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Article #7043Re: Passive Preamps - a minimalist approach
From: Isaac S Wingfield
Date: Thu, 09 Mar 1989 20:24
Date: Thu, 09 Mar 1989 20:24
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1425 bytes
There have been some comments concerning RIAA equalization, and whether or not to be concerned about accuracy; also how to get accurate RIAA eq. (Personal opinion follows) The absolute accuracy is not very important, but the match between the channels is, because your ears depend on differential phase and amplitude information for proper source localization. Use 1% resistors and bridge matched caps to start; then get a good RIAA test record (CBS Labs used to have them), and do the final eq. including the cartridge and tone arm characteristics by starting right in the groove. Attempts at accurate eq. which begin with "inverse RIAA networks" are doomed. If you do this, you will be amazed at just how crappy the signal coming out of that groove really is, and how difficult it is to determine that they are matched anywhere close. Isaac isw@cup.portal.com
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!unmvax!ncar!gatech!rutgers!bpa!cbmvax!uunet!portal!cup.portal.com!ISW From: ISW@cup.portal.com (Isaac S Wingfield) Newsgroups: rec.audio,sci.electronics Subject: Re: Passive Preamps - a minimalist approach Message-ID: <15590@cup.portal.com> Date: 9 Mar 89 20:24:50 GMT References: <1493@ucsd.EDU> <2061@cps3xx.UUCP> <10653@pasteur.Berkeley.EDU> <7214@fluke.COM> <2108@cps3xx.UUCP> Distribution: usa Organization: The Portal System (TM) Lines: 20