Qx-949a
- Thread starter LGLDSR73
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NealinNevada
THE Bozak Museum of NV
There were two different quad receivers...the QX-949 was built from 1973-1976 and the QX-949A was built 1975-1979. With that said, they have the same output spec (40 watts/ch). See the sticky "Pioneer Component Database" at the top of this forum.
LGLDSR73
Member
That's what I had heard as well, but as you say I am unsure as to what those differences are. Thanks for your input!
The qx-949 had the first generation sq quadraphonic matrix system
The qx-949a had the "logic" second generation. Then there were others... ( sq's that is - it was a mess as I remember, far worse than vhs-beta)
This is what wikipedia (better than my memory) has:
SQ / Stereo Quadraphonic
Stereo Quadraphonic was a matrix quadraphonic system for vinyl. It was introduced by CBS in 1972, and record companies who adopted this format include: Angel, Capitol, CBS, CTI, Columbia, EMI, Epic, Eurodisc, Harvest, HMV, Seraphim, Supraphon and Vanguard.
The system was based on the work of Peter Scheiber, who created the basic mathematical formulae used to matrix four channels into two in 1970. SQ stands for "Stereo Quadraphonic." This system made good sense, as, in the absence of a quad decoder, SQ-encoded records would play as normal stereo records, and CBS stated their desire to maintain excellent compatibility between their SQ-encoded records and standard stereo systems.
The early SQ decoders could not produce more than 3dB of separation from front to back. Early "Logic" circuits were introduced to enhance separation to 20dB, but provided poor performance, very noticeable gain-pumping and an unstable 'swaying' soundfield. The SQ system also faced resistance from broadcasters since, while essentially a two-channel system and totally stereo-compatible, it could have substantial mono compatibility problems, which posed serious problems with all televisions and monophonic radios of the era. By the time that the most advanced logic system was introduced for SQ, the Tate Directional Enhancement System[2], "quad" was already considered a failure.
A Prologic II decoder will recover some of the surround sound information present in an SQ mix, as the matrices used are somewhat similar, but directional cues will not be properly located. Some of the SQ mixes are still present on CDs, especially on early, non-remastered editions, on which the original master is, in itself, SQ. (SQ is compatible with two-channel stereo, so there was no need to create a stereo version.)
The qx-949a had the "logic" second generation. Then there were others... ( sq's that is - it was a mess as I remember, far worse than vhs-beta)
This is what wikipedia (better than my memory) has:
SQ / Stereo Quadraphonic
Stereo Quadraphonic was a matrix quadraphonic system for vinyl. It was introduced by CBS in 1972, and record companies who adopted this format include: Angel, Capitol, CBS, CTI, Columbia, EMI, Epic, Eurodisc, Harvest, HMV, Seraphim, Supraphon and Vanguard.
The system was based on the work of Peter Scheiber, who created the basic mathematical formulae used to matrix four channels into two in 1970. SQ stands for "Stereo Quadraphonic." This system made good sense, as, in the absence of a quad decoder, SQ-encoded records would play as normal stereo records, and CBS stated their desire to maintain excellent compatibility between their SQ-encoded records and standard stereo systems.
The early SQ decoders could not produce more than 3dB of separation from front to back. Early "Logic" circuits were introduced to enhance separation to 20dB, but provided poor performance, very noticeable gain-pumping and an unstable 'swaying' soundfield. The SQ system also faced resistance from broadcasters since, while essentially a two-channel system and totally stereo-compatible, it could have substantial mono compatibility problems, which posed serious problems with all televisions and monophonic radios of the era. By the time that the most advanced logic system was introduced for SQ, the Tate Directional Enhancement System[2], "quad" was already considered a failure.
A Prologic II decoder will recover some of the surround sound information present in an SQ mix, as the matrices used are somewhat similar, but directional cues will not be properly located. Some of the SQ mixes are still present on CDs, especially on early, non-remastered editions, on which the original master is, in itself, SQ. (SQ is compatible with two-channel stereo, so there was no need to create a stereo version.)
