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From: sjc@angband.UUCP (Steve Correll)
Newsgroups: net.audio
Subject: Re: Spring cleaning Preamps (actually CD vs LP)
Message-ID: <60@angband.UUCP>
Date: Mon, 27-May-85 14:32:07 EDT
Article-I.D.: angband.60
Posted: Mon May 27 14:32:07 1985
Date-Received: Thu, 30-May-85 05:19:02 EDT
References: <141@utflis.UUCP> <301@moncol.UUCP> <494@edison.UUCP>
Organization: S-1 Project, LLNL
Lines: 24

> > Advantages of a good record player:
> > - Better imaging.  CD players introduce phase distortions which kill
> >   psychoacoustic cues.  Audiophile records have more depth, and
> >   instrument placement is more focused.
> Lets be serious, try checking out the phase distortions in your high
> falutin cartridges, step-up transformers and RIAA equalization networks.
> Compare to digital filtered CD players with shallow filters (no contest).

Some numbers (not guaranteed to be meaningful or representative): the
current issue of Stereo Review reports that a Technics SL-P3 CD player
exhibits less than 4 degrees interchannel phase difference at
20kHz, despite having only one D/A, thanks to the use of an all-pass
phase shifter.  The June 85 issue of Audio reports (without
verification) that ADS claims their new CD player exhibits less than 5
degrees of phase shift at 20kHz relative to mid-frequencies.  And the
March 1984 Audio reported a 130 degree interchannel phase difference at
20kHz for a Sumiko Talisman S cartridge (later reduced to 13 degrees by
tweaking the preamp input capacitance) and a 38 degree interchannel
phase difference at 20kHz for a Linn Asak moving-coil cartridge. Anybody
have any numbers handy on cartridge phase response w.r.t. frequency? On
step-up transformers?
-- 
                                                           --Steve Correll
sjc@s1-b.ARPA, ...!decvax!decwrl!mordor!sjc, or ...!ucbvax!dual!mordor!sjc