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 SRM450v2 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 microphone, 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 NORMAL position (12 o’clock). If you have a particularly high line-level signal connected to the SRM450v2, 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 indication (3 o’clock).

10. PEAK Indicator

When the signal levels at the amplifier outputs approach clipping, a soft compression circuit is activated that reduces the input signal. The PEAK LED lights whenever the compression circuit is active. At this time, the SRM450v2 may reach sound pressure levels of 120 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 SRM450v2’s LEVEL control.

Wear hearing protection if you are close to the SRM450v2 playing at high levels.

11. INPUT Connector

This is a female XLR-type connector that accepts a balanced or unbalanced mic- or line-level signal.

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.

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.

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