page 5
model
101
owner’s manual
preamplifier connections
OUTPUT CONNECTIONS
are made using the male XLR connector or the ¼” TRS jack. The
XLR connector is wired with pin 2 positive, pin 3 negative and pin
1 ground. The ¼” TRS connector is balanced with the Tip positive,
Ring negative and Sleeve ground. The XLR and TRS outputs can be
used simultaneously.
It is important to note that if either of the outputs are to be used
unbalanced, a modified cable is required (see cable diagram 1
and 2 on page 7). It is not recommended to use an unbalanced ¼”
plug in the TRS output jack, because the sleeve of the unbalanced
plug will short the inverting output amplifier to ground. While this
will not cause damage to the preamplifier, it can cause unwanted
distortion in the unbalanced signal
INSTRUMENT AND LINE INPUT
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.
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 mic
input connector to the front panel TRS jack. The input impedance
of the instrument input is 1M Ohm, 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 +40dB.
MICROPHONE INPUT
connections are made using the female XLR connector on the rear
panel. This connector is wired with pin 2 positive, pin 3 negative
and pin 1 ground. 48V phantom power, if used, is supplied on pins
2 and 3.
6VDC 800mA
GRACE DESIGN
BOUDLER, CO
MADE IN USA
BALANCED
OUTPUTS
FOR UNBALANCED
OUTPUT PIN 3 (RING)
MUST BE OPEN
PUSH
MIC
INPUT
POWER SUPPLY
A 2.1mm jack is used for the DC power input of the
101. The polarity of the jack is positive in the center
and ground on the outside. Included with your Model
101 is an AC adapter rated for 6VDC @ 800mA
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