Originally Posted by
alphaGT
All I know is that these mechanical isolation devices work. Mini warps may cause issues, but they would happen no matter the volume. As far as feedback, it increases with volume, both mechanical or airborne. There's not much to be done about airborne feedback, unless you mount your 'table in another room. So combating mechanical feedback leaves you two options, either install a filter in the preamp, or isolate it mechanically. You yourself claim that the side effects of electronic filters make them not a good option, so that leaves us with mechanical isolation.
Low frequency exasperations due to mini warps can be damped at the stylus, or into the platter perhaps? But those things are built into the design of the 'table itself, or cartridge, or tonearm, part of what makes one turntable worth more than another. But that issue is not a feedback issue. And I can speak from personal experience that mechanical isolation devices can make a real difference.
My old setup was so that I couldn't walk across the floor without footfalls causing skipping. And increasing the volume would excite the bass, getting boomier as it got louder. Now I've got a 35lb plinth with cone feet on brass cups, and those problems are greatly reduced. I can reach beyond satisfying volumes and the bass sounds solid and stable.
Don't get me wrong, I don't mean to minimize the problem of these mini warps, as you have eloquently described them. That is yet another problem with vinyl playback that can be addressed. I've been looking at some platter mats, the Achromatic, that are supposed to absorb these bass artifacts, or channel them into the platter.
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