Gain Structure; Input Headroom (Analog Inputs Only) - Lake LM Series Quick Start Manual

6. Quick Start Tutorial
32. There are five gain faders displayed (1 Module Input, 4 Module Outputs). Set the values by dragging the fader,
or by tapping the blue highlighted values at the top of the screen:
• INPUT: -0.00 dB
• LOW-1: -3.00 dB
• MID-2: -6.00 dB
• HIGH-3: -12.00 dB
• AUX-4: 0.00 dB
33. Tap the EQ tab at the top-left of the screen, then tap the XOVER tab. This screen shows the frequency split
settings for the 3-way crossover and can be adjusted according to manufacturer specifications or by
measurement and manual tuning as required. Please refer to the LAKE Controller Operation Manual for detailed
information on the XOVER screen.
34. Tap the AUX-4 tab to show the HPF/LPF and EQ settings for the Subwoofer channel. Please refer to the LAKE
Controller Operation Manual for detailed information on the AUX screen.
35. Navigate to the LEVELS page by tapping the LEVELS tab at the top left of the screen.
36. Unmute the Module Input by tapping the red MUTED button; the button turns blue and reads UNMUTED.
37. Turn on the amplifiers / powered speakers and turn up the volume as required.
38. Start playback of audio through the mixing console and gradually increase the volume of the MAIN and
SUBWOOFER channels from the mixing console.
39. Use the powerful XOVER, AUX, PEQ and GEQ screens to tune your loudspeaker as required. Please refer to
the LAKE Controller Operation Manual for detailed information on these features.

6.5. Gain Structure

The LM Series architecture provides gain adjustments at various points in the signal path and therefore, various
places for muting and level adjustment. Each mute or gain adjustment point serves a different purpose.
Detailed information on signal flow and gain structure is available in the LM Series Operation Manual. The signal
flow diagrams show in chapter 5 are useful signal path references, and the following sections describe the various
adjustment points, all of which are available via the LAKE Controller software.

6.5.1. Input Headroom (Analog Inputs Only)

This parameter should be set relevant to the output level of the analog audio source (e.g. mixing console).
This setting does not affect the other gain stages, or the overall noise floor; it allows control of the appropriate
headroom at the input stage only.
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LM SERIES Quick Start Guide rev 1.3.6