grace design m201
mk2
owner’s manual
6
FUSES
The m201mk2 uses two T250mA 250V~ 5mm x 20mm Time Delay Fuses.
MOUNTING
The m201mk2 can be rack mounted in a standard 19” equipment rack and does not require any extra
ventilation. 4 Rack screws are included in the box.
AUDIO CONNECTIONS
Microphone input connections are made via female XLR connectors with pin 2 positive, pin 3 nega-
tive and pin 1 ground.
Note: This will provide a signal of positive absolute polarity when the preamplifier
is being used with a microphone which produces a positive voltage on pin 2 with positive air pressure on
the front of the diaphragm. While a vast majority of microphones conform to this standard a few do not.
Use the phase reverse switch to compensate if necessary.
48V phantom power is supplied on pins 2 and
3.
Output connections are made via male XLR connectors with pin 2 positive, pin 3 negative and pin 1
ground. If the output is to be used unbalanced, pin 1 should be connected to signal ground and pin
2 to signal hot. Due to the nature of the balanced output stage, pin 3 should be left open for unbal-
anced operation. See the following
figure 1
.
1
2
3
SHIELD
HOT
GND
(OPEN)
XLR MALE
figure 1
- Unbalanced output cable termination
Preamplifier Operation
SETTING THE GAIN
First, turn the gain control fully counter-clockwise and check that the +48V phantom power is off.
Connect a microphone and then turn on the phantom power if required. When sending a signal to a
recorder, converter or interface that has fixed input levels, simply increase the gain until the optimum
recording level is reached. If the peak indicator flashes red excessively with the gain control in the
fully counterclockwise position, engage the -20dB attenuator.
When sending a signal to any recording device with an input attenuator, use the following procedure:
With the sound source present, turn the gain control clockwise until the peak LED begins flashing
red, then reduce the gain until the red stops flashing. Since red indicates a peak level which is 12dB
