https://www.quadraphonicquad.com/fo...-4-demodulator-archive.9035/page-9#post-72563^^^
...to roll off frequencies above 13 KHz. This has remained pretty much a standard.
Some interesting info from Louis Dorren from the disc mastering perspective.
Kirk Bayne
This was a depressing article.View attachment 96041
A CD-4 display unit showcasing best sellers.
February 17, 1973
THE 4-CHANNEL
PICTURE: CD-4
Actively Battles
Against SQ
The total number of quadrasonic albums released in Japan surpassed the 500 mark before 1972 ended.
But despite the payment of “record" winter bonuses and the Christmas New Year holiday spending spree, sales results were seen to be disappointing.
As of Christmas Day, 138 compatible discrete 4-channel (CD-4) album releases were listed by Victor Musical Industries, the former musical enterprise division of the Victor Co. of Japan (JVC/Nívico), Three CD-4 albums were available from Nippon Phonogram, the Philips-Matsushita/JVC joint recording venture, as of Nov. 25, and three were listed by Teichiku Records, a member of the Matsushita group, as of Oct. 25. Earlier in 1972, the Japan subsidiary of Polydor discontinued production of its two CD-4 albums. Thus, the total number of CD-4 albums listed in the Japanese catalogs amounted to 144.
Meanwhile, the total number of SQ quadrasonic records available in Japan was also expected to reach 144 as of Feb. 25, 1973, including 114 releases from CBS/Sony: 27 from Warner Pioneer, two from Canyon Records, and one from Trio.
While the manufacturers of CD-4 Quadradises in Japan have not revealed any pertinent figures, the CBS/Sony joint venture claims that it has sold over one million SQ records since its initial release Oct. 21, 1971. (JVC released its first CD-4 album May 25, 1971).
Exactly 1,130,743 SQ records have been sold in Japan by CBS/Sony Records, as of Oct 21, 1972, including 379,826 LP's and 750,917 seven inch pieces, according to the Tokyo based record company.
Of the 379,826 SQ albums, 274,569 were of international origin (218,044 popular and 56.525 classical) and 105.257 Japanese, according to the manufacturer. Of the 750,917 SQ singles 671,424 were of Japanese origin and 79,493 comprised international pops.
Standard retail price of an SQ album produced in Japan is about $7, while an SQ single retails for about $1.70, about the same as for conventional stereo records, and CD-4 Quadradiscs.
The only quadrasonic stereo album listed among the top 30 best sellers in the dealer oriented “Record Monthly" published by the impartial Japan Record Promotion Co.. Ltd was Leonard Bernstein's "Mass” pressed and released in this country Sept. 21, 1972, by CBS/Sony Records. It was priced at the equivalent of some $16 retail.
At the same time, the London recording of Holst's “The Planets" by Zubin Mehta and the Los Angeles Philharmonic Orchestra, pressed in Japan by King Records, stole the number one spot long held by the Philips recording of Vivaldi's "Four Seasons" by I Musici, produced in this country by Nippon Phonogram. Both are conventional stereo disks.
As a matter of fact, "Record Monthly” has suspended separate listings of 4 channel disks, beginning with its December 1972 issue, barely seven months after the Japan Phonograph Record Assn. and the Electronic Industries Assn. of Japan (EIA.J) adopted the CD-4, SQ and RM (regular matrix) systems of quadra sonic recording and reproduction as standard.
The EIA J's adoption of the three quadrasonic systems as standard was announced in Osaka at the opening of the Third Kansai (West Japan) Audio Fair sponsored by the Japan Audio Society (JAS), April 12-17, 1972.
The major Japanese music stores like Kotani, Jujiya, Yamaha (Nippon Gakki) and Yamano have more recently discovered that better sales results are achieved by mixing the quadrasonic disks with conventional stereo albums in browser boxes under artists’ names and musical categories, rather than selling them in separate display racks. Likewise, the major Japanese electrical stores like Ishimaru Denki, Shintoku Echo and Yamagiwa which have record sales departments.
Ratio of CD-4 to SQ sales depends on the popularity of the artist or title released each month, according to Kotani's main store in Shinjuku, the most heavily trafficked area in Tokyo today. This store is selling 30 quadrasonic records a month at best. On the other hand, Yamagiwa's audio department says it has sold up to five or six CD-4 albums for every one or two SQ.
The total number of Sansui QS regular matrix system disks and other quadrasonic records listed in the Japanese catalog was 236 as of the end of last year, according to a head-count made by Billboard's Tokyo news bureau.
^^^
RCA Records...shooting down rumors it had adopted the SQ system.
First I've heard of this about RCA Records, also, the matrix proponents like to use the word "discrete" when describing their logic systems:
...SQ matrix logic decoder but also provide "discrete" separation in playing back quadrasonic records.
Kirk Bayne
Why do I have trouble believing you? Those events happened as described.You always repeat the "woman putting face powder on" story but it just doesn't ring true because CD-4 records are NOT that fragile. I have heard similar stories about various things from record/stereo store owners many times and I have reached the conclusion they mostly were making things up, not being technically proficient.
I have heard the echoey, explosive sounds from CD-4 records and it has to be related to out of phase signals reaching the various sections of the demodulator at different times which would chiefly be caused by tracking issues
I have zeroed tracking in on my system and I don't experience any of the "devil's work" issues commonly claimed for CD-4 reproduction. As I have said many times, playing CD-4 records, for me, is no different from playing regular two channel records.
And, I don't feel I have had to work my ash off to acquire that result. Just have always followed the CD-4 rules and used equipment proven to work.
And yes, I have the separation at maximum so it's not the matter of sacrificing separation for improved performance.
Doug
Well, RCA did have the RM type matrix...."Dimension IV".
Thanks for the article. Here it is: HIGH FIDELITY, March 1973.Yes, I do recall (maybe High Fidelity mag) having a news item that some RCA brand home audio components did have a system to (AFAIK) create fake quad from stereo - the article wondered where discrete quad was in these RCA home audio systems (I'll see if I can find the news item).
(found the news item):
https://worldradiohistory.com/Archi...idelity/70s/High-Fidelity-1973-03.pdf#page=30^^^
RCA adds that Dimensia IV will play Quadradiscs as enhanced stereo.
Where be discrete quadraphonics now?
I remembered the unusual wording of the last sentence in the news item.
Kirk Bayne
YES!!!!"Matrix does enhance stereo, no question about it. But the question is can you justify the premium cost of playback equipment, which is in effect 4-channel playback, just to enjoy improved 2-channel material?"
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