Grace Design m501 500 series mic preamplifier
Grace Design m501 500 series mic preamplifier
Grace Design m501 500 series mic preamplifier
Grace Design m501 500 series mic preamplifier
Grace Design m501 500 series mic preamplifier

Grace Design m501 500 series mic preamplifier

Price
$675
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500 series module microphone preamplifier

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.

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
  • 20 year EON year warranty on parts and labor
  • Built in the USA

    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 - REFERRED TO INPUT @ 60dB Gain
    50Ω source <-130dB
    150Ω source <-128dB
    600Ω 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 @ 40dB Gain -3dB 3.8Hz-288kHz
    Mic input @ 40dB 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 8.1kΩ
    Mic input, Ribbon mode 20kΩ
    Hi-Z input (unbalanced) 2.5MΩ
    Hi-Z input (balanced) 5MΩ
    Balanced Output 300Ω
    Unbalanced Output 150Ω
    PEAK LED METER
    Green threshold -12dBu
    Red threshold +16dBu
    MAXIMUM OUTPUT LEVEL
    100k Ohm load, 0.1% THD , 1kHz, API Lunchbox 27dBu
    WEIGHT and DIMENSIONS
    0.7 lb H5.25 x W1.5 x D6.6
    316g H13.34cm x W3.81cm x D16.75cm
    POWER CONSUMPTION
    Current required from +16V and -16V power supplies 120mA Max

     

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