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Author Topic: preamp choice  (Read 1601 times)

luis Markson

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preamp choice
« on: July 11, 2011, 08:48:29 am »

Hi!

I've been posting over the Lab Lounge for a while but need some of your opinions.

As both a learning tool and as an attempt to improve the product I deliver, I am looking at purchasing an outboard mic preamp to use as part of a "money channel" for live use. My budget is tight but I think I have narrowed the choice down to the Grace Designs M101. From what I've read this pre is almost completely transparent.

By taking this approach I am hoping to learn something about the pres in the desks I use (mostly A&H GLs) rather than gain some kind of subjective sonic improvement. I also like the ribbon mode on the m101 as I am thinking about experimenting with a BeezNeez Judas at a later stage.

Does this sound like he right Pre choice for my purpose?
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John Roberts {JR}

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Re: preamp choice
« Reply #1 on: July 11, 2011, 11:29:35 am »

Hopefully others here will help guide your decision.

The m101 ribbon mode, bypasses phantom DC blocking caps, and raises the input impedance from 8 kOhm to 20 kOhm.

The best cap is no cap, so nothing wrong with bypassing them, if you are not using phantom power.

The normal 8k input termination is already a little higher than most mic preamps that target 10x bridging termination (1.5-2 kOhm nominal). The 20k is 10x higher than typical.

I don't want to overstate the influence of this. Moving to higher impedance will load the microphone's source impedance less for a little more output (a fraction of a dB better S/N). For heavy mass microphones there may be some subtle difference in damping but I don't expect as large of a sonic difference as you would see from using a lower than bridging terminations.

But again don't listen to my theory, listen to other people's hands on experience. maybe rent or borrow one and listen to the actual preamp.

JR 
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