9
8. LEVEL
This is used to adjust the signal level going into the
built-in power amplifiers, from off, up to 40 dB of gain.
Since the SRM450v incorporates Mackie’s world-class
low-noise mic preamp technology, you can connect either a
line-level or a microphone-level signal to the input, and use
this control to adjust the level correctly.
There is no phantom power for a mi-
crophone, so you should use a dynamic
mic, or use a condenser type if it has its
own battery power.
Follow the Quick Start guide on page 6 for setting the
LEVEL control. For most applications, it will be in the NOR-
MAL position (1 o’clock). If you have a particularly high
line-level signal connected to the SRM450v, you may need
to turn the control down to the LINE indication (9 o’clock).
If you have a low line-level or mic-level signal connected,
you may need to turn the LEVEL control up to the MIC in-
dication ( o’clock).
9. SIGNAL PRESENT Indicator
This LED illuminates whenever there is a signal present
at the INPUT connector on the rear panel. It senses the
signal just prior to the LEVEL control, so even if the LEVEL
control is turned down, the SIGNAL PRESENT indicator
still works, letting you know there is a signal present at the
input before turning up the LEVEL control.
10. PEAK Indicator
When the signal levels at the amplifier outputs approach
clipping, a soft compression circuit is activated that re-
duces the input signal. The PEAK LED lights whenever the
compression circuit is active. At this time, the SRM450v
may reach sound pressure levels of 10 dB or more.
It’s okay for the PEAK indicator to blink occasionally,
but if it blinks frequently or continuously, either turn down
the signal level at the mixer or other signal source, or turn
down the SRM450v’s LEVEL control.
Wear hearing protection if you are
close to the SRM450v playing at high
levels.
11. INPUT Connector
This is a female XLR-type connector that accepts a bal-
anced or unbalanced mic- or line-level signal.
12. THRU Connector
This is a male XLR-type connector that produces exactly
the same signal that is connected to the INPUT jack. It can
be a balanced or unbalanced mic- or line-level signal. Use it
to daisy-chain several active speakers together off the same
signal source.
