Hi guys,
After some searching I found this very nice document:
http://www.geocities.com/ferocious_1999/md/sony_preamp.htm
It deals with the designs, and in short this is what it says:
- The preamp setting low gives a gain of 5.4 times
- The high setting gives a gain of 50 times.
[own remark: In both cases this is done by letting the same signal
go thru the same opamp, but with 1 resistor more or less in the
circuit. So overdriving the opamp will happen at the same SPL no
matter the switch position.]
- Models without a switch have a gain of roughly 25 times.
I haven't seriously tested the difference between the hi and low
setting, I will do it next week. But what is the reccommended setting?
I always thought it was best to record to about -6dB to -3dB. I try
having as little analog gain as possible, and having almost no
digital cutting (attenuation).
Because when you have a microphone preamp in a mixer (large studio
device type) it is common - recommended, I should say - to have the
fader at zero dB (no attenuation at the end of the chain), and have
the preamp setting with as little as pre-gain as possible (as little
gain as nessecary in the beginning of the chain)
This instead of a high gain at the beginning together with a high
attenuation at the end of the chain because this way the hiss and
noise is way higher then the first mentioned approach...
You might know that I always use the low gain setting of my MZR55 and
have the digital recording level almost always at 75% to 100%.
Is this approach wrong? (judging from what I have read last week I
tend to think it is wrong, but why?)
Should I use more analog gain and then digitally bring down the
recording level? Has anybody already tested this with results that
could be repeated by performing the same test based onm the test
procedures?
Regards, Evert
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