Mackie SRM450V2 User Manual

8

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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. 

If the SRM450v2 keeps shutting down, 
make sure there is plenty of ventilation 
to the rear panel. Please see “Thermal 
Considerations” on page 12. 

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.

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.

The SRM450v2 has several connectors, controls, and 

indicators that you should understand.

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.

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.

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.

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.