IK Multimedia iLoud MTM Immersive Bundle High Resolution Compact Studio Monitors (11 Speakers, Black) - Manual (Page 13)

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Rear controls
The pushbuttons on the back panel will help you to perfectly match iLoud MTM to every acoustic environment.
LF extension
The LF extension button is a high-pass filter that can be set to filter out frequencies below 80 (LFE), 60Hz, 50Hz
(default) or 40Hz.
80 Hz low cutoff for bass management and subwoofer integration
Proper bass management can help by letting the main and surround speakers focus on the frequency range
they do best and letting the subwoofers handle the low-frequency range.
Adding a standard Butterworth fourth-order filter at 80 Hz (LFE) to MTM allows for quick integration with
subwoofers at the frequency and slope that are considered the standard when doing bass management in
multichannel or immersive setups.
To access this feature press the LF Extension button until all three LEDS are ON:
HF filter
This pushbutton controls the high frequency level using a shelf-type EQ. The level can be set to 0dB (FLAT),
+2dB or -2dB, from 8kHz up.