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From: jas@proteon.com (John A. Shriver)
Newsgroups: rec.audio.high-end
Subject: LS-3/5A
Message-ID: <12151@uwm.edu>
Date: 15 May 91 12:48:54 GMT
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Approved: tjk@csd4.csd.uwm.edu
Originator: tjk@csd4.csd.uwm.edu

All LS-3/5A's have that little boom at 120 Hz.  The BBC (who license
the design to manufacturers) designed it in as a psyhco-acoustic
correction for the lack of true lows.  The BBC requires such strict
quality control on the LS-3/5A so that all will sound the same.  The
standards are so strict that pair matching is not required, 10 years
later you can replace one speaker of a pair.  They are reference
monitoring speakers that they still use for on-site recording, and
they want them all to sound the same.

Good positioning on stands can help the boom, but it won't go away,
and makes interfacing with subwoofers quite difficult.  Still, there
are many things that they do so right, I happily used a pair for over
10 years.

They are not very effiecient, about 82 dB at 1 Watt.  They also don't
have a lot of power handling, and can be fried if you are careless
with a high-power amp.