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Re: iRig pre

Subject: Re: iRig pre
From: "Avocet" madl74
Date: Sun Nov 25, 2012 9:21 am ((PST))
Can you clarify what you mean by the input stage


I don't know the circuit of the iRig, but the greatest noise would
come from the amplifier handling the lowest signal levels.

A typical chain for a powered mic is: Mic capsule - mic pre-amp -
cable - control device/base cut etc - recorder input amp - digitiser
circuit. Every step of that chain adds noise but should raise the
level, so the first pre-amp is most likely to add the most noise.
Every stage will add noise, even the cable, but if the level is higher
in each stage, the relative noise level will be lower. That is why I
am suggesting running the first stage at a higher level setting but
short of overloading.

> the next stage is to record some silence with various settings, both
> on the iRig and LS-10.

That will be interesting. Take a note of all the settings and also do
a similar run with a sound source as I suggested to provide a common
reference to the noise figures. Noise levels have to be refereed to a
known common sound level.


David Brinicombe
North Devon, UK
Cogito cogito ergo cogito sum - Ambrose Bierce

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