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In Reply to: RE: Hi freq drop posted by tanto on October 18, 2007 at 12:56:03
If you have another source (tech) for doing a frequency response check, I would do that, unless your current tech is a "known good guy". Otherwise, he might take offense at you suggesting that he didn't do the job correctly, if you don't have any data to discuss with him.If you can get your hands on a professional test tape, that would be the best way to verify the playback chain. Then you'll have the ability to talk with the tech and say (for example) that it's off by 6 dB at 10KHz.
But as long as you've at least done a little testing of your own and it really does indicate a problem, you've got a better case than just saying it doesn't sound right. It could well be any of the things Richard mentioned (azimuth, bias, etc.).
As a side thought, I would speculate that if the guy did it by ear and he's 80, I would expect the machine to be too bright rather than rolled off. ;)
Good luck!
Edits: 10/19/07Follow Ups: