LINE INPUTS (Channels 1�6)it out makes the low stuff you do want much
more crisp and tasty. Not only that, but LOW
These six line inputs share circuitry (but
CUT can help reduce the possibility of feed-
not phantom power) with the mic preamps,
back in live situations and it helps to conserve
and can be driven by balanced or unbalanced
the amplifier power.
sources at almost any level. You can use these
Another way to consider LOW CUTOs func-
inputs for virtually any signal youOll come
tion is that it actually adds flexibility during
across, from instrument levels as low as �30dB
live performances. With the addition of LOW
to operating levels of �10dBV to
CUT, you can safely use LOW equalization on
+4dBu, since there is 30dB more gain available
vocals . Many times, bass shelving EQ can
than on Channels 7�14. To learn how signals
really benefit voices. Trouble is, adding LOW
are routed from these inputs: .
EQ also boosts stage rumble,
To connect balanced lines to these inputs,
+15
mic handling clunks and
use a 1�4" Tip-Ring-Sleeve (TRS) plug, the type+10
breath pops. LOW CUT re-
found on stereo headphones:+5
moves all those problems so0
RING SLEEVESLEEVE RING TIP
you can add low EQ without�5
TIPlosing a woofer.�10
�15
RINGHereOs what the combina-20Hz100Hz1kHz10kHz 20kHz
TIP
tion of LOW EQ and LOWLow Cut with Low EQ
SLEEVE
CUT looks like in terms of
Tip = Positive (+ or hot)
frequency curves.
Ring = Negative (� or cold)
Sleeve = Shield or ground TRIM (Channels 1�6)
To connect unbalanced lines to these in-
If you havenOt already, please read the Level
puts, use a �4" mono (TS) phone plug or1
Setting Procedure .
standard instrument cable:TRIM adjusts the input sensitivity of the mic
and line inputs connected to Channels 1
SLEEVESLEEVETIP
through 6. This allows signals from the outside
TIPworld to be adjusted to optimal internal oper-
TIP
ating levels.
SLEEVEIf the signal originates through the XLR
Tip = Signaljack, there will be 10dB of gain with the knob
Sleeve = Groundfully down, ramping to 60dB of gain fully up.
Through the 1�4" input, there is 10dB of at-
Line inputs 1�6 are a good place to connect
tenuation fully down and 40dB of gain fully up,
older instruments that need more gain. You
with a OU� (unity gain) mark at 9:00.
can correct weak levels by adjusting the corre-
This 10dB of attenuation can be very handy
sponding channelOs TRIM control .
when you are inserting a signal that is very hot,
LOW CUT (Channels 1�6)or when you want to add a lot of EQ gain, or
both. Without this Ovirtual pad,� a scenario like
The LOW CUT switch, often referred to as a
that might lead to channel clipping.
High Pass Filter (all depends on how you look
at it), cuts bass frequencies below 75Hz at a
+4 / �10 (Channels 7�14)
rate of 18dB per octave.
This switch adjusts the input sensitivity of+15We recommend
+10the line inputs on channels 7�14. If the sound
that you use LOW
+5source is a O�10� device, engage this switch. If
CUT on every micro-
0
you are unsure, leave the switch up and per-
phone application
�5
form the Level Setting Procedure ,
�10except kick drum,
�15substituting this switch for the TRIM knob andbass guitar, bassy
20Hz100Hz1kHz10kHz 20kHz
then setting the switch to the appropriate gain
synth patches, or re-
Low Cut
setting.
cordings of
earthquakes. These aside, there isnOt much
down there that you want to hear, and filtering
11 |
ACEC
