[Iain Churches]

"Henry Pasternack" wrote in message
...
"John Byrns" wrote in message
...
You are making the wrong measurement, the relevant measurement for this
discussion is the input to the combination of the cutting amp and "RIAA"
equalizer vs. the amplitude, a.k.a. displacement, of the signal actually
cut into the grooves of the LP. I think that if you make this
measurement it will give you a different perspective on how LP records
actually work.

The train is leaving the station, Andre, Arny, Chris, Eiron, and Ian are
already on board, you wouldn't want to be left behind, you don't want to
have people thinking you have an incomplete knowledge of LP cutting. :-)

Hmmm. I guess I'll have to take the next train.

I agree that the shelf in the RIAA curve reduces HF groove amplitude by
about 12dB. On the other hand, there is nothing to prevent transcribing
discs with no cutting head equalization at all. The resulting discs could
be
played back flat with an unequalized phono preamplifier. Compared to a
flat system, equalization gives improved dynamic range and HF signal-to-
noise. This is precisely the purpose and definition of recording
"emphasis."

Hello Henry.

As I mentioned elsewhere this thread, I have the possibility
to cut such a lacquer in precisely the way you describe above,
with the record EQ switched flat. My colleagues in broadcast
seem mostly of the opinion that MM cartridge has a flat response,
and so replaying this disc with an inverter box in the chain to
cancel out the replay equalisation, will result in correct reproduction.

A benefit will also be the ability to cut a lot "hotter" without the
restriction of the rising HF curve in the recording. Total side
time will of course be greatly reduced as the LF will take up
more lateral.


Cordially,

Iain