Exploring Billboard for Quadraphonic Information

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Did the QS and SQ records for jukebox DynaQuad place content near CB so that the Hafler circuit would have something to route to the surround speakers?
They were the same as the regular album releases. There are threads here about them. The ABC "PRO" series were mini LPs. usually containing four selections from the full length "Command" LP. CBS had some mini SQ LP's as well.

The single 45 releases were less common. I have few in my Discogs want list.
 
Ahhh...The good ol' Dave Hafler circuit! Still using it after all these years, since 1972.
Using 2.0 amps, and home built subwoofers (with passive radiators,) subwoofer amp from Amazon for 15 bucks. Using the same setup on my 2 home theaters. While stationed overseas, I did buy a Sansui QRX3500. But I didn't notice any difference. So I sold it and started building my own surround sound systems utilizing the Dave Hafler circuit, and home built spkrs. Works for me!👍(Just a poor military veteran living in the Republic of Panama)
 
One other issue - some type of analog NR (more like a dbx wideband system than Dolby B) could have been used on the newly added subcarriers for quad FM.

Since only quad FM radios would demodulate the new subcarriers (and could apply the NR), existing FM mono and stereo radios would be unaffected.


Kirk Bayne
When I bought and installed a FM radio in my 62 Buick, I sent the right and left outputs to the rear deck 6X9 Craig pwr play spks. Then used the "Dave Hafler circuit" (Google it) for the front dashboard center spkr. An excellent surround sound experience in my "Big as a Whale" Buick back in the 60s with a stereo signal. Worked great 👍.
I first read about the circuit in Sound and Vision magazine many years ago as a teenager. Now I'm 75, have two home theaters set up using the Dave hafler circuit for surround sound and laser projectors. (With subs and Aura butt shakers.) I bought and later sold a Sansui QRX3500 while stationed in the Philippines. I discovered the Dave Hafler circuit does just as well as the SQ and QS decoder in the Sansui QRX3500, using only stereo output signal.
 
Here’s an article about San Francisco Bay Area radio stations in 1976, by legendary music critic/historian Joel Selvin. It’s part of a general spotlight on the Bay Area, March 13, 1976 issue. Quadraphonic radio is mentioned briefly, along with AM stereo. For those of us who grew up in Northern California, this is a fascinating report about what was happening with radio in 1976.

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Varied Radio
Formats Spread
Across Bay Area
Vastness


March 13, 1976

By JOEL SELVIN
San Francisco may have given birth to progressive radio at KMPX-FM nine years ago, but radio in the Bay Area today seems virtually unchanged from the conservative, orthodox mode in which it was set when deejay Tom Donahue began broadcasting what became known as "underground" radio after midnight on the small foreign language station at the far end of the dial.
True, KSAN-FM, successor to the original KMPX, continues to thrive, on the verge of becoming a San Francisco institution in its seventh year of undeterred dominance. But KSAN is virtually the only radio station in the Bay Area to reflect or become involved with to any degree the local music scene.
“San Francisco radio is probably no different than anywhere else," said Bill Gavin of the Gavin Report tipsheet. KSAN general manager Jerry Gra-ham, a relative newcomer to the Bay Area, echoed those sentiments.
"As far as I can see, San Francisco radio is no different from radio in most major cities,” said Graham, former WNEW program director who still owns his own radio station (WGRG, Pittsfield, Mass.), which he built literally from the ground.
Graham assumed his KSAN responsibilities last summer, replacing the late Tom Donahue, who brought underground radio to KSAN in 1968, following a strike at the original KMPX.
"What makes KSAN different,” Graham continued, "I guess, is the past history. We've got tremendous tolerance from our listeners to go off in different directions."
If KSAN, as the undisputed boss of Bay Area progressive rock stations, does reflect something of the City's unique flavor in its free-wheeling, irreverent approach, most of the other stations in town offer nothing different than anywhere else, as Graham and Gavin noted.
KFRC, with its powerful signal, bare-bones playlist and yappy jocks, holds the same commanding position as northern California's number one Top 40 rocker it has enjoyed for the past half dozen years. The latest ARB book gave KFRC record-breaking cumulative ratings, the highest of any station west of the Mississippi for the first time in station history.
Over at KYA, the traditional competition for KFRC, confusion seems to reign on the AM side, while energy focuses on the renewed FM half, where former KMPX-KSAN disc jockey Bobby Cole recently took over as music director. He and KYA program director Mark Taylor do the only live shows on the FM currently, but Cole hopes to be full-time live by April.
Jim Gabbert, owner of K101. plans to split his AM and FM entirely once the FCC approves the application, now pending, for a power boost to the AM which will spell an end to its sundown days. Gabbert recently completed more than two years work, using his station to experiment, on quadraphonic broadcasting for the FCC, and has now begun work on a similar study on AM stereo. He also recently purchased a Honolulu progressive rock station (KIKI-AM).
While K101 continues to program an eccentric mix of Top 40 and MOR, KCBS-FM approaches the adult contemporary market with a less hit-ori-ented "soft rock" sound. Evaluating the station's impact, however, has always been hampered by diary confusion created with its sister station, KCBS-AM, the City's top-rated all-news station.
The AM side of adult radio is dominated by KSFO and KNBR, both of which emphasize broadcast personalities over music formats, although KSFO is often credited by local record company promotion representatives with broader taste in music than its MOR tag might indicate.
While no progressive rock station besides KSAN currently broadcasts from San Francisco, FM stations in the outlying areas--both San Jose and Marin counties—are beginning to have their influence felt.
In Marin, across the Golden Gate Bridge, KTIM has gone from a distinctly provincal FM station to a thoroughly professional, sprightly radio station, operating both on FM and an AM sundowner. An application to boost the AM power rating to 5,000 watts is pending, which would make a large difference for KTIM.
Currently, the station's signal is only heard best in Marin and parts of the East Bay. San Francisco coverage is spotty, although KTIM slips into some bayside areas of San Francisco with greater strength than in-town FMs.
According to station manager Clint Weyrauch, the station is making money for the first time in five years. Weyrauch says the station is "not even conscious of ratings at this point . . . we're a small station, but we seem to move lots of people." This may be true, but, according to Michael Kilmartin--who, as promotion head for Eric-Mainland distributors, oversees a dozen labels in the Bay Area-"you can't sell a matchstick's worth of albums unless KSAN plays it."
In San Jose, KOME and KSJO vie for the progressive market against some surprisingly strong college competition (KFJC at Foothill Junior College, and KZSU at Stanford, especially). KSJO recently converted to the "Earth Rock" format that worked well for KSFM-FM near Sacramento, including hiring program director Don Wright and music director Burt Baumgartner from KSFM.
KOME-FM in San Jose has risen rapidly from a free-form station to the South Bay's leading progressive rocker with a boogie-inclined sound that caters substantially to the car crowd of Santa Clara county.
Until a couple years ago, KDIA-AM of Oakland ruled the large black radio listening audience. No less than three different stations have encroached on their territory since, causing KDIA to continue its dominance only with a few changes.
Nevertheless, stations like Berkeley's KRE-AM/FM, the Peninsula's KSOL-FM, and KSFX, an ABC atfiliate now playing disco / soul music with good results, have carved their niche in the Bay Area. KSOL and KRE both reach more specialized audiences, with KRE appealing especially to Berkeley with a decidedly hip mix of r&b and progressive jazz. According to Kilmartin, some records played on KDIA, KSFX, and KSOL at once can sell nearly as well as hits on KFRC or KSAN.
Ethnic folk music and avant-garde jazz can be heard with relative frequency on KPOO FM, Poor People's Radio, and KPFA-FM, the local Pacifica listener sponsored station. Pat Henry's KJAZ-FM continues to roll along, programming a tasty mix of '50s, '60s and '70s jazz and Latin, making it the only pure jazz station in the Bay Area.
True, KMPX-FM, recently purchased by film director Francis Ford Coppola, plays jazz and pop oldies of the Big Band era, but K106-FM, KFRC's FM side, plays rock oldies, and that does not make it a rock station. Neither would KLPK-AM, San Jose's leader in the AM oldies field, be considered a rock station with its emphasis on MOR-oldies and current.
Around 1964, WABX in Detroit was the first "underground FM" station playing up coming tunes from the likes of Jimmy Hendrix, Cream and many other rock legends. In my circle of friends, I was the first to put an FM radio in my 62 Buick, using the Dave hafner circuit for the center dashboard speaker, and I became popular and introduced WABX FM to all my friends. Only 16 yrs old at the time!👍
 
At the risk of repeating myself and maybe going off topic, I really like the Hafler/DynaQuad system - it's cheap to implement and provides 1 surround sound "channel" from any stereo content.

I wish the speaker makers, back in the 1970s, had built a small speaker that fit the style of their larger speakers (same color grill cloth, same style woodgrain look) with a little Hafler/DynaQuad "decoder" box that could be sold for fairly low prices - IMHO, it could have helped get the average stereo listener accustomed to surround sound and might have been all that some listeners would ever have.


Kirk Bayne
 
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At the risk of repeating myself and maybe going off topic, I really like the Hafler/DynaQuad system - it's cheap to implement and provides 1 surround sound "channel" from any stereo content.

I wish the speaker makers, back in the 1970s, had built a small speaker that fit the style of their larger speakers (same color grill cloth, same style woodgrain look) with a little Hafler/DynaQuad "decoder" box that could be sold for fairly low prices - IMHO, it could have helped get the average stereo listener accustomed to surround sound and might have been all that some listeners would ever have.


Kirk Bayne
Speaker makers didn't do that, but many stereo stores did:

All of these are variants of the Hafler circuit:

Fisher 2+2
Lafayette Composer
Sanyo Decoder-4
Denon Dual Triphonic
Dynaco Dynaquad Quadaptor (Hafler designed)
Sylvania Phase Q4
Toshiba QM Acoustic Effect Simulator
Marantz Quadradial
Pioneer Quadralizer
H H Scott Quadrant
Magnavox Quadraplex
SSI Quadrasizer
Kenwood Quadrix
Panasonic Quadruplex
BSR QuasiQuad
Eico Quatrasonic
Realistic Quatravox (Radio Shack)

They were ubiquitous from 1971 to 1976. Most were under $20.

I built some that can decode all of the regular matrix systems.

uq-1-o.gif
 
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Speaker makers didn't do that, but many stereo stores did:

All of these are variants of the Hafler circuit:

Fisher 2+2
Lafayette Composer
Sanyo Decoder-4
Denon Dual Triphonic
Dynaco Dynaquad Quadaptor (Hafler designed)
Sylvania Phase Q4
Toshiba QM Acoustic Effect Simulator
Marantz Quadradial
Pioneer Quadralizer
H H Scott Quadrant
Magnavox Quadraplex
SSI Quadrasizer
Kenwood Quadrix
Panasonic Quadruplex
BSR QuasiQuad
Eico Quatrasonic
Realistic Quatravox (Radio Shack)

They were ubiquitous from 1971 to 1976. Most were under $20.

I built some that can decode all of the regular matrix systems.

View attachment 108582
Nobody cares about your ancient L pad circuits. No one today will build it. Especially the one that uses transformers and a light bulb in the rear channels . C'mon man. Move in to this century.
 
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Just a few days ago, I found in almost new condition books with electronic circuitry from the 20th century. I put them in a pile to throw in the paper recycling bin.

I was going to throw them away, but just couldn’t do it. Here are thick books full of wisdom and knowledge. I’m not likely to build anything, but I thought someone could learn something by reading them. So I’m going to donate them to Goodwill or another charity.

As for the future, who knows? I remember when CDs came out in the 1980s, people replaced their records with the new format. I asked what happened to their records, and more than a few friends said they threw them away. And now people are buying 180 gram vinyl and collecting records. I prefer digital, but still have my record collection. For me, IMHO, it’s not that one thing is necessarily better than the other, but each format can offer a unique experience to the music that the other doesn’t do.
 
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