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The m501 from Grace Designs is a 500 series microphone preamp module, based on the company's m101 microphone preamp. While the 500 series market has plenty of colored preamp options, the natural, musical clarity of the m501 makes it a welcome addition. This circuit is for engineers who wish to capture their sources with as little coloration or distortion as possible.
The m501 module features a balanced, transformerless design, with 48V phantom, a 75Hz high-pass filter, and a 1/4" HI-Z instrument input. Also standard is a ribbon microphone mode, which raises the input impedance, bypasses the input decoupling capacitors and deactivates 48V phantom to protect delicate ribbon microphones from damage.
Single channel microphone preamp in the 500 series form factor
Fast and musical transimpedance architecture
Wide 10dB to 75dB gain range
Updated audio path with 0.5% precision metal film resistors
Sealed gold contact relay for Hi-Z input switching
Ribbon microphone mode (also great for dynamic mics) - relay bypass of phantom power decoupling capacitors, increased input impedance and 48V lockout
High performance output line driver amplifier and HPF amplifier
LED indicators for +48V, ribbon mode and high-pass filter
Laser-etched black anodized frontpanel
Made in the USA
In the Box
Grace Design m501 - Microphone Preamp
Five (5) Year Warranty
Table of Contents
Number of Channels
1 x XLR (on 500 rack) 1 x 1/4" TS phone Hi-Z Instrument (on module)
1 x XLR 1 x 1/4" TRS phone 1 x 1/4" TS phone
10dB to 75dB (including +10dB trim)
Maximum Output Level
27dBu (100kΩ load, 0.1% THD, 1kHz, API Lunchbox)
3.8Hz to 288kHz, -3.0dB, microphone input @ 40dB gain 8.4Hz to 135kHz, -0.5dB, microphone input @ 40dB gain 1.7Hz to 180kHz, -3.0dB, instrument input @ 20dB gain 4Hz to 72kHz, -0.5dB, instrument input @ 20dB gain
Referred to input @ 60dB gain: <-130dB with 50Ω source <-128dB with 150Ω source <-124dB with 600Ω source
120mA maximum current required from +16V and -16V power supplies
1.5 x 6.6 x 5.5" (38 x 168 x 140mm)
0.7 lbs (316g)
Ribbon microphone mode raises the input impedance, bypasses the input decoupling capacitors, and deactivates 48V phantom to protect delicate ribbon microphones from damage