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EQUALIZATION
CONTROLS
The M-15 has 6 frequency, 4 control E.0. divided
into two sections of two knobs each. On the upper sec-
tion,
1OKHz
fixed,
3kHz
or 5k Hz switch selectable.
On the lower section, 200 Hz or 800 Hz, switch selectable,
and 75.Hz, fixed. The fixed frequency controls will not
work
unless their frequency select switch is away from
the center, or
"EQ OFF"
position.
Either side will do
but center
is "OFF"
for both knobs in a section. The
chart below shows
the range for each frequency, boost
and cut.
DIRECT OUT
6) (101
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soLo
AUX
1 AND
AUX
2 PRE-/POST-FADER
FUNCTION
Both of these Auxiliary Mixing Positions can be fed
from. more
than one point in the signal path..To make
their operation
clear we'll
use a section of the Biock
Diagram
to
show
the connections.
Since there
is no
switch,
the
direction
of rotation
of the control
will
determine
which
point signal will be derived from.
Counterclockwise (leftwards) rotation of either the Aux
1 or Aux
2 control
will draw. signal before the input
fader. if you choose this source, moving the input fader
will not affect the level of your Aux Mix. This is useful
for making up cue mixes for musicians. Nothing is more
frustrating to a player than having the drums suddenly
disappear from the earphone mix during rehearsal. Clock-
wise (rightwards) rotation of either the Aux
1 or Aux 2
control will draw signal after the input fader.
This source
is useful for echo mixes. As the input fader is closed, the
echo send
will also be reduced, "fading out" will not
leave you with a "ghost" coming from your echo return.
Each control has a detent you can feel at "center"
allowing
you
to be sure
it is completely
"OFF"
and
drawing no signal from either side.
PRE,
PosT
Rotate CCW
(left) to increase
Rotote CW
(right) to increase
oN
ON
This type of control is called a'"W" pot. Its use in
the M-15 allows us to eliminate a switch that would
otherwise be necessary to select "pre" or "post". Both
circuits may be set to the same side safely, either pre or
post. You may have 2 postfader echo sends or 2 pre-
fader cue systems or one of each as the needs of the
moment
require.
Because of slight differences
in func-
tion on the master
control
of each circuit, we suggest
that you use Aux 1 as your input cue, and Aux 2 as an
echo circuit, but this is basically a recommendation not
@ command.
The reasons will become
more clear when
we describe the final controls for each function.
(See
"Aux A Module", "Aux B Module" Pages 9 and 10).
INPUT
FADER
Controls the signal level of all prior stages. Faders,
also called pots or attenuators always cause loss in order
to control signal level. Gain stages in an electronic device
always run "wide open" at whatever gain they are set
for, unless they have provision for "Trim" or actual gain
adjustment. In the M-15 only two of the many amplifiers
employed
actually have "Trim", the first gain stage or
Mic Pre and
the Buss Summing
amplifier.
When
you
advance any straight line fader on the M-15 you are just
reducing the loss it causes. The entire signal flows to the
next stage only if the fader is "wide open". or up all the
way.
DIRECT OUT JACK
There is no special control for this output on the
top panel.
It is "Hot" all the time, and provides an un-
mixed single signal output of whatever has been assigned
to the module. This direct ouput can be used for a variety
of purposes.
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