Re: Copying Op Amps to Make Mic Amps
- From: "Phil Allison" <philallison@xxxxxxxxxx>
- Date: Wed, 21 Mar 2007 11:38:42 +1100
"Eeysore"
Andy Peters wrote:
Anyways, I think the most obvious reason for differences in the sound
of mic preamps is simply the input loading. Change the input
impedance and how it reacts with a dynamic mic changes.
That's one of the ways. Any 'boutique' mic pre I may ever make will have
selectable input Z.
The other main things influencing their sound is transformer colouration
...
** The * PROBLEM * is that source impedance alters the HF response of the
transformer.
A given design may be "flat as a tack" with a 600 ohms mic as the source
but peak by 6 dB at some high audio frequency when changed to 200 ohms.
Then, if a modern condenser mic with say 20 ohms impedance is used, the HF
peak goes right off the wall.
Getting rid of that damn tranny was the best thing to ever happen to mic
pres.
........ Phil
.
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