Isolation Ward: RE: Crystals - acoustic pressure reduction or RFI/EMI absorption? by jrlaudio From ebony pucks to magic foil, mystical and controversial tweaks.

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Posted by jrlaudio (P ) on June 25, 2020 at 21:53:53

In Reply to: Crystals - acoustic pressure reduction or RFI/EMI absorption? posted by geoffkait on March 19, 2017 at 17:04:31:

Ok now wait a minute ... if your talking "crystal" in a spiritual sense that's very "west coast" and may only apply there.

However ... (oh dear, I'm going to regret this I know), there is a thing called a crystal-lattice filter which could be applied to create a band-pass filter for audio. Sure ... you could use it to filter EMI/RFI. The problem is they are very difficult to design and manufacture in a way that would be up to so-called "audiophile" quality. Not to mention there are better approaches these days. But this is a very old technique that's been around for decades, used in old radio receivers audio stages. So in that sense ... yeah ... crystals. Heck ... Moog used them in his analog synthesizers, and they still do to this day. Best sounding low-pass filter ever in that world.

Not sure what "acoustic pressure reduction" means. I use my volume knob for that.

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