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Path: utzoo!watmath!watdcsu!herbie
From: herbie@watdcsu.UUCP (Herb Chong [DCS])
Newsgroups: net.audio
Subject: Re: Yet another speaker anomaly
Message-ID: <1238@watdcsu.UUCP>
Date: Sat, 13-Apr-85 15:46:33 EST
Article-I.D.: watdcsu.1238
Posted: Sat Apr 13 15:46:33 1985
Date-Received: Sun, 14-Apr-85 03:41:22 EST
References: <1192@ihuxi.UUCP>
Reply-To: herbie@watdcsu.UUCP (Herb Chong [DCS])
Distribution: net
Organization: U of Waterloo
Lines: 30
Summary: 

In article <1192@ihuxi.UUCP> trough@ihuxi.UUCP (Chris Scussel) writes:
>Here's another speaker anomaly: Doppler shift. A single speaker cone
>attempting to reproduce a loud, low tone and a quieter, higher-pitched
>tone simultaneously will end up frequency-modulating the high tone with
>the low tone. This happens because the large cone excursions caused by
>the low frequency tone give the cone enough velocity to audibly shift
>the apparent frequency of the high-pitched tone as it is emitted by
>the cone. I read about this some years ago and it seems reasonable,
>although I've never knowingly heard it. Any comments?
>
>				Chris Scussel
>				AT&T Bell Labs
>				ihnp4!ihuxi!trough

this used to be quite a problem years ago when people used large drivers
well beyond the range they are used nowadays and also with extremely large
excursion drivers, typically small drivers that claim extremely low
response.  fortunately, most people don't design their speakers that way
and make extravagant claims about low frequency response much anymore.
about the only speakers you may find this in these days are no-name house
brand speakers.

Herb Chong...

I'm user-friendly -- I don't byte, I nybble....

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