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From: 9221mac@hou2f.UUCP (M.CARLETTA)
Newsgroups: net.audio
Subject: RAW SPEAKERS
Message-ID: <508@hou2f.UUCP>
Date: Thu, 25-Jul-85 09:51:27 EDT
Article-I.D.: hou2f.508
Posted: Thu Jul 25 09:51:27 1985
Date-Received: Fri, 26-Jul-85 20:23:57 EDT
Organization: AT&T Bell Labs, Holmdel NJ
Lines: 31

Glad to see renewed interest in speaker building on the net.
After 9 mos. of scattered work on weekends I've finally completed my
latest set, a 3 way system using 18db/octave passive crossovers.
The crossovers were optimized by making impedance measurements
of each driver, no Zobel networks were necessary; all crossover parts
were within 1% of the calculated value, and film caps were used
liberally.

It consists of a 12" Dynaudio woofer in a 3' high pentagonal
column (fourth order alignment). The mids and highs are handled
by ferrofluid damped Morel drivers mounted on a 2" thick, flat
trapezoid which is attached to the top of the column. The bottoms
are made of heavily braced industrial flake board covered with
beautiful red oak veneer. The tops are made of solid oak.

The sound compares well with commercially available speakers in the
$1500 - $2000 per pair price range. The imaging is not quite as good as
my 24db/octave tri-amped system.

In order to encourage speaker building, I've put together a two page
fact sheet with names and addresses of suppliers, and pointers to
construction information. I'll send it to anyone who sends me an
SASE, and promises to let me know when they succeed.

	Steve Johnson
	113 Wynnewood Ct.
	Freehold, NJ 07728
	(201) 577-0271