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I am looking to add some vibration isolation to my Technics SP-10/Steve Dobbins plinthed TT. For systems that are air based (Vibraplane type), what are the advantages for an active system vs passive besides not needing to refill the unit over time?
I was thinking about either a Thorlabs Isoplate or a DIY system made from 3 Newport Compact Isolators and some sort of mass loading (damped granite perhaps) to get the system close to the load limit. I already have a Nitrogen tank to run the system.
Both are around the same price ($1,000) but the Thorlabs is passive and would need close to 400 pounds load to get it to optimal.
Stillpoints ultras are even more expensive as are some of the non-air based platforms.
Thanks
Follow Ups:
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the picture above shows 2 active isolation platforms; the Herzan TS-140 under the tt, and the TS-150 under the preamp and digital player.a Vibraplane is passive. it's an air bladder. you can have one that has manual leveling, or active leveling. but at the end of the day it's a spring like any other passive isolation. not to say that it's not effective. but any passive isolation will have an unpredictable effect.
the link below is to true active isolation; the Herzan TS Series. Halcyonics also makes a similar product. these active platforms are the latest technology developed mostly for going under an electron microscope. I have 2 in my system; one under my tt, and one under my preamp and digital player. they take decoupling any audio gear to a whole new level of performance.
mikel
Edits: 01/27/15
Have you discussed this with Dobbins? I would guess he knows how his customers have his modded tables set up.
"You can’t know what the “best” is unless you have heard everything, and keep in mind that given individual tastes, there really isn’t any such thing." HP
If you are thinking about a Vibraplane you should call Steve Klein at Sounds of Silence. he is a very nice guy and I am sure would be happy to discuss it with you. I recently bought a Vibraplane and I am very happy with the results as well as the service Steve provided.
The active model requires a compressor, and that made me decide on a passive system. It requires occasional inflation with a hand pump and leveling. It only takes a few minutes every few weeks. You can see photos of my system with Vibraplane under SME 10 turntable on Audiogon under the same user name that I have here at Audio Asylum.
3" thick Maple Block over Raquetballs in furniture cups. Works great here, YMMV.
See ya. Dave
I used a similar approach for years. Very effective as long as the turntable itself has leveling via footers, spikes,etc.
You could make an easy test to find out if isolation is really your problem. You could put your turntable in a different room than your speakers and see if this improves its performance.
Best regards,
John Elison
Moving the TT to another room is not an option due to distance. Steve Dobbins uses Stillpoints on his tables now but I have a hard time swallowing $2500 for feet.
I will probably go the DIY sandbox or racquetball/maple block approach first to see if that makes any difference and then would next go for an air suspension device, either the Thorlabs or the Newport.
John----that is a great suggestion. I put my Turntable, Preamp. and SACD player in an adjacent room. It's kind of a pain in the ass when you have to change records or selections on the SACD player, but the sonic improvement is worth it.
A long gone friend of mine used to put his table, phono stage, and preamp in the walk in closet adjacent to his listening room, leaving the power amps as the only thing one sees (besides the speakers, of course).
Sound was awesome, without ever an issue of feedback, etc. This isolation at a listening level that could only be rivaled by a rock concert PA!
YOW that was a loud system (and it did sound good)...
Dman
Analog Junkie
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