Tweakers' Asylum

RE: Here's what's REALLY funny: 1 Lb of Chrysoprase rocks is $8.75 on eBay, with free shipping.

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SETguy

In Reply to: RE: Here's what's REALLY funny: 1 Lb of Chrysoprase rocks is $8.75 on eBay, with free shipping. posted by carcass93 on July 12, 2015 at 15:39:11

For my own enlightenment, have you evaluated the crystals with blind listening tests? I always find that to be a useful method with which I look for consistency of identification over multiple trials.

Follow Ups:

No - I only find blind testing useful under very narrow set of circumstances. - carcass93 14:32:07 07/13/15 (2)
Namely, when sighted listening reveals that differences can NOT be heard reliably.

Last time I engaged in blind testing was when evaluating effects of linear vs. switching power supplies for a CD ripper, used to produce WAV files. The experiment was inspired by a lengthy thread at another forum - you can find this in PC Audio forum archives here, if curious.

Such uncertainty is not the case here, with crystals. If you're concerned with removing various expectation biases, then again - these rocks cost nothing, and if anything, tubes look better WITHOUT those greenish-gray ugly pieces on top of them.
- By the same token,... - Lew 07:27:16 07/14/15 (1)
  have you tried using non-crystalline "rocks" of similar size and density, as a comparator to determine whether what you are hearing is due to an effect dependent upon crystal structure vs the dampening effect that any objects of similar size and mass might have on tube microphonics?
  - The fact that various crystalline rocks, of similar size, affect sound differently..... - carcass93 08:51:19 07/14/15 (0)
    ... is good enough for me, as far as the proof that it's not dampening effect that's at play here.

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