Pre Fdr/Post Eq (Aux Sends 5-8); Main Aux Returns (A1-A4); Trim; Hpf - Mackie SR40.8 Owner's Manual

PRE FDR/POST EQ (AUX SENDS 5–8)
(switch up), EQ IN
Point Before: Fader
(switch down).
Point After: AUX sends 5–8
This switch has one difference from the PRE
switch for AUX sends 1–4: In the PRE mode
(named POST EQ), the tap point is still before
the Channel Fader, but after the EQ, instead of
before. If you prefer that your stage monitor
mixes have EQ, use these AUX sends with this
switch down. If you prefer no EQ, use AUX
sends 1–4 with the PRE switch down.
Main Aux
+15
Returns
+10
(A1–A4)
+5
Top to bottom:
High Shelving,
0
High-Mid
–5
Peaking, Low-
Mid Peaking,
–10
Low Shelving,
–15
High Pass
20 100
Hz Hz
Filter.
+15
+10
+5
0
–5
–10
–15
20 100
Hz Hz
+15
+10
+5
0
–5
–10
–15
20 100
Hz Hz
+15
+10
+5
0
–5
–10
–15
20 100
Hz Hz
+15
+10
+5
0
–5
–10
–15
20 100
Hz Hz
MAIN AUX RETURNS (A1–A4)
You've no doubt noticed that the MAIN AUX
RETURNS (A1–A4) look suspiciously like the
Channels. That's because they are Channels,
.
but they're stereo instead of mono, with full
routing to the LEFT/RIGHT/CENTER and Sub-
group mixes, AUX sends and SOLO. we'll just
cover the things that are different.

TRIM

The only difference between the Channel
TRIM
the fact that this one is stereo). With the control
fully down there will be 10dB of attenuation.
With the control fully up, 10dB of boost.
Perform the Level-Setting Procedure
every time you patch in a new sound source to
these stereo Channels, to assure maximum
headroom and minimum noise.

HPF

1k 10k 20k
Hz Hz Hz
This operates the same way as it does on
the Channels — engage the switch to activate
the HPF (high pass filter). The difference is
that the frequency is not adjustable — it's pre-
set at 150Hz, with a 18dB per octave curve.
We recommend that you leave the HPF
engaged at all times unless the signal has im-
portant ultra-low-frequency content that would
be diminished by using a 150Hz HPF. However,
1k 10k 20k
Hz Hz Hz
these stereo Channels are designed to handle
AUX return signals, and those signals rarely
have this ultra-low-frequency content.
EQ
The MAIN AUX RETURNS (A1–A4) have
4-band EQ, but the two midrange bands do not
have frequency sweep controls. The
frequencies are fixed at 12kHz (HI shelving),
1k 10k 20k
Hz Hz Hz
3kHz (HI-MID bandpass), 800Hz (LOW-MID
bandpass), and 80Hz (LOW shelving).
Using HPF
the LOW EQ without boosting the subsonic
debris, cleaning up your mix and conserving
amplifier power. We highly recommend its use.
1k 10k 20k
Hz Hz Hz
1k 10k 20k
Hz Hz Hz
and this one is the gain range (and
with EQ allows you to boost
U
TRIM
4
A
-10 +10
AUX
U
1
+15
O O
U
2
+15
O O
U
3
+15
O O
U
4
O O +15
A4
PRE
U
5
+15
O O
U
6
+15
O O
U
7
+15
O O
U
8
+15
O O
PRE FDR
POST EQ
U
EQ
HI
12k
-15 +15
U
HI
MID
3k
-15 +15
U
LOW
MID
800Hz
-15 +15
U
LOW
80Hz
-15 +15
EQ IN
LOW CUT
150 Hz
18dB/OCT
27