Actually, we all know that close coupling eight identical resonant circuits
will drive the poles apart and generate a rather lumpy, but flat response
and this was all that was going on here. (The front facing ninth speaker
wasn't really coupled into the rear eight.) Just simple circuit theory.
Then, adding an inverse response in series with the total speaker
response -- the equalizer -- created what is known as a quasi-linear system.
Nothing more exotic than what some Hams do with outboard microphone
equalizers to optimize their SSB signals.
Yes -- it required a REALLY GOOD AMP -- like running 100 watts with 50v
solid state finals to achieve low distortion and IM.
73 -- Larry -- W1DYJ
----- Original Message -----
From: "W2RU - Bud Hippisley" <W2RU@frontiernet.net>
To: "bill steffey NY9H" <ny9hpa@gmail.com>
Cc: <towertalk@contesting.com>; "Jim Lux" <jimlux@earthlink.net>; "Richard
(Rick) Karlquist" <richard@karlquist.com>
Sent: Saturday, August 31, 2013 7:00 PM
Subject: Re: [TowerTalk] rotating delta loop
On Aug 30, 2013, at 8:34 45PM, bill steffey NY9H <ny9hpa@gmail.com> wrote:
when bose introduced their multi speaker facing the wall...
not only did 'consumer's' not like it ;;;
Guess I'm not a 'consumer'....to my ears it was better and
cleaner-sounding than any other speaker in its price range. And those
'ignorant' professionals who reviewed speakers for the leading audiophile
magazines seemed pretty impressed, too.
the guys at the other manufacturers had little regard for the "science"
using multiple 4" midrange drivers with HUGH 15-20 db eq at the bottom &
top
causing most amps to run out of power , and go mushy
There is no question the technique required clean high power amplifiers.
Otherwise, it was going to sound about the same as an SSB transmitter
trying to coax 1000 watts of RF out of a pair of 807s.
no highs...no lows ...must be bose.....
Paul Klispch from Arkansas said "' Ho Hum another " breakthru in
Physics"
or as one of the engineers at JBL,
All totally unbiased observers....
all those drivers putting out the same output creating
a mess of mixing delay times at the listeners ears...
Unlike the use of separate woofers, tweeters, and mid-range speakers -- a
technique that never had any phasing or crossover issues.
We probably should get back to rotating delta loops...the pseudo-science
here is getting a little thick.
Bud, W2RU
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