Guided Tour - Main Section
4: Stereo Auxiliary Return Level (gray) - These knobs determine the input
level of signal arriving via the MPL 1502’s two stereo Auxiliary returns. Each
return is at unity gain (no boost or attenuation) when set to the “0” (2 o’clock)
position. The input signal is boosted when the knob is turned to the right of “0”
and attenuated when turned to the left of “0.” For information on how to properly
set these, see the sections in this manual entitled “Setting the Correct Gain
Structure” and “Using the Aux Sends and Returns” (pages 14 and 20).
5: Stereo Auxiliary Return Balance (white) - These knobs determine the
relative levels of the left and right input signals connected to the MPL 1502’s two
stereo Auxiliary returns. When the knob is placed at its center (detented)
position, both left and right input signals for that Aux return are at equal strength.
When moved left of center, the left input signal remains at the same strength but
the right input signal is attenuated; when the knob is moved right of center, the
right input signal remains at the same strength but the left input signal is
attenuated. When placed fully counter-clockwise, only the left input signal is
heard (panned hard left); when placed fully clockwise, only the right input signal
is heard (panned hard right). These “radical” positions are useful when you are
using a stereo Aux return as two mono returns—see the “Using the Aux Sends
and Returns” section on page 20 for more information.
When only the left input of an Aux return is connected, its Balance knob
functions as a constant level Pan control, allowing you to continuously place the
incoming signal anywhere in the left-right stereo field.
6: Headphone Level (blue) - This knob sets the level of the signal sent to the
headphone jack (see #7 below). WARNING: To avoid possible damage to con-
nected headphones (or, worse yet, to your ears!), always turn this all the way off
(to the fully counterclockwise “0” position) before plugging in a pair of head-
phones—then raise the level
slowly while listening. The Headphone Level has
no effect on the final Main Mix output level.
7: Headphone jack - Connect any standard stereo headphones to this jack (via
a standard 1/4” TRS plug) for private monitoring of the main stereo output. The
built-in MPL 1502 headphone preamp delivers 150 mw at 30 ohms.
8: Main Mix (green) - This knob determines the final output signal level—you
can think of this as being the “master fader.” Signals from all channels and
Auxiliary returns are routed here just before leaving the MPL 1502 via its left and
right main output jacks. The center detented “0” position of the knob indicates
unity gain (no level attenuation or boost). Moving the knob counterclockwise
from the “0” position (towards “-∞”) causes the signal to be attenuated (at the
very bottom, it is attenuated infinitely—in other words, there is no sound).
Moving it clockwise from the “0” position (towards “+15”) causes the signal to be
boosted by as much as 15 dB. For more information, see the “Setting The
Correct Gain Structure” section on page 14.
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Audio Specifications
Weight and Dimensions
