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Path: utzoo!linus!philabs!cmcl2!seismo!harvard!talcott!panda!teddy!rdp
From: rdp@teddy.UUCP
Newsgroups: net.audio
Subject: Re: Crossovers - Throw the book away?
Message-ID: <1464@teddy.UUCP>
Date: Mon, 21-Oct-85 11:05:46 EDT
Article-I.D.: teddy.1464
Posted: Mon Oct 21 11:05:46 1985
Date-Received: Wed, 23-Oct-85 07:38:45 EDT
References: <808@houxa.UUCP> <63@drune.UUCP>
Reply-To: rdp@teddy.UUCP (Richard D. Pierce)
Organization: GenRad, Inc., Concord, Mass.
Lines: 17

In article <63@drune.UUCP> mohler@drune.UUCP (MohlerDS) writes:
>
>I agree whole heartedly with your posting, however I thought I might add
>one quick comment. If the driver whoose impedance you are trying to linearize,
>(with a shunt) is mounted in the enclosure it will be used in while testing the
>effectiveness of that shunt. You will get a more accurate compensation effect.
>

No, this is not so. The shunt capacitor/resistor method of linearizing
impedance takes care of the driver's voice coil inductance. This is
pretty much unaffected by mouniting/enclosure, as it is well above the
region affected by the enclosure. For example, one notices a (nearly)
montonic rise in impedance in a typical 8" woofer above 500-1000Hz due 
to the voice coil inductance, where the enclosure affects the impedance curve
due to the resonance, which is usually restricted to below 100 Hz.

Dick Pierce