Audio Connections; Power Connections - Grace M201 Owner's Manual

Audio Connections

Microphone input connections are made via female XLR connectors with pin 2 positive, pin 3 nega-
tive and pin 1 ground. 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 unbalanced operation. See
<figure 1> below. Note: This will provide a signal of positive absolute polarity when the preamplifi-
er is being used with a microphone which produces a positive voltage on pin 2 with positive air pres-
sure 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.
1
2
3
(open)
<figure 1> - Unbalanced output cable termination
To connect to the front panel HI-Z input, the input mode selector switch must be positioned in the
"HI-Z" location, which changes the preamplifier input source from the mic input connector to the
front panel TRS jack. The input impedance of the instrument input is 2M Ohm (balanced) and 1M
Ohm (unbalanced), which is ideal for inserting high impedance sources such as guitars with passive
pickups as well as any instrument with a high level output. Wiring of the HI-Z jack is Tip positive,
Ring negative, and Sleeve ground. Please note that the gain range of the preamplifier when using
the instrument input is –2dB to +48dB in 2dB steps.

Power Connections

A standard three prong AC power cable is included with the m201. For safety,
the power supply cord must be connected to a grounded outlet.
The Disconnect Device for the m201 is the Mains plug or the Appliance Cou-
pler on the power supply cord. The Disconnect Device must remain acces-
sible and operable
CHECK LINE VOLTAGE SETTINGS
Your m201 has been set from the factory to operate at the voltage required for your part of the
world. However, it's important to double-check this in order to ensure no damage will come to the
unit if power is applied while the setting is incorrect.
AC input voltage settings can be adjusted for 100V, 120V, 220V, 230V and 240V operation at 50-
grace design m201
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owner's manual
HOT
GND
SHIELD