Grace Design m501

MPN #m501

$1035.00

Save 12.4%, MSRP $1182.00

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Single channel preamp for 500 series racks

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 ¼" 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

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