Zone Eq - Bose FREESPACE 4400 Owner's Manual

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.
Music
signal
Ducking depth
0 to –40dB
Page
signal
Ducking Time:
Fixed at 20 ms for Auto Detection,
0 ms for PTT Detection.
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.
6.0 FreeSpace
Hold Time
0 to 5 secs
Release Time
0 to 5 secs
4400 System Setup
®

6.3.7 Zone EQ

The Zone EQ control panel provides a three-band equalizer for
adjusting the sound quality of the zone.
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
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.
• 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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Hi
0 dB
LF-EQ
∑
MF-EQ
HF-EQ