jj@alice.UUCP (06/07/85)
>one from the other during the test (but not which was which since the >person working the a/b switch didn't show the listener). ***We attempted >to match up the NEC and the MERIDIAN by ear, admittedly the slight >level difference would cause problems but, in any case, anyone who would >evaluate these would admit that that was not a problem in this case.*** >The tests were done by syncing identical CD's in both players and having >a third person work the a/b switch. >-Ron See the part surrounded by ***'s. No, Ron, I don't buy it. Assuming that you were listening at levels of roughly 80-90 dB, a change of level on the order of .25-.5dB will lead to a perceived change in low bass and high frequency levels on the order of 2-5dB, depending on the level and the listener. Very small level differences at levels close to the thresholds for extreme frequencies cause huge differences in the perceived level. It's a well established FACT! See any of the 1940's and so papers on hearing. (Fletcher and Munson comes to mind, not too surprisingly.) -- TEDDY BEARS HAVE LIMITED PATIENCE! THEY DO EVENTUALLY GET HUNGRY! "Let us remember my cat, Geoffrey, ..." (ihnp4/allegra)!alice!jj
ron@brl-tgr.ARPA (Ron Natalie <ron>) (06/09/85)
> at levels of roughly 80-90 dB, a change of level on the order of > .25-.5dB will lead to a perceived change in low bass and high frequency > levels on the order of 2-5dB, depending on the level and the listener. > > Very small level differences at levels close to the thresholds for > extreme frequencies cause huge differences in the perceived level. > It's a well established FACT! See any of the 1940's and so > papers on hearing. (Fletcher and Munson comes to mind, not too > surprisingly.) I know all about Mssrs. Fletcher and Munson. I didn't give any value judgement on the quality of the players, only that they were different. Even with the F&M curves, we should have been able to get the levels close enough that the EQ's matched if they were ideally the same. However, it each case, the NEC EQ was different (to the less bright side, than the Meridan). Of course, we weren't able to say which one was correct, it was just a passing observation. The major aspect of the test, the comparison against the SLP7 is unaffected by levels. You can hear the SLP7 distort at any level with respect to a decent CD player. -Ron