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Originally Posted by stijn
Last weekend, I had the chance to borough a ECM-MS907 from a friend. It gave me exaclty the same result as the ATR25 which I have. As Sinamit is saying any pickup is overpowered by the circuitry noise, at low recording sound volumes. They both have virtually the same spec in terms of impedance (1K Ohm) and sensitivity (-54Db).
Cheers,
Stijn
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The problem is not in the impedance, but in the integrated mic preamplifier: it's noisy for low level input signals. A high quality mic preamp is not very expensive (2 transistors, 1 double opamp, some resistors and capacitors), but commercial devices don't have them. Their pre are made only of a high sensitivity input in a "big" chip...
I have tested a very simple pre, powered by the Iriver's phantom, with only a transistor per channel. It has a gain of +14dB (5x), giving a similar amount in the signal/noise ratio improvement.
Wait for a tinypic photo of the schematic...