pfarrell;311377 Wrote: > > None of the 2" machine had much frequency response above 20kHz. Most > didn't have any, but it hard to generalize. Most used Dolby or > something like it, long before Dolby became popular in the mass > market. > > If the tracking was done on a typical Struder 2" machine with Dolby, > there isn't much pure signal about the 20kHz that red book can cover. > And Dolby processing is audible if you pay attention and have good > gear.
Gothca there, Pat. I had a 2" Studer A800 24-track and consistently measured its response at ±2dB 42Hz-23kHz. It would be about -6dB @ 25kHz. The reason for the weird low-end @ 42Hz was due to the AES curve for 30-inches-per-second tape speed. Vinyl wasn't real keen on a lot of activity below 50Hz, so the AES (Audio Engineering Society) decided to roll it off slowly below that. Most of the time we didn't use Dolby Noise Reduction on the multi-track tape since the console had dynamic automation. This allowed us to turn tracks off, or volume down, when nothing was playing on that track. With some 'smart' mixing, you could all but lose the tape hiss. Also, at 30IPS the octave of the tape hiss 'shifted' upwards in the spectrum as opposed to 15IPS, making it not so obvious to hear. We would use Dolby SR on our 1/2" 2-track mixdown masters since you didn't have the option of 'losing the hiss with a fade-out' like you did on the multi-track. I did a LOT of vinyl (lacquer) mastering in the late 70s and early 80s. It was an INCREDIBLE time for the music industry back then. ----- sorry for the extended history lesson, guys. -- Eric Seaberg Eric Seaberg - San Diego - [EMAIL PROTECTED] ------------------------------------------------------------------------ Eric Seaberg's Profile: http://forums.slimdevices.com/member.php?userid=7896 View this thread: http://forums.slimdevices.com/showthread.php?t=48748
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