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Operating Manual - PROTEA SYSTEM II Digital Audio Products
8
while any dependent channels will show a flashing LED to indicate linked status. Although the audio paths remain
separate, the linked channels now act as one. Any action taken on the Current Channel will also affect the Linked
Channel(s). To unlink a channel, simply repeat the linking process to toggle the linked channel off.
Note: When two channel keys are simultaneously pressed, a pop-up screen will say "Changing Link Status". In
order to prevent accidental linking, the channel keys must be held down for a couple seconds until this screen goes away
for the change to take effect.
5.3 MENU KEYS
The MENU keys allow quick access to the powerful audio and setup features of Protea products. There are four Menu
softkeys and a MORE key which toggles to a second Menu screen. The first screen shows the core audio functions, EQ,
Comp/Limiter, HPF/LPF, and Delay, while the second screen displays Metering, User Preferences, MIDI Implementation, and
Security features. When the Menu keys select a function, softkeys below the LCD adjust specific parameters within each menu.
An important point to mention regarding the two different Menu Screens is that the first screen consists of audio
controls which can be saved to individual Presets, and will vary as the Current Channel or recalled Preset changes. The second
screen involves system setup details which are global in nature, in other words they will remain constant regardless of the
Current Channel or Preset selection. The following sections explain each Menu and their adjustable parameters.
5.3.1 EQ
The Protea graphic equalizer consists of 28 bands of Constant Q, reciprocal filters on third octave frequencies
with up/down keys for each band. Multiple
bands can be adjusted at the same time, and in-
dividual frequencies can be set flat quickly by
pressing both up and down keys together. Max
filter boost and cut is 15dB, and filter Q is 3.2.
To begin a new EQ curve with all faders at 0dB,
press the FLAT key.
The IN/OUT key to the right of the LCD
display enables or disables the EQ.
5.3.2 Cmp/Lim (Pre/Post)
A full featured, Pre/Post switchable compressor/limiter allows control of THRESHOLD, RATIO, ATTACK TIME,
and RELEASE TIME. Limiters are used prima-
rily for eliminating large transient signals which
may damage speaker components, and are simi-
larly used for keeping overall audio output levels
in a sound system within a specified range. All
compressor/limiter parameters are adjusted with
the appropriate softkey, found directly below its
respective slide-fader control on the display. The
current value for each parameter is displayed
above its control.
Threshold (THR) is the signal level in
dBu or VU (see METERING) above which the
limiter begins to prevent further increases in audio levels. The available Threshold range is -20 to +20 when Meters are
set for dBu, and -24 to +16 when set for VU . Whenever signal level exceeds the Threshold, the limiter screen indicates
the resulting amount of Gain Reduction, or the amount of attenuation in dB which has occurred to signal above the
threshold level. Output Metering utilizes dBu or VU as selected in UserPrefs (see sec. 5.3.6 USER PREFERENCES).
1.2K800 1K 1.6K
2K
2.5K
More
Menu
630
Preset 01
EQ OUT
Cmp/Lim
IN
HPF/LPF
OUT
DELAY OUT
-18
-15
-12
-10
-8
-6
-2
Thr
THR
0
RAT
4:1
ATT
5ms
REL
100ms
Pre
Post
EQ
GAIN
-4
-21
-9
-6
-3
0
+3
+6
+12
Pk
OUT
+9
-12
More
Menu
Preset 01
EQ IN
Cmp/Lim
OUT
HPF/LPF
OUT
DELAY OUT