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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 :-).