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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: just curious, please explain how you used the CD player to find turntable vibration problems /nt posted by hermanesque on March 28, 2007 at 18:12:20:
I listen to the way the CD player plays through the horns. When everything is hooked up right, the CD is good sounding and it is almost impervious to sonic vibrations coming from the horns.Unfortunately, there's a side effect of these amazing horns. They don't compress any crescendos significantly in terms of dynamic range, and they don't distort in those crescendos appreciably, either. The CD player doesn't care about that issue, it carries on without much affect. So CD sounds undistorted and without vibration feedback effects.
The turntable is subject to the airborn vibrations coming from the sound of the horns. It's a positive feedback loop. With direct radiator speakers or less dynamic speakers, there is actually less impact of this feedback loop than with horns. This is because the compression of crescendos with DR's reduces the gain of the overall feedback loop and you don't get as serious a problem with the vibration control. With horns, the lack of compression in addition to the lowered amount of distorted sound caused it to be very noticeable the problems associated with the vibration feedback control, or the suspension.
With that understanding, it is best to listen to the way the CD player behaves, consider that lack of squealing, clanking, thumping, and shrieking to be "correct". This is then the reference. A good CD player like the Ayre with horns shows how controlled and "correct" this player actually is. There is no artificial "slam", no fake "PRaT", just an open sound with great transparency, for a digital device. So I can then take this and listen to similar recordings on the turntable to tune it to sound as much like the CD player as possible, eliminating the bad vibrations. But after doing this, it will exceed the CD player in sound, because it sounds like there's just more coming from it.
In the process, I also found I can "deaden" the turntable too much with excess dampening. It is heard as an increase in distortion of notes in the time domain, a smearing effect. Now some might call this the "PRaT" killing effect. I don't care what you call it, it is not ideal to trade off time smearing distortion for resonance control of the vibrations. This is why it is hard to engineer a turntable suspension system for something that has no suspension to begin with. My Teres is suspensionless, and something has to be addressed about that. Mass, mass, and more mass did not work as planned. Those highly recommended Mapleshade brass cones did not work well - they made the midrange clang although the bass cleaned up fine.
I now understand the value of engineered suspensions used in turntables like the SME 30. Those do nearly all that work for you, and little has to be done when you find a spot to place it. You pay for that engineering, but they are probably worth it. With low distortion horns, it is tough to deal with if you don't have it, IMO.
Kurt
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Follow Ups
- Like tuning a piano with a tuning fork, sort of. - kurt s 09:05:32 03/29/07 (2)
- Just a suggestion - Charles Hansen 20:06:38 03/29/07 (1)
- Re: Just a suggestion - kurt s 09:11:21 03/30/07 (0)
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