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In Reply to: theory vs. practice posted by castironandtubes on May 4, 2007 at 15:40:52:
Actually, acoustic feedback is an audible issue in any vinyl system. Most people don't realize it because most people have never heard vinyl without acoustic feedback. I'd be happy to send you a comparison CD with and without acoustic feedback, because the difference is quite significant. Unfortunately, once you hear the difference you might never want to listen to vinyl directly again. ;-)
Follow Ups:
and have, recorded CD-R's of vinyl recorded (with amps off) and compared them with the vinyl playing live. I can tell a difference there, and much prefer the live vinyl (although I'll take the CD-R over a real CD). I have also recorded with amps on and amps off, and I can't tell a difference there.Perhaps your particular TT setup is particularly succeptible, but I would be very surprised if you could hear anything happening at 55 db while music is playing at 105 db.
Actually, the truth of the matter is that I had my CD playing for these feedback spectrum's. Actual feedback from playing an LP is worse because the feedback signal causes a feedback loop that amplifies the results. In other words, the acoustic feedback from an LP returns to the stylus and multiplies the problem. This is an audible problem with all turntables located in the same room with their speakers.Try this experiment. Place your stylus on a stationary record and turn your volume up all the way. Let me know what your hear.
Regarding the sonic difference in my system while playing music, I'll be happy to send you a comparison CD if you like. Send me an email with your address.
"Try this experiment. Place your stylus on a stationary record and turn your volume up all the way. Let me know what your hear."Okay, just did that. With my setup, volume knob at 6 on my Eico pre is listening levels around or just above 100db. I have never listened above 7. With cartridge on a record, I just turned it up to 10 and left it there. Some increased hum, the Eico is not perfect, but not really that much. No feedback whatsoever. Is that what I was supposed to hear?
Yeah, that's good! If you had a significant feedback problem you would have been jumping to turn the volume down.
from system to system, it's fair to say that everyone's experience is not the same as yours, right? And it's conceivable that in practicality for some feedback issues are negligeable, not non-existent but indetectable.
[nt]
thusly picking up a lot of bass. As an alternative you could move it.
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