How Did They Do It

[gofar99]

Hi Everyone, I was poking through some vintage vinyl and listened to a Mono LP by the Limeliters (LMP-2844 RCA More of Everything). Yes I know not a current group . I left the system in stereo and was much surprised at the results. It sounded a lot like some of the much newer holographic stereo CDs! For sure my main speakers (Martin Logan Vista ESLs) do tend to emphasize spacial effects but this was well above the level expected. So what did RCA do on their Mono Dynagroove LPs? Anyone have some thoughts on this?

[megatrends]

I've no thoughts on that other than wow that rules!!!

[EdAInWestOC]

You are likely hearing the phase effects that your cartridge is picking up accentuated by the bipolar nature of your speakers. Try toeing in your speakers more or less or move the speakers further/closer to the adjacent walls.

I use Magneplanar speakers and ocassionally have the same experience. It depends on the LP and the boundary effects setup by the reflections from the back and front waves from the speakers.

It wasn't a mono LP but I have an old ABC Command Quad LP of Steely Dan Countdown To Ecstacy. There are parts of that LP where the instrument placement was quite a bit strange. I did not get that kind of effect back in the day I had a quad setup and I believe it is the room boundaries coupled with the out of phase info from that LP.

Since the LP you mentioned is mono makes it stranger but your cartridge is capable of generating out of phase info given the right circumstances.

Ed

[jake]

I think its something to do with microphone placement and the tube equipment they used. I also run esl speakers, and have found many beautiful mono records have so much depth to the sound stage you can fool many people into thinking it's stereo. Makes me understand the mono purists' point of view, especially when you hear the 80's records, with so many microphones and huge mixing boards the stereo effect is lost. A great stereo record can produce a super wide sound stage, but most stereo records are not engineered well enough to do so. Ray Charles insisted on five microphones at all times, even with big band, piano and Raylettes. He had golden ears.

[gofar99]

Hi, The LP was surprisingly clean sounding and was done in 1964. Another individual suggested that most likely as part of the enhancements in Dynagroove LPs RCA actually made the two channels slightly different and this might introduce the phase shifts mentioned in an earlier reply. Anyhow it was rather nice to listen to.

[Steerpike_jhb]

I wish I could find some Limelighters locally. I just love Glen Yarbrough's solo works.

[philbrown]

Hi Everyone, I was poking through some vintage vinyl and listened to a Mono LP by the Limeliters (LMP-2844 RCA More of Everything). Yes I know not a current group . I left the system in stereo and was much surprised at the results. It sounded a lot like some of the much newer holographic stereo CDs! For sure my main speakers (Martin Logan Vista ESLs) do tend to emphasize spacial effects but this was well above the level expected. So what did RCA do on their Mono Dynagroove LPs? Anyone have some thoughts on this?

It's a phase thing.
Phil Brown