User Manual

8
22500 USER REFERENCE MANUAL
- CONTROLS & INDICATORS -
LEFT INPUT TOGGLE SWITCH (MIC/INST) – The left channel has two input
connector choices: set LEFT INPUT to the down position for the ¼” instrument
input jack or set to the up position for the XLR microphone input.
MIC TRIM Knob – The MIC TRIM knob allows you to fine tune the gain of the
XLR MIC input jack. The maximum gain available at the MIC TRIM knob is
+27dB. Normally it is best to start with MIC TRIM at its maximum setting.
PHANTOM POWER TOGGLE SWITCH (ON/OFF) – when set to the upper,
ON position, phantom power is applied to the XLR MIC input jack. Set to the
down position to disable phantom power on the microphone input. CAUTION:
please ensure your microphone can withstand phantom power (+45VDC) before
setting this switch to the ON position. In particular, phantom power is known to
possibly damage ribbon microphones.
INPUT GAIN Knob – The INPUT GAIN knob sets the overall gain for both the
LEFT and RIGHT inputs equally. INPUT GAIN also sets the output level of your
dry signal at the output jacks. Ideally you would turn up INPUT GAIN until you
see the CLIP LEDs light briefly and then reduce the INPUT GAIN slightly. If you
need more output level for the dry signal do not be afraid to turn up the INPUT
GAIN knob. The maximum gain available at the INPUT GAIN knob is +14dB.
Unity gain for the ¼” inputs is located at about 11 o’clock on the INPUT GAIN
knob.
When the LEFT INPUT switch is set to MIC, the MIC TRIM knob on the rear panel
first sets the microphone’s gain, and then the INPUT GAIN knob further adjusts
the gain. If you attach both a microphone and a Right input, use MIC TRIM to
match the microphone’s level to the Right input. Then use INPUT GAIN to set the
input volume for both channels.
CLIP L & R LEDs – When an input signal’s amplitude exceeds the maximum
input level of the 22500’s A/D converter, the channel’s respective CLIP LED
briefly lights up. Aim to adjust the INPUT GAIN knob so that these LEDs barely
ever light. However it is also not wrong if they light consistently. Let your ears
decide if there is audible distortion. If distortion is present and it doesn’t sound
right, turn down the INPUT GAIN knob.
LOOP A & LOOP B Knobs – These two knobs set the output volume for their
respective loops. The LOOP A knob adjusts the output volume for Loop A at all
times and the LOOP B knob adjusts the output volume for Loop B at all times.
These knobs are always live and are not saved with loop banks.
REC LEDs for LOOP A & LOOP B
– These red LEDs, along with the PLAY and
MEM LEDs, give a visual indication of each loop’s current activity.