From gabru@comsec.net Sat Apr 16 00:10:29 2011
Subject:Re: Stereo surround sound
Voice of the Theater is old theater technology.....I used Altec A-7s back in the 1970's....Here an interesting bit on these old speakers from
Steve Guttag on the Film Tech Forum back in 2002:
"James B Lansing was the one and the same with Altec and JBL...he was fired from both companies and committed suicide. Altec came first and was an outgrowth of ERPI.
JBL is living with, to this day, the fact that James B. changed how he designed his drivers when forming JBL. Altec had an outward cone motion when a positive voltage was applied to the "+" terminal. JBL drivers were just the opposite.
JBL is slowly switching all of that though. You will find that the legacy drivers like the 2226, wich replaced the 2225, which replaced the 222x...are, to this day, all positive voltage on red causes the cone to pull in. Same with the HF drivers like the 2446, which replaced the 2445, which replaced the 244x...positive on red causes the diaphragm to draw air into the throat.
New drivers that don't directly replace any previous driver...like the 2242 (as used the 4645C subwoofer) are positive on red causes and outward cone motion. So if you have a system with JBL 4675Cs for stage speakers and 4645C subwoofers and 8330A surrounds...the stage speakers will be out of phase with the subs and surrounds if everything is wired red to red and black to black.
JBL and Altec most certainly did co-exist. JBL has had similar speakers to Altec though they were never the same. Altec VOT speakers always had a front vented driver, I don't think JBL ever did (note the screen on the dust dome of a 515 for the air to escape).
JBL's answer to the A-4 was the 4676. The JBL answer to the A-5 was the 4674 and the JBL answer to A-7 was the 4672. JBL's double-15 horn loaded speakers were always horizontal horns (like with the Altec 211 cabinet...the A-4 used the 210 cabinet)."
So if you are still using these old speaker systems check the phase!!!!
From: CloneWheel@yahoogroups.com [mailto:CloneWheel@yahoogroups.com] On Behalf Of Paul Kealy
Sent: Friday, April 15, 2011 5:15 PM
To: CloneWheel@yahoogroups.com
Subject: [CWSG] Re: Stereo surround sound
It IS great to have the flexibility to design whatever we want
with today's technology. And JBL Voice of the Theatre with
its exponential horn does nice things for a reed organ stop
in the ambient mix.
PK
StentorVox.com
--- On Fri, 4/15/11, Bill > wrote:
To: CloneWheel@yahoogroups.com
We play in stereo and other than the drums, I notice very little difference.
To be honest though I haven't heard the total sound with me playing. 5.1
That's a gem!!
On Apr 15, 2011, at 3:11 PM, Bobby Simons wrote:
They're just jealous.
Tell them to shove it -
one more complaint and you're going to go 5.1. ;-)
On Apr 15, 2011, at 9:04 AM, stateofmin@aol.com wrote:
I know everyone talks about playing in stereo. My band won't let me and tell me that stereo playing live is a bunch of BS and that no one can hear the stereo separation in any event
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