Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: Notesfiles $Revision: 1.7.0.8 $; site convex Path: utzoo!linus!philabs!cmcl2!seismo!harvard!talcott!panda!genrad!decvax!harpo!whuxlm!whuxl!houxm!ihnp4!inuxc!pur-ee!uiucdcs!convex!wilson From: wilson@convex.UUCP Newsgroups: net.audio Subject: Re: equalizers Message-ID: <32900018@convex> Date: Fri, 9-Aug-85 03:07:00 EDT Article-I.D.: convex.32900018 Posted: Fri Aug 9 03:07:00 1985 Date-Received: Sat, 17-Aug-85 06:30:16 EDT References: <7351@watdaisy.UUCP> Lines: 27 Nf-ID: #R:watdaisy.UUCP:-735100:convex:32900018:000:1453 Nf-From: convex.UUCP!wilson Aug 9 02:07:00 1985 If differences in signals between two systems are not evident in their frequency responses then somebody had better publish that quick ! EE departments throughout the world are teaching students otherwise when they introduce the poor unsuspecting people to Fourier transforms. Seriously though, an (analog) equalizer doesn't exist which could be used to correct anything other than gross disturbances in the system's frequency response. My system has and has always had such disturbances (they vaired from dwelling to dwelling, though) and I've used an octave wide Soundcraftsmen equalizer for years. In my case, it's been better than nothing (my speakers seem to have a nasty peak around 7000 Hz no matter what kind of room they're in) but I've convinced myself that a 1/3 octave equalizer would be far superior. These are not at all cheap though, and I could probably replace my speakers and solve the problem that way for a little more money. My Soundcraftsmen eq. came with a record that has bands of octave centered pink noise on each channel at a time, with an (optional if you have a meter) Fletcher-Munsen weighted reference signal in the opposite channel. In actual use, the "flat" eq. setting arrived at through iterations of the test record was fine for a starting point, but often slightly changed for individual source material. Some source is best with the eq. out of the loop entirely. {ihnp4,allegra,uiucdcs,ctvax}!convex!wilson