The Grace Design m501 is a 500-Series version of the Grace Design m101 microphone preamp. It is natural, musical and detailed, allowing engineers and musicians to consistently record vibrant, amazing tracks.

The Grace Design m501 500-Series Microphone Preamp offers natural, musical clarity that 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 Grace Design m501 module is a balanced, transformerles design, with 48V phantom, a 75Hz HPF and a 1/4” HI-Z instrument input. Also standard is Grace Design's 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 Grace Design m501 brings out the very best in any microphone and takes the guesswork out of your input chain.

Grace Design m501 500-Series Microphone Preamp Features

• Fast and musical transimpedance architecture
• Precision audio path with 0.5% precision metal film resistors
• New 12 position gold plated rotary gain switch
• High performance output line driver amplifier and HPF amplifier
• New Ribbon mic mode (also great for dynamic mics) – Relay bypass of phantom power decoupling capacitors, increased input impedance, and 48V lockout
• Wide 10-75dB gain range
• Enhanced RFI interference suppression
• Bombproof laser-etched black anodized frontpanel
• Sealed gold contact relay for Hi-Z input switching
• Led indicators for +48V, Ribbon mode, and HPF
• Built in the USA

Grace Design m501 500-Series Microphone Preamp Specifications

• Gain Range (5dB Steps):
• • Mic Input: 10-65dB
  • Hi-Z Input: -10-45dB
  • 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: <0.0020
• Noise – Reffered to Input @60dB Gain 22Hz-22kHz BW:
• • 50O Source: <-130dB
  • 150O Source: <-128dB
  • 600O Source: <-124dB
• CMRR @60dB Gain, 3.5Vcm:
• • 100Hz: >55dB
  • 1kHz: >75dB
  • 10kHz: >65dB
• Phase Deviation (HPF Off):
• • 50Hz-25kHz @40dB Gain: <10
• Frequency Response:
• • Mic Input @ 40dBm Gain -3dB: 3.8Hz-288kHz
  • Mic Input @ 40dBm Gain -0.5dB: 8.35Hz-135kHz
  • Hi-Z Input @ 20dB Gain -3dB: 1.7Hz-180kHz
  • Hi-Z Input @ 20dB Gain -0.5dB: 4Hz-72kHz
• Impedance:
• • Mic Input: 8.1kO
  • Mic Input, Ribbon Mode: 20kO
  • Hi-Z Input (Unbalanced): 2.5MO
  • Hi-Z Input (Balanced): 5MO
  • Balanced Output: 300O
  • Unbalanced Output: 150O
• Peak LED Meter:
• • Green Threshold: -10dBu
  • Red Threshold: +16dBu
• Maximum Output Level:
• • 100k Ohm load, 0.1% THD , 1kHz, API Lunchbox: 27dBu
• Weight & Dimensions:
• • Weight: .7 lbs / 316 g
  • Dimension: H5.25 x W1.5 x D6.6 / H13.34cm x W3.81cm x D16.75cm
• Power Consumption: Current Required from +16V & -16V Power Supplies, 120mA Max

Grace Design m501 500-Series Microphone Preamp Includes

• Grace Design m501 500-Series Microphone Preamp
• 2 x #4-40 Hex Head Screws
• 1 x 3/32” Hex Wrench
• Anti-Static Bag
• 5 Year Warranty