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In Reply to: Isolation posted by lipmanl on May 4, 2007 at 10:44:32:
this thread brings up a few questions.can digitally recorded vinyl equal or surpass direct vinyl performance regardless of method of recording?
not in my experience....and the digital is not really very close.
with the right tt; is acoustic resonance a problem?
i can't say for sure since i have never had my tt in another room. my guess is that it's a very small issue in reality for me in my room. the room is large and my tt is on the side of the room near the wall (see pictures on my system page).
the design of my tt's stand vitually eliminates floor resonance; and the mass of the plinth and platter would likely reduce to insignificance any airborn effect on them. how much effect might air-born acoustic resonance have on my arm and cartridge? the arm is a linear tracker with a very solid mounting bracket.....and the surface of the arm and cartridge is very 'spare'......it seems that there would be only a very slight effect.
i think any purely airborn feedback would be so low in the noise floor as to be barely audible.
in practice; one of the outstanding aspects of my tt's performance is how music played at 'warp 9' holds together so solidly and with such ease. an area where digital simply loses it's coherence on the peaks where the density of the data taxes the limits of digital.
and John; if you are still 'game' you need to come out to visit myself and Ki.....so we can settle a few of these questions.
Follow Ups:
During a very quiet passage, between tracks, or with the stylus just sitting in the groove of a non-turning record, a CD-R made while you are "talking" to the record can pick up your voice. The record surface can act as a microphone. That's one reason TT mats can make a difference. Of course, if you whisper sweet nothings, your TT probably won't pick it up, but a normal speaking voice will generally be recorded. I don't know, though, if a vacuum hold-down will prevent this.Of course, the level is low, so this type of direct feedback may not be important in actual listening. But it is there. As for CD-Rs not fully capturing what is on a vinyl recording, I and others have had a different experience from yours. When I synch up a CD-R copy of a vinyl record with the original and play them back blind, sometimes people can distinguish that there two different sources, sometimes not. But even when they can tell them apart, they are extremely close and they are as likely to prefer the CD-R as the original vinyl. I did this not long ago with an excellent Sinatra record that I copied for my wife. After careful listening she finally could distinguish between the two, but didn't know which was which. She slightly preferred the CD-R because she said it sounded more real, like he was in the room.
Like John said it is a open loop. Once it starts it can cause your cartridge to go hopping violently. It just feeds upon itself. You literally run to the preamp to turn the volume down. You just have to learn how to decouple things to solve the problem.
impression that the source of virbations were only airborne, the solution didn't involve relocating the TT or anything to specifically target airborne vibrations.
No Guru, No Method, No Teacher
no doubt airborn vibration can be a big deal......but not in every case.if one has not resolved floor born vibration (not just from the music feedback) how can one isolate the effect of air born vibration?
IMHO floor, rack and a tt's own inherent resonance are dramatically more significant than the effect of airborn vibrations. once those things are solved (however difficult or spendy) Lp performance is a wonder.
I had that problem when (really!) blasting... eventually, after a few also-rans, I hit upon an isolation solution.Interestingly when in that state I placed my hand on top of my 100lbs (each!) speaker... it literally felt like it was jumping off the gound. Glad that problem is behind.
No Guru, No Method, No Teacher
> and John; if you are still 'game' you need to come out to visit
> myself and Ki.....so we can settle a few of these questions.I've been 'game' since April 24, 2006. I'm still waiting for you to send me an airline ticket.
John Elison
i figured you would remind me.....and i'm ready. i will e-mail you with some dates and stuff.it will be fun.
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