Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/17/84; site mhuxm.UUCP Path: utzoo!linus!philabs!cmcl2!seismo!lll-crg!dual!qantel!ihnp4!mhuxm!2212zap From: 2212zap@mhuxm.UUCP (putnins) Newsgroups: net.audio Subject: Re: ribbon vs. electro statics Message-ID: <407@mhuxm.UUCP> Date: Wed, 7-Aug-85 18:03:03 EDT Article-I.D.: mhuxm.407 Posted: Wed Aug 7 18:03:03 1985 Date-Received: Mon, 12-Aug-85 20:50:28 EDT References: <42400009@hpfclo.UUCP> <351@uwmcsd1.UUCP> <1069@teddy.UUCP> <1286@hound.UUCP> Organization: AT&T Bell Laboratories, Murray Hill Lines: 24 > > Recently there has been talk about "fast" vs. "slow" woofers. Someone > indicated this is only a function of limited bandwidth of the woofer. > Could someone explain how a, well, bandpass or lowpass system results > in a time delay? Is it just like how an equalizer introduces phase > distortions? Surely an equalizer doesn't introduce audible delays, > does it? > -- > Steve Pearse > ihnp4!hound!pearse *** REPLACE THIS LINE WITH YOUR MESSAGE *** Yes, it is just like the "phase distortions" of an equalizer. And yes, equalizers do introduce delays. Whether they are audible depends on the gold content of your ears. Any phase distortion produced for a particular frequency corresponds to a time delay. ex: COS (WT + D) == COS( W*(T + D/W) ). So a phase distortion of D radians corresponds to a time delay of D/W seconds at frequency W. If D is linearly related to W, then we have a constant time delay across the spectrum, and the effect is just a time delayed version of the original. If the phase distortion is not linearly related to frequency, then you will get a distorted version of the original. Whether this type of distortion is audible also depends on the gold content of your ears :-).