Rear Panel Description; Iec Socket; Power Switch; Power On Indicator - Mackie SRM450v2 Owner's Manual

REAR PANEL DESCRIPTION

The SRM450v2 has several connectors, controls, and
indicators that you should understand.

1. IEC Socket

This is where you connect the supplied AC linecord to
provide AC power to the SRM450v2's built-in power
amplifiers. Plug the linecord into an AC socket properly
configured for your particular model.
Note: If you happen to lose the AC linecord,
replacements are readily available at any office or computer
supply store. Always use a three-pin plug with a ground pin.

2. POWER Switch

Switch up to turn the SRM350v2 on. Make sure the
LEVEL control is down before you turn it on. Press the
bottom of this switch to put the speaker into standby mode.
It will not function, but the circuits are still live. To remove
AC power, either turn off the AC mains supply, or unplug
the power cord from the speaker and the AC mains supply.

3. POWER ON Indicator

When the POWER switch is turned on, and the linecord
is connected to an active AC Mains supply, this indicator,
located just above the POWER switch, glows to let you
know that you're ready to rock and roll. The cool blue LED
on the front of the speaker works in the same way.

4. TIMED TURNOFF

When this switch is pushed in, the built-in amplifiers turn
on and off depending on the presence or absence of an input
signal. An input signal level of –45 dBu (minimum) activates
the auto-on function. A silent period greater than three
minutes activates the auto-off function. The blue LED on the
front of the speaker reflects the state of the amplifiers.
THERMAL
ON
OFF
TIMED TURNOFF
8

5. THERMAL Indicator

This LED lights if the heatsink temperature exceeds a
safe operating temperature and triggers the thermal safety
switch. In the unlikely event that this occurs, the built-in
amplifiers shut down until the heatsink temperature cools
back down. Then the thermal switch resets itself, the
THERMAL indicator turns off, and normal operation
resumes.

6. CONTOUR

Pushing in this switch engages a filter that provides 3 dB
of boost to the low and high frequencies (below 100 Hz
and above 12 kHz). This provides a punchy, crisp sound
for most live music applications. You can experiment with
this switch by leaving it out for a while, then pushing it in
to determine which way sounds best for your application.
It is especially useful when listening at lower volumes, as
it highlights the bass like a Loudness switch, in addition to
boosting the highs.

7. LOW CUT

Pushing in this switch engages a low-cut filter, which
rolls off the low frequencies below 75 Hz. This is useful for
minimizing stage noise (rumble) and microphone handling
noise.
It is highly recommended that you engage this switch
when using the SRM450v2 as a stage monitor. This allows
the bass amplifier to utilize its power for those frequencies
useful in stage monitor applications.
POWER
100Hz
ON CONTOUR
O
If the SRM450v2 keeps shutting down,
make sure there is plenty of ventilation
to the rear panel. Please see "Thermal
Considerations" on page 12.
PEAK
12k/AIR 75Hz
LOW CUT
+3dB
THRU
PARALLEL
SIGNAL PRESENT
NORMAL
(+4dBu)
MIC
LINE
+40dB
O O
LEVEL
INPUT