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Topic: 6 Track Magnetic vs 6 Track Digital

Tom Petrov
Five Guys Lover

Posts: 1121
From: El Paso, TX
Registered: Jan 2003

posted 03-28-2011 02:52 AM

Can one of you experts comment.

Am I correct here.

Is channel LC/RC of six track mag low frequency. I was under the impression that starting with Close Enounters, the LC and RC tracks contained low frequency effects.

Star Was EP I did not.

Is this correct?

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Louis Bornwasser
Film God

Posts: 4441
From: prospect ky usa
Registered: Mar 2005

posted 03-28-2011 04:55 AM

That was the Dolby version of 70mm and everything that conformed to that standard would be "Baby Boom" on those channels.

Many, many earlier 70mm films channel 2/4 were only just a mix of L/R and center. Once I determined this to be true, I switched off the channel 2/4 amps when running 70mm; seperation improved, especially in long/narrow cinemas. Louis

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Rick Raskin
Phenomenal Film Handler

Posts: 1100
From: Manassas Virginia
Registered: Jan 2003

posted 03-28-2011 06:31 AM

At my age it all sound good to me. It would be a blessing to be able to tell the difference. [thumbsup]

Thanks Bobby for the clarification of sample rate and bit density.

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Bobby Henderson
"Ask me about Trajan."

Posts: 10973
From: Lawton, OK, USA
Registered: Apr 2001

posted 03-28-2011 11:02 AM

quote: Louis Bornwasser
That was the Dolby version of 70mm and everything that conformed to that standard would be "Baby Boom" on those channels.

Dolby's Format 42 "Baby Boom" was by far the most used arrangement on 70mm prints from 1977 up to the end of the 1980s. The 5.1 channel Format 43 was interesting in how it was backward compatible with Format 42. The three stage channels were full range. But cross over filters separated the mid/high range audio and sub bass of the other three channels. Format 42's two "baby boom" sub bass channels held the split-surround audio of Format 43 and then the one sub-bass channel in Format 43 had the mono-surround audio for Format 42. The only drawback with this approach is you couldn't have full range speakers in the surrounds, but very few theaters had that anyway. I think most surround speakers being installed in theaters even today are limited to mid/high range.

Digital surround sound formats can have full range surrounds, although lossy DTS theatrical used limited range surrounds and encoded the sub-bass audio into those channels.

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Louis Bornwasser
Film God

Posts: 4441
From: prospect ky usa
Registered: Mar 2005

posted 03-28-2011 07:51 PM

Bobby: the bass for the surrounds was stripped from ch 6 (mono surround). This was added to the ch 2/4 mid highs for the l/r split surrounds. The bass was non-directional (for the most part) anyway.

Known around here as Max Bell's format. louis

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