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HomepageMic Preamps500 Series Preamps › Grace Design m501
Grace Design m501

The Grace Design m501 is our 500 series module version of the venerable m101 mic preamplifier. The signature transparency and detail of our circuit designs in 500 series.

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
  • Three output connectors: XLR balanced, TRS balanced and ΒΌ" unbalanced
  • Bombproof laser-etched black anodized frontpanel
  • Sealed gold contact relay for Hi-Z input switching
  • Led indicators for +48V, Ribbon mode, and HPF
  • 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
    50 source : <-130dB
    150 source : <-128dB
    600 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 : 8.1k
    Mic input, Ribbon mode : 20k
    Hi-Z input (unbalanced) : 2.5M
    Hi-Z input (balanced) : 5M
    Balanced Output : 300
    Unbalanced Output : 150

    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
    Reviews
    Price *
     
    $970.00
    Free shipping in Canada. Conditions
    Rental
     
    Price/Day
    Total
    1 Day
    $21.00
    $21.00
    3 Days
    $14.00
    $42.00
    5 Days
    $10.50
    $52.50
    12 Days
    $7.00
    $84.00
    28 Days
    $4.50
    $126.00
    Additional information
    For more information about the m501, please visit the website of Grace Design
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