Mastering Captured Vinyl For CD Reply #25 – 2008-12-05 19:39:58 Quote from: Slipstreem on 2008-12-05 12:19:46Quote from: Arnold B. Krueger on 2008-12-05 11:55:15The two samples still don't have the same frequency response +/- 0.1 dB. Therefore, of course they are going to sound different.Are you seriously saying that the human ear can detect amplitude errors within the passband as small as 0.2dB, or am I misinterpreting this? I thought it was closer to 2dB. Feel free to poke me in the eye with a In this particular case there were differences of as much as 5 dB in the upper part of the pass band, between the brickwall and so-called gentle filter. I don't know if they are audible or not, but they are big enough so that their presence creates an unanswered question. In general, we set a +/- 0. 1 dB tolerance, because some variations as small as 0.5 dB are actually pretty easy to hear under some conditions. It's a overkill number, but not very far into overkill.2 dB is perceptually *huge* compared to the type of differences that are routinely audible in ABX tests.There are a lot of conditions on what predicts the potential audibility of a FR differnce. They were presented in detail by means of a chart in the 1978 JAES article by Clark that introduced ABX. For example, narrow dips may be hearder to hear than narrow peaks, and narrow variations may be harder to hear than varaitions over wide ranges. Variations near 4 KHz may be easier to hear than variations near 20 Hz or 20 KHz.