Grace Design m501 500 Series Mic Preamlifier/DI
Presenting the m501, our 500 series module version of the venerable m101 mic preamplifier. Now the signature transparency and detail of our circuit designs is available for your 500 series collection.
While the 500 series market has plenty of colored mic preamplifier options, the natural, musical clarity of the m501 makes it a welcome addition to the field. This circuit is for engineers confident with the quality of the source, mic section and placement, and wish to capture it with as little coloration or distortion as possible.
The m501 module is a balanced, transformerles design, with 48V phantom, a 75Hz HPF and a 1/4” HI-Z instrument input. Also standard is our exclusive ribbon mic mode, which raises the mic input impedance, bypasses the input decoupling capacitors and deactivates 48V phantom to protect delicate ribbon mics from damage.
Large diaphragm, vintage ribbon or trusty dynamic - the m501 brings out the very best in any microphone and takes the guesswork out of your input chain.
Output trim control
0 to +10dB
THD+N 1kHz, 22Hz-22kHz BW@ 20dB Gain +20dBu out<0.00085%
@ 40dB Gain +20dBu out<0.0010%
@ 60dB Gain +20dBu out<0.0050%
INTERMODULATION DISTORTION @ 40dB Gain, +20dBu out
SMPTE/DIN 4:1 7kHz/50Hz
<0.0020NOISE - REFERRED TO INPUT @ 60dB Gain50Ω source<-130dB150Ω source<-128dB600Ω source<-124dBCMRR, @60dB Gain, 3.5Vcm100Hz >55dB1kHz >75dB10kHz
PHASE DEVIATION (HPF off)
50Hz-25kHz @40dB Gain<10
Mic input @ 40dB Gain -3dB
3.8Hz-288kHzMic input @ 40dB Gain -0.5dB 8.35Hz-135kHzHi-Z input @ 20dB Gain -3dB 1.7Hz-180kHzHi-Z input @ 20dB Gain -0.5dB 4Hz-72kHzIMPEDANCE
Mic input 8.1kΩMic input, Ribbon mode 20kΩHi-Z input (unbalanced)
Hi-Z input (balanced)
PEAK LED METER
MAXIMUM OUTPUT LEVEL
100k Ohm load, 0.1% THD , 1kHz, API Lunchbox27dBuWEIGHT and DIMENSIONS
0.7 lbH5.25 x W1.5 x D6.6
316gH13.34cm x W3.81cm x D16.75cmPOWER CONSUMPTION
Current required from +16V and -16V power supplies120mA Max