« Reply #4 on: January 22, 2007, 01:08:45 PM »
Is the PIP (plug-in power) on the Edirol R-09 sufficient for the AT micros?
Has anyone attempted this in higher SPL concert settings?
How about acoustic performances near stage?
Dang, does the thought of a high-quality, all-in-one pocket recorder seem tempting!
If you do the mod I do for these mics you can go straight in my Friend recorded the WHO 5th row with my cardioids no battery box or preamp and 0 distortion. So yes it can be done just not with the way these mics come stock. You have to put in a 4.7k resistor between the Red wire and ground when your going 2 wire.
Hey Chris. Someone probably posted this already, but do you know the PIP voltage the R09 produces?
Richard
I think its like 2.5 or something like that. From my tests and this is going to sound nuts, but bias voltage has little effect on the amount of SPL and lack of distortion that a mic will handle. My tests between 10volts and 2.5 volts produced very little difference in the way of increased headroom from increased voltage.
Chris Church
Nice. I've tried to power some mics off of Minidisc plug-in-power and it is hit and miss. They will work, but you have to be careful that the voltage drop across the resistor is not too high (otherwise there is not enough voltage left for the FET). Aim for something like 0.75V or even 0.5V. The resistor depends on the quiescent (idle) current through the FET. For AT853 type mics, the current is approx 0.1 to 0.15mA. So, a 4.7k resistor will give approx 0.5V drop, which is perfect. I'll have to try this
.
Richard
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Mics: Sennheiser MKE2002 (dummy head), Studio Projects C4, AT825 (unmodded), AT822 franken mic (x2), AT853(hc,c,sc,o), Senn. MKE2, Senn MKE40, Shure MX183/5, CA Cards, homebrew Panasonic and Transsound capsules.
Pre/ADC: Presonus Firepod & Firebox, DMIC20(x2), UA5(poorly-modded, AD8620+AD8512opamps), VX440
Recorders: Edirol R4, R09, IBM X24 laptop, NJB3(x2), HiMD(x2), MD(1).
** This individual has moved to user "illconditioned" **