m
101
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to ground. While this will not cause damage to the preamplifier, it can cause unwanted distortion in the unbal-
anced signal.
BALANCED XLR OuTpuT
Balanced XLR line output connector. This output is wired pin 2 positive, pin 3 negative and pin 1 ground.
MICROpHONE INpuT
For connecting a microphone to the m101. This connector is wired pin 2 positive, pin 3 negative and pin 1
ground. 48V phantom power, if used, is supplied on pins 2 and 3.
The Disconnect Device for the m101 is the Mains plug or the Appliance Coupler on the power supply
cord. The Disconnect Device must remain accessible and operable.
INSTRuMENT AND LINE INpuT
Instrument and line level signal connections are made using the ¼” TRS jack on the front panel. This connector is
balanced with the tip positive, ring negative and sleeve ground.
TRIM
GAIN
ribbon
HPF
48V
HIZ
10dB
65dB
0dB
+
10dB
Using the instrument input with an unbalanced source is simple if a mono ¼” jack is
used, since the sleeve will automatically ground the inverting input (ring) when
plugged in.
When a plug is inserted into the instrument input, a sealed gold contact relay
switches the preamplifier input source from the rear panel mic input connector to
the front panel TRS jack. The input impedance of the instrument input is 1M Ohm
unbalanced and 2M Ohm balanced, which is ideal for inserting high impedance
sources such as guitars with passive pickups, as well as any instrument with a high
level output. Please note that the gain range of the preamplifier when using the
instrument input is –10dB to +55dB.
operatInG tHe m101
BASIC OpERATION
Turn the gain and trim controls fully counter-clockwise and check that the +48V phantom power is off. Connect
the microphone to the preamplifier and then turn on the phantom power switch on if required. When sending
a signal to a recorder that has fixed input levels, simply increase the gain until the optimum recording level is
reached.
When sending a signal to a recorder with a variable input, set the record level control on the recorder to 12
o’clock or midway between minimum and maximum, then set the gain on the m101 until the optimum record-
ing level is reached.
NOTE: It is important to observe proper microphone power sequencing when using phantom powered mics. Al-
ways make sure that the +48V phantom power is turned off and discharged before connecting or disconnecting
a microphone. The red +48V LED indicates the presence of voltage at the microphone input connector. It will go
out when the +48V supply is sufficiently discharged.
