tight, old end table would be just about perfect for this. Drill some holes in the bottom of the legs and install some threaded inserts. Make or buy some spikes for the inserts and level the stand. Not against a wall as frequencies are reinforced along walls and in corners. A reasonably capable suspension is tuned to below 8 Hz and shouldn't be affected by your subwoofer. If you get any feedback it may be more a function of the arm or cartridge than the suspension. My only suggestion would then be to spend enough money to do it right either way. I really don't think there is a best design unless you take into consideration new/used at various price points. My suspended table has been in my posession for well over 25 years AND I've had non-suspended tables selling for multiples of it's cost sitting right next to it for an A/B comparrison. I've still got the old table as there has been no compelling reason to buy anything else unless I hit the jackpot and go the cost-no-object route in which case I'd buy a Walker. Not to slam subwoofers but they do seem to be problematic and not with just turntables.

The concrete floor suggests to me that a floor standing rack would work well. My guess is that the drywall is picking up the bass and feeding it into the wall rack.

A very cheap setup for isolating my rega is a sheet of soft polyurethane foam, about 2-3 inches thick, with a large paving slab (or marble sheet if visuals are important) sat on top of it, with the rega sitting on the top.

I have not noticed any bass feedback from my subwoofer, and my spirit level says the deck is very level (the mass of the deck is much less than the concrete slab so levelling was easy). My floor is a wooden suspended floor, and the subwoofer is only a couple of feet from the Rega.

Of course the weight of this setup means it has to be on a cabinet, rather than a shelf, but it costs so little to try (about $10-$20) that it might be worth playing with before getting a new deck.

That is, unless you really want a new deck. Buying a new deck is much more fun than buying paving slabs :-). Until the credit card statement arrives :-(

David,
It would have come out much sooner, but I can't see the T, E, R and S keys as easily anymore.

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The ink's worn off them!

Gotta run, we're drilling our armboard and mounting the new Triplanar tonight. Yummy!

Esoxhntr,
As you said, there's not much point mounting to wood studs when you have bedrock available. I'd plan on getting a good stand, but I wouldn't decide until I was sure what table was going on it. Different tables like different stands.

Dan can probably tell you what a Basis prefers.

A Teres/Redpoint/Galibier prefers a big hunk o' mass, bolt it to that floor if you can.

A Spacedeck like 4yanx's prefers... like... um... levitation? It's a California thing!!!!!!!!!

Dougdeacon,

I still have it on my todo list to get down your way for a listen. I'm helping my son and his girl friend move back up from New Jersey next month. We usually travel the Merritt Pkwy so it wouldn't be too much of a detour. I'll give you plenty of warning if I can make it happen. Hey, the cows are pretty good neighbors. They don't complain when I crank up the music and I don't complain when they bawl at 3 a.m.

Esoxhntr,

Where is your table in relation to the subs? I'm wondering if the problem may be airborne vibrations. My 10t's pack a hefty bass slam but I haven't noticed any issues with my tables. They sit to the left of the speakers, but farther down the wall from the first reflection point.

Also I am wondering if the studs in your basement are even in contact with the concrete walls. My basement is very much the same with the three concrete walls and the forth is framed as it is a walkout. We framed it 3 inches inside the concrete walls to keep moisture from wicking into the studs and insulation. You may also want to check how the walls are fastened at the top. If they just nail to the joists then there is no load to help damp things. Your wall stand may work better on the outside, load bearing wall. Just another guess.