Isolation for turntables

I went wild building a wall mount shelf for my P-25.I bought some heavy steel 18"long L brackets and bolted them to 2 2x4's which I then bolted to the wall.The bolts go through the wall to the outside where they are very tightly secured with nuts.On top of the brackets I placed 4 rubber grommets.On top of those a 16"x16" x1" MDF shelf rests and on top of that a Bright Star Audio Big Rock #4.Never had a problem amd the sound improvement was very noticeable.

Hi Jeff, First, you must learn to properly adjust your Delphi's suspension.It is without doubt, the finest spring suspension turnatble evr designed in terms of isolation from outside disturbances.You should be able to host WWF tag team matches in your listening room without missing a beat.When it's done right, the platter will not shimmy or sway at all but rather operate in a pure pistonic motion.You should be able to tap firmly on the clamp and it will settle in 1-2 cycles to an even, slow bounce at 3-5 cycles/sec and die away.Check to see that the tonearm cable is not fouling in any way. second,the best means of siting would be a lightweight,rigid wall support like the Target VW1 or older TT1 and original Sound Organisation wall mounts.Second best would be a similarly principled Target,Standesign or Sound Org floor stand.High mass and heavy weight will store energy and re-release it back into the system as well as energise supsended flooring like a tramopline.You want a low mass design so that vibrations dissipate quickly and thus intrude less into the music.A small amount of blu-tac on the lower portion of the legs is all you need for damping.Avoid sand and lead filling of the legs like the plague as it will slow and muddy the sound.

Thanks for the inputs all. My setup just doesn't allow for a dedicated 'table stand, whether it be floor or wall mounted, just not enough room. Underneath the listening room, in the basement, is an unfinished furnace room. Based on these inputs, I'm thinking of crossbracing the floor joists, and putting in a telescopic steel column directly under the gear. As much as pouring a concrete pillar intrigues me, that may be going a little too far, people think I'm insane as it is when it comes to audio. I agree with Caterham, the 'table should be immune to pretty much anything, I'm fortunate in that I live less than 90 minutes from Oracle, Mr. Riendeau tweaked my Alexandria for me a while back, I think it's time for the Delphi to go in for a tune up. Any isolation base products I should consider as well? I'm using Bright Star bases under my pre and CDP, but doubt they'd be ideal for something as large and as heavy as a Delphi. Thanks again, Jeff

Okay.How about this?Your problem lies with the heavy cabinet, particularly as it is on the supended flooring.If you place 2 small wood blocks or feet at the bottom/rear of the cabinet and then rock it bacwards and attach it to the wall studs, you will have effectively turned it into a wall shelf and placed its mass onto the much more stable building structure rather than the springy flooring. Your next step would be to try a low mass tabletop isolation platform like the Target VF1, RATA(Russ Andrews) Torlyte, Cetech composite or one of the less expensive Symposium platforms(I don't much care for the ultra).These units are amoungst the most stable and musical means of decoupling and PROTECTING your deck from the energy storing, information smearing mass of the cabinet and probably the least intrusive and convenient.The Brightstars would be musical death to your Delphi, IMO. Best, Ken GreaterRanges/Neuance www.neuanceaudio.com/

A thing that works for us(Wifes idea) is to go to the local Hdwe store get some canister corks and place them under the feet. May work, may not, no great investment in time or money