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3.2 BUSS MASTER
MODULE
BUSS IN JACKS
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tnput
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These two R.C.A, Jacks allow you to add a signal or
group of signals to the input of the Buss Master Module
and
route
them
on
to another
circuit,
if necessary.
Because this connection
acts in the same fashion as an
external "Y" cable, care must be taken in calculating the
true load,
The output feeding the "Y" will be affected
by the total load of both connections. The Buss In input
load impedance is 10k ohms.
Find the input load im-
pedance
for the
second
connection
and
see Page' 3,
impedancé matching, for the appropriate formulas.
10 Buss master
BUSS
TRIM
Like the trim on the first gain stage of the 1st input
module. When the overall level on the buss becomes too
high, distortion can be induced in the summing amplifier.
Reducing the setting of the Straight Line Master will not
help. Turning this "Trim" control counterclockwise will
lower the gain and increase the headroorn
of the sum-
ming amplifier, In extreme cases, it may be necessary to
reduce the level of each input fader. The maximum gain
reduction
provided
by the "Trim"
control
is approxi-
mately 20 dB. The
normal
position
is fully clockwise.
ACC
SEND/RECEIVE
JACKS
Provided
for signal processing of the entire Buss
Output,
The Jack pair is not connected internally and a
jumper
or a device must
be completely
connected
for
signal to flow to the next stage. The output toad imped-
ance
of the Send
Jack
is 1.4kohms.
The input load
impedance of the Receive Jack is 10k ohms.
This signal path (in and out) is located behind the
Buss Master Fader. The action of a limiter or compressor
action will not be affected by moving the Buss Master
Fader, but will be affected by "Trim." At this point in
the circuit we
have
a complete
Buss Master Mix.
All
functions of the input module will affect the signal here,
all major and minor patch points are behind us, and as
far as the recorder is concerned, the signal is ready to
record — we are done, The only problem job remaining
is: how do we hear what we are doing? This signal must
go to Our monitor circuits. So, we put an internal con-
nection here to one side of a switch:
MONITOR
A SELECT
and,
also to MONITOR
B SELECT
BUSS MASTER
FADER
This fader contro!s the overall level of signals from
the input modules and the echo receive section. When
Buss is selected, echo receive signal enters the signal path
here. Other functions of the echo assign buttons enter
the monitor at leter points in the circuit,
See Page 9,
Buss Master Module.
TAPE AS SOURCE
There are two switches that seem
to do the same
job, feeding signals to the monitor system, This apparent
doubling
of function
is provided
for several
reasons.
Even though the M-15 has only 8 Buss Master Modules,
it has a 16 track monitor system,
Setting the monitor
select switch to the left selects "Buss Master Output" as
a signal.
Re-setting to the right most position will now
select "Tape" as a monitor, and we need sixteen posi-
tions to monitor the playback of all sixteen tracks.
Because of this 16 track monitor requirement, all moni-
tor controls are doubled and there are two apparently
identical sets of controls.
When
used as "Buss Master"
monitor
they become
redundant,
but the two sections
are not identical in "Tape" mode. Monitor section "A"
is connected only to Tape in A, and monitor section "B"
only to Tape in B.
BUSS AS SOURCE
tf our basic 16 track setup on Page 13 is used, you
will get a different track on each section of the monitor
or Buss Master Module (one for each),
Monitor "A" tape
select will be track 1, Monitor B tape select will be track
9. Both Monitor A and B will see Buss Master 1 when
Buss Out is selected by their Monitor Select Switches.
However, this switch does not control the logic of signat
selection for the Aux 3 or 4 circuits immediately above,
it only works on the straight line fader marked "Mon
Gain" below it. We have provided each section of our
monitor with an output RCA Jack on the back that can
be regarded as an 8 x 2.stereo mix in itself. When using
the M-15 with an 8 track recorder, a great deal of flexi-
bility in monitoring becomes
possible for a standard
8
track setup. See Page 13.
MONITOR
PAN
The Monitor Pan affects only the monitor mix.
It
will not alter the level or pan position on the Buss Master
Output when input panning is done between two busses,
but if both-selected
busses are monitor panned
to the
same side in your stereo monitor mix, turning the input
pan control will produce no audible result. Input panning
will, in fact, affect what you record, but you won't have
ct
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