AM Stereo - Quadraphonic broadcast

[Jaap74]

AM Stereo - Quadraphonic broadcast

Ok that title sounds like total garbage and I thought so when I read it too.

Anyway download this AM radio show in MP3 from the USA from February this year :

http://robbspewak.com/robbradio/index.php?/archives/2010/02/C2.html

Play through a receiver that can output Dolby Pro Logic II (Movie mode sounds better than Music to my ears) and you get a Quadraphonic treat ! At the very start there is a channel test and you can hear 4 discrete channels.

Here's the lowdown on AM Stereo :

http://en.wikipedia.org/wiki/AM_stereo

I'm just listening to it now, it really works, some great songs on so far :

Aerosmith
Elvis
Frank Sinatra
Doobie Brothers
Chicago
Ringo Starr
Moody Blues
Creedence Clearwater Revival
John Lennon
The Doors
Pink Floyd
Deep Purple
ZZ Top

Obviously its all 70's stuff from when Quad was cool..... pity there isn't more Surround Sound music produced nowadays !

Do yourself a favour !!

 

[Mr_Sukebe]

Just for info DPL2 takes a DPL signal and invents the "discrete" rear channels. The information does not exist in the source signal.

 

[Jaap74]

Yes that makes sense but listen to it and there sounds like there are 4 seperate channels. In the channel test at the start they talk in the 4 different speakers (front left and right, rear left and right) and they are totally isolated.

Regardless of how it does it I like it !

EDIT : Heres the explanation of how it was done :

"On February 26th 2010, KCJJ (AM 1630) in Coralville, Iowa aired a four hour Quadraphonic radio broadcast of the Robb Spewak show. The show spotlighted music from the quadraphonic era on the 40th anniversary of the format's release in America and was engineered by Tab Patterson. All the music was from discrete 4-channel tapes, then encoded into Dolby Pro-Logic II and transmitted using their stereo C-QUAM transmitter. It was the first time AM radio was featured in this surround sound capacity."