Re: R-09HR, R-44 preamp comparisons

["John Lundsten" lundsten_john]

I have been doing a number of tests on the R44 & other stuff to hand.
 for more details from me and others see "Edirol R44" at


The EIN Equivalent Input Noise of in my case a 219Ohm dummy load resistor 
and without the typically used A weighting network are:--

R44               -111.25dB (at max gain, the most favourable EIN)
Fostex FR2     -124dB
Yamaha O2R     -126dB
Alice Matchamp +R44 (2)     -128.5dB

Note the input gain was such that a -45dBu signal (4.4mVolts) gives a 0dB 
Full Scale recording.
This being max gain for the R44 & less than max for the other 3, so the R44 
fig is flattering compared to the rest.
Re the difference A weighting may make
The R44 has less LF noise but it also has less LF response than the other 
mic amps
Simple filtering to get a 200Hz-24k passband improves the FR2 fig by a 
little over 1dB, I imagine the same would be true of the Yamaha & match amp 
figs.

John L