On 10/28/2012 4:31 PM, Mickey Clark wrote:
> Hello - If the recording is monophonic, I choose the channel with
> highest/ clearest sound and mute the other . Unless you're prepared to
> adjust azimuth for each and every cassette, you'll find a "phase shift "
> issue when you combine the tracks for a monophonic final copy unless you
> process in this way.--Mickey Clark
In my experience it's necessary to adjust azimuth for every cassette no
matter what, even if you only use one channel; the high-frequency losses
from a misadjusted azimuth are just too great to be acceptable.
To briefly answer a couple of the OP's questions, a cassette recording
where everything is exactly right (azimuth, bias, record EQ, playback
EQ) is capable of response out to about 20-22kHz, -3dB, at a level 20dB
below Dolby standard level, but at higher levels the response is
drastically curtailed by high-frequency tape saturation. In general Type
2 and Type 4 tapes can produce slightly wider frequency response than
Type 1, again provided everything is done exactly right. It's not really
a matter of the compensation curve. 70us compensation does lower the
noise level compared with 120us, but transfers need to be done using the
compensation curve with which the cassette was recorded.
And yes, transfers should be done by professionals, or by people who
have been carefully trained by professionals. Knowing how to adjust
azimuth, and knowing when a tape needs to be transplanted to a new
shell, are skills that professionals have (or should have), and they
aren't easy to acquire in an afternoon.