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Quadrophonic


MrPin
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I've just plugged a turntable in after many years. There's a bit of a problem with it, but that's for another thread.

An old Steely Dan record is marked as QUADROPHONIC. Apparently these are worth more, though I doubt many have the equipment to hear the effect.

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Bobthebuilder

My wife inherited a load of vinyl off her Dad. Lots of mono Beatles stuff, personally I think it sounds better than stereo records.

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IIRC, with some quad recordings you can copy to tape and the quad effect remains and will decode properly when played back through a decoder, while with others if you record to tape you lose it and the front/back channels are forever mixed together.

I can't recall why, exactly.  

I also recall that quad records were sometimes called CD.  But weren't compact discs.  This would have been confusing if the two technologies weren't firmly stuck in different decades.

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I've got a quadrophonic amplifier that's on long term loan a mate.

afaik, it works by detecting a phase difference in the recording. Most of the sound goes to the front speakers and anything out of phase goes to the rear speakers.

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7 minutes ago, jm51 said:

I've got a quadrophonic amplifier that's on long term loan a mate.

afaik, it works by detecting a phase difference in the recording. Most of the sound goes to the front speakers and anything out of phase goes to the rear speakers.

There's also another way to do it, which involves using a higher frequency difference signal superimposed on the original audio. 

 

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On 09/11/2021 at 11:16, dgul said:

There's also another way to do it, which involves using a higher frequency difference signal superimposed on the original audio. 

 

That was CD-4.

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27 minutes ago, MrPin said:

That was CD-4.

Thanks -- you're right.

I recall meeting with a sound engineer in the 90's who said that for the most part people don't really like stereo and that they appear to be more contented with a well set up monophonic system.   I suppose that might be why people didn't go for the 'double the number of speakers again' option.

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Erewhon888

In 1970 I heard an Ambisonics demo somewhere near Heathrow and have never heard anything as immersive and impressive since. I assumed it had died long ago but just looked on Wikipedia and apparently it may be making a comeback. Time to reinvestigate.

https://en.wikipedia.org/wiki/Ambisonics

Quote

Since its adoption by Google and other manufacturers as the audio format of choice for virtual reality, Ambisonics has seen a surge of interest.[27][28][29]

In 2018, Sennheiser released its VR microphone,[30] and Zoom released an Ambisonics Field Recorder.[31] Both are implementations of the tetrahedral microphone design which produces first order Ambisonics.

A number of companies are currently conducting research in Ambisonics:

Dolby Laboratories have expressed "interest" in Ambisonics by acquiring (and liquidating) Barcelona-based Ambisonics specialist imm sound prior to launching Dolby Atmos,[37] which, although its precise workings are undisclosed, does implement decoupling between source direction and actual loudspeaker positions.

 

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  • 2 weeks later...
Percy Hotspur
On 08/11/2021 at 09:48, MrPin said:

I've just plugged a turntable in after many years. There's a bit of a problem with it, but that's for another thread.

An old Steely Dan record is marked as QUADROPHONIC. Apparently these are worth more, though I doubt many have the equipment to hear the effect.

Dobly is the future, Mr Pin. Every Spinal Tap album was in Dobly. Now THEY were a decent band.

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