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I think the short answer is that the recording curve was imposed in the analog domain, in reversing it for playback, only analog eq handles the phase response correctly. Also, applying eq digitally to a truly flat transfer reduces available headroom somewhat. Doug Pomeroy Audio Restoration & Mastering Services Transfers of metal parts, lacquers, shellac and vinyl discs & tapes. 193 Baltic St Brooklyn, NY 11201-6173 (718) 855-2650 [log in to unmask] > Date: Tue, 10 Apr 2012 08:49:37 -0400 > From: Tom Fine <[log in to unmask]> > Subject: Re: Recording_78rpm_records > > Read the article, it was in the ARSC Journal a while back, maybe a > year or two. Too technical to > summarize here, at least for this non-EE. > > ----- Original Message ----- > From: "Andrew Hamilton" <[log in to unmask]> > To: <[log in to unmask]> > Sent: Tuesday, April 10, 2012 8:39 AM > Subject: Re: [ARSCLIST] Recording_78rpm_records > > >>>>> Gary has also written for ARSC Journal advocating analog >>>>> playback and EQ of >>>>> grooved media, rather >>>>> than "flat playback" and software EQ, and has specified the >>>>> technical >>>>> reasons why analog EQ works >>>>> differently from DSP EQ. >> >> >> >> What is it about minimum phase digital audio equalization, such as >> that >> found in a de-RIAA or RIAA plugin, that Mr. Galo feels is not up to >> snuff?