Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site mouton.UUCP Path: utzoo!watmath!clyde!bonnie!akgua!mcnc!decvax!bellcore!mouton!karn From: karn@mouton.UUCP Newsgroups: net.audio Subject: Re: Nakamichi OMS-7/OMS-5 Compact Disc Players Message-ID: <226@mouton.UUCP> Date: Mon, 10-Dec-84 02:14:32 EST Article-I.D.: mouton.226 Posted: Mon Dec 10 02:14:32 1984 Date-Received: Thu, 13-Dec-84 03:05:16 EST References: <181@decwrl.UUCP> Organization: Bell Communications Research, Inc Lines: 31 Hate to beat a dead horse, but I thought I'd throw out this fuel for the fire. I recently obtained the service manual for my Technics SL-P7 CD player. You know, one of the "el cheapo" models with (horrors!) analog reconstruction filters, and (double horrors!) a single D/A converter. All in all, a unit that "gives digital audio a bad name" (to quote one of the net experts). In scanning the schematic, I immediately noticed some assymetry between the two channels. It turns out that they put in an ANALOG all-pass filter in the left channel whose sole function it is to delay the signal by 1/2 sample to make it "match" the right channel. So there. They saved me the tedious effort of moving my left speaker back by a centimeter or so. Phil P.S. I recently attended a live performance of Saint-Saens Organ Symphony given by the Baltimore Symphony Orchestra. Compared to my reference CD player, the live performance lacked proper stereo imaging and had shrill, harsh highs. The noise level was also considerably higher (no audience should have been allowed) and there was obvious multi-miking in the acoustic design of the concert hall. (Seriously though. The live concert made me realize how far we've come in sound reproduction. Except for the audience noise, I could close my eyes and imagine myself sitting at home in front of the CD player. So why did I blow $16.50 per ticket?)