Bob Miller wrote:

On Sun, 15 Oct 2006 20:47:00 -0400, SR wrote:

I am interested in learning more about Quadraphonic stereos and it's music.

Stereos usually had 2 speakers.

But if the stereo had four speakers or more, did that makes it Quadraphonic?

To know if the stereo was Quadraphonic, must the word Quadraphonic be
mention in the manual? -Describing it as a Quadraphonic Receiver?

And what about Quadraphonic music being broadcast from the radio? How
did that worked?

Does Joe Franklyn, Danny Styles, Symphony Sid or Phil Shapp plays any of
this?

Ah those beautiful stereos with silver faces, needle light and silky
turner. Those were the days!


QTH New York City
73, SR!

I seem to recall quadraphonic LPs came and went in a year or two in
the Seventies. No one could figure out what to put in the rear
speakers. It didn't make sense to be sitting in the middle of a band,
sound-wise.

bob
k5qwg

Quad LPs (CD-4) were around for a while, but the front/back
information was encoded as an ultrasonic subcarrier, and a special
needle was needed. IIRC, a regular needle would destroy a CD-4 disc.

As for the encoding techniques, there was SQ, QS, logic-enhanced
variants... a childhood friend's parents had a full quad receiver with
all the various settings to cope with the formats. WCLV, Cleveland,
broadcast in quad for a while, and, I think, in Dolby-FM.

Some of the higher end audio shops in Cleveland ran quad ads on WCLV:
"Now I'm in front of you. Now I'm behind you. To your left, and to
your right. If you are listening on a regular stereo, you heard left,
right, left, right. We at Audio Craft can show you how quadraphonic
stereo can enhance your listening experience..."

--
Eric F. Richards,
"It’s easy to fall into the trap of thinking that the purpose of a
business is to make money. But the real purpose of a business is to
create value. While it’s possible to make money in the short run
without creating much value, in the long run it’s unsustainable.
Even criminal organizations have to create value for someone."
- Steve Pavlina, April 10, 2006

Eric F. Richards wrote:
Bob Miller wrote:

On Sun, 15 Oct 2006 20:47:00 -0400, SR wrote:

I am interested in learning more about Quadraphonic stereos and
it's music.
I seem to recall quadraphonic LPs came and went in a year or two in
the Seventies. No one could figure out what to put in the rear
speakers. It didn't make sense to be sitting in the middle of a band,
sound-wise.



Mike Oldfield's "Boxed" was produced in quad.. It sounded fine on my
stereo but i was itching to try it out on a proper quad system! Did i miss
much?

Les

--
Remove Frontal Lobes to reply direct.


By all means let's be open-minded, but not so open-minded that our
brains drop out. (Richard Dawkins)

http://armsofmorpheus.blogspot.com/

http://www.richarddawkins.net/index.php


Les Hemmings a.a #2251 SA

"Les Hemmings" wrote:

Eric F. Richards wrote:
Bob Miller wrote:

On Sun, 15 Oct 2006 20:47:00 -0400, SR wrote:

I am interested in learning more about Quadraphonic stereos and
it's music.
I seem to recall quadraphonic LPs came and went in a year or two in
the Seventies. No one could figure out what to put in the rear
speakers. It didn't make sense to be sitting in the middle of a band,
sound-wise.



Mike Oldfield's "Boxed" was produced in quad.. It sounded fine on my
stereo but i was itching to try it out on a proper quad system! Did i miss
much?

Les

I don't know. I never had unrestricted access to a quad system. what
I did -- and this works only on some systems and may be downright
unsafe on others -- was to set up a Hafler Matrix. This is a passive
arrangement of the rear speakers to pull out L-R and R-L information
for back speakers, just wiring them to an existing stereo.

Being a passive system, there isn't a lot of control on what you can
do with it, but it will pull out the surround/quad information in the
right environment.

To wire a Hafler Matrix, you need a system with a common ground for
the left and right channels. Since this isn't a graphic interface,
I'll draw out the wiring on a couple lines:

Left + on stereo ---- Red on Left/Rear speaker
Black on Left/Rear speaker ---- Black on Right/Rear speaker
Red on Right/Rear speaker ---- Right + on stereo

The speakers face each other and should be several feet back from the
listener to introduce a little bit of delay. The arrangement takes
some fiddling to get right, but works on the cheap.

FWIW, the Wikipedia article on Quad elsewhere in this thread claims
that the Hafler Matrix works as well as any other quad/surround method
for pulling the surround info out. I find that *extremely* hard to
believe. But it is a cheap, workable solution.

Regards,


--
Eric F. Richards

"Nature abhors a vacuum tube." -- Myron Glass,
often attributed to J. R. Pierce, Bell Labs, c. 1940