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In Reply to: RE: Floor vibration vs. Airborne sound posted by mr.bear on June 20, 2017 at 12:01:59
Thanks for the reply.
I once used the nuclear opinion you mentioned, speakers in front room, turntable and amp in another. Not super handy, but the kenwood table I used at the time would howl at the sound levels some enjoyed, so a solution was found. It had a resin mixed with stone powder base, but the suspension was up to you. It was replaced, and easily bettered.
I don't have the technical chops to do a lot of productive explorations, unless you want to count on random experiments and dumb luck for your results. So I play follow the leader, reading and selecting methods that seem reasonable. Vibrations and waveform understandings are interesting to me.
I saw the slabs pictured, and thought I should mention I also had some , in case you had attempted to used them in turntable supports.
IN reading, folks say the material, marble, excites too easily, and since you are a guy with resonant frequency equations easily at hand, I figured you might have a successful way to use them . I suppose I could weigh them and figure with the math you provided. PRobably won't happen , the spring deflection would be hard to control, for a DIY result that wouldn't need a lab coat and tongs to play a record.
I once read a story by an audio reviewer, who, in seeking a quit place to listen to music, thought he had found the answer. An old english cottage built over a giant rock, the exposed portion was exploited to use as ledge and hearthstone for the fireplace. He figured the buried rock was at least fifty tons , probably more. The perfect mass isolation platform for his turntable. All he was looking for was a quiet electrical situation out in the country, and figured he got really lucky. Until he bought the place and found that a local rock quarry used the country road, but only at night, so people aren't troubled. The big rock picked up the rumble from the road a mlle and a half away and microphoned it right into his turntable. The guy didn't have many options, this was back in the fifties, hi fi was new, he was building the hobby. .
Follow Ups:
When you eliminate vibration from vinyl playback, the improvement is quite noticeable and very desirable. My most recent vinyl recordings have been made using 5.6-MHz DSD, which is exceedingly accurate and transparent. I monitor my recording sessions with headphones so my speakers remain off. This pretty much eliminates acoustic and mechanical feedback from the recordings. Then, when I play the recordings at high volume through my speakers, the sound quality is awesome. The music sounds noticeably cleaner than playing vinyl directly at high volume.
Best regards,
John Elison
That does seem like the best electrical strategy to fight vibration in playback, separate the signal generators from external excitement. Pretty cool , and clean.
Myself , I would have just grabbed another record and listened to twice as much stuff in the same time. Once the music starts, I have a high tolerance for added dreck , a trick my mind is used too, , having grown up with a consul changer in the front room , full of 78's and the playback needle that god gave you, why would you ever need to get a new one? Plus, it could flip over to 33 1/3.
Your first statement about vibration in vinyl is so very true, and hit me hard when I got a quieter table. All of a sudden stuff was flying around the room with some rock records I had owned from adolescence . The soundstage was an entirely different illusion, going from speakers are not evident , to, I can listen to directions in the hall, if an instrumental section or solo catches my attention.
Makes it easy to understand why there is a market for super turntables the size of an arm chair, with cost like scientific equipment. Not that I would ever need or want one, but I can see the game from my cheap seats, finally, as I assembled stuff over time.
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