Assign; Oscillator Section; 400Hz/Pink Noise; Level - Mackie SR40.8 Owner's Manual

ASSIGN

Point Before: TALKBACK switch
Point After: (per switch): AUX 1–4, AUX 5–8,
EXTERNAL, L/R, MATRIX A, MATRIX B,
MATRIX C and MATRIX D.
Engage the switches for locations you want
to receive TALKBACK (or OSCILLATOR) sig-
nals. For instance, if your stage monitors are
being fed by AUX SEND MASTERS 1–4 and you
want to talk to the talent, leave the AUX 1–4
switch engaged, and toggle the TALKBACK
switch on and off as needed.
You can use the EXTERNAL switch to de-
liver the TALKBACK (and OSCILLATOR)
signal to a second console, such as a monitor
console. Simply patch from the FOH (front-of-
house) console's TALKBACK
line-level Channel input of the monitor con-
sole. Then use that Channel's aux sends to
deliver the TALKBACK signals to the stage
monitors.

OSCILLATOR SECTION

The SR40•8's TALKBACK signal may be re-
placed by either of two on-board sound sources
— a 400Hz sine wave for checking levels, or a
PINK NOISE generator for quickly checking the
frequency response of your amp/speaker systems.

400HZ/PINK NOISE

Point Before: 400Hz and PINK NOISE oscillators.
Point After: LEVEL (OSCILLATOR)
With the switch up (disengaged), the oscil-
lator delivers a 400Hz sine wave, typically used
for calibrating and matching levels with exter-
nal devices. With the switch down (engaged),
it delivers a modified PINK NOISE. PINK
NOISE is used for performing quick frequency
response checks.
If your talent is performing that Beatles'
classic, "I Want You (She's So Heavy)," you can
use the PINK NOISE along with the oscillator
LEVEL control to emulate that horrendous
ocean sound that builds up and takes over
towards the end.

LEVEL

Point Before: 400HZ/PINK NOISE
Point After: ON (OSCILLATOR)
This controls the signal level of all OSCIL-
LATOR signals, be it the 400Hz sine wave or
the PINK NOISE generator. The signal is off
when turned fully counterclockwise, with
plenty of gain turned fully clockwise.
In 400Hz sine mode, you may want to send
out a calibrated level (via the TALKBACK
output to a
ASSIGN switches.) To do this, engage the ap-
propriate ASSIGN switch, then engage one
SOLO switch in the selected circuit.
For instance, to calibrate while sending out
to AUX SEND MASTER 1–4, engage the
TALKBACK ASSIGN: AUX 1–4 switch and then
engage SOLO on one (and only one) of those
AUX SEND MASTERS. The OSCILLATOR level
appears on the CENTER (PFL) Meter.
Be aware: This does not mean that all out-
puts delivering the sine wave are calibrated,
as their levels may be dependent on their
own master level controls. But it does mean
that the sine wave level is calibrated as it's
fed to its ASSIGN switches.
.
connect a patch cable between the TALKBACK
OUT
input of one of the MAIN AUX RETURNS
A1 for example. Press EXTERNAL in the
TALKBACK ASSIGN section, and assign AUX
RETURN A1 to the center channel. Alternatively,
AUX RETURN B4
specifically assigned to the center channel.
The PINK NOISE/400HZ
oscillator cannot be assigned
directly to the CENTER
MAIN output
way to accomplish this is to
jack on the rear panel and the left
can be used, since it is
O O
RECEIVE
IGNORE
CALL
switch. COMMUNICATIONS
switch.
O O
LEVEL
OSCILLATOR
TALKBACK MIC
O O
TALKBACK LEVEL
MATRIX A
MATRIX B
MATRIX C
MATRIX D
ASSIGN
TALKBACK
. One easy
O O
SOLO LEVEL
,
O O
PHONES
INTERCOM
TALKBACK
CO
39
MAX
MAX
ON
400Hz
PINK NOISE
MAX
AUX 1-4
AUX 5-8
EXTERNAL
L/R
MAX
MAX
C O S