Bose E4 manual Paging operation, Zone EQ operation

6.0 E4 System Setup

Paging operation

When a page signal is triggered, the music signal is ramped down according to the ducking time. The ducking time is preset at 20 ms for Auto detection and 0 ms for PTT triggering. The music level is reduced by the ducking depth which can be adjusted using the ducking depth control. Ducking depth is adjustable from 0 to –40 dB. Once a page is completed and the Hold Time has elapsed, the music volume is ramped up accord- ing to the ducking release time, which is adjustable from 0 to 5 seconds in 0.5-second increments.

6.3.7 Zone EQ

The Zone EQ control panel provides a three-band equalizer for adjusting the sound quality of the zone.

Music signal

Ducking depth

0 to –40dB

Page signal

Ducking Time:

Fixed at 20 ms for Auto Detection,

0 ms for PTT Detection.

Hold Time 0 to 5 secs

Release Time

0 to 5 secs

Click and drag each slider to the level you want. The scale on the left side of the panel is expressed in dB.

Factory default settings

Low	Mid	Hi
0 dB	0 dB	0 dB

ZONE EQ operation

The center frequency and shape of each EQ band is fixed and can be adjusted by ±6 dB.

LF-EQ

∑

MF-EQ

Programmer’s Note: The attack time for a page is approximately 1 millisecond for a PTT input and 20 milli- seconds for a voice-activated input.

HF-EQ

•The low-frequency EQ (LF-EQ) is a low-pass shelf EQ with a corner frequency of 125 Hz and a roll-off of 6 dB per octave.

•The mid-frequency EQ (MF-EQ) has a center frequency of 1.6 kHz and a Q of 1.

•The high-frequency EQ (HF-EQ) is a high-pass shelf EQ with a corner frequency of 8 kHz and a roll-off of 6 dB per octave below this point.

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