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From: Clifford Heath
Organization: Open Software Associates Limited
X-Mailer: Mozilla 4.61 [en] (X11; I; Linux 2.2.17 i686)
Subject: Re: Speaker phase and current vs voltage drive
X-Cache: nntpcache 2.3.3 (see http://www.nntpcache.org/)
NNTP-Posting-Date: Tue, 29 Oct 2002 10:17:59 EST
Date: Tue, 29 Oct 2002 10:17:59 +1100
> ...No matter how it works...
>> ...The current technology appears to work...
Some people have problems reading. It obviously works. I asked why!
Thanks to those who gave partial technical explanations (3 Johns
and Chuck). Although I understand what you've said, I don't feel
entirely enlightened. It seems to me that:
* it's possible to reproduce the SPL fairly accurately,
* it's unlikely that our technology does,
* our ears are remarkably competent at hiding deficiencies,
* a number of justifications are used to avoid thinking
about it, such as "our ears are not sensitive to phase-shift".
Though the justifications are likely true, that doesn't seem enough
of a reason not to attempt a combined mechanical/electrical end-to-end
analysis that might yield an improvement.
> Voice coils are usually spring suspended
How linear are those springs? The construction techniques I've seen
incline me to think they get stiffer with greater displacements, which
would create 2nd harmonic distortion. My experience here is with a pair
of Altec-Lansing 8's, both the original drivers and modern (Kevlar and
carbon) mids and tweeters I had fitted earlier this year - very sweet
speakers! The replacement got started when the original woofer cone
suspension died and needed fixing, a job competently carried out by
Total Recoil in Melbourne - thanks guys, very happy with the result!
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