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D
LCD PL
ATE AMPLIFIER
19
18
LCD PLATE AMPLIFIER
The
B 15A
subwoofer is equipped with a built-in 48 kHz/24 bit DSP processor that provides controlled
signal processing and limiting. This DSP core receives audio signals through dual-range inputs which
improve the SNR, and is easy to manipulate thanks to the rotary control encoder with push button,
and the 4x20 symbol alpha-numeric LCD screen.
This section details the features of the DSP firmware, whose adjustable parameters and features include
5 EQ bands, delay, polarity, selection low-pass filters and directivity control. In addition, a variety of factory
presets is available to easily setup subwoofer arrays and full-range systems with different products, both
from SE AUDIOTECHNIK's
®
or other brands.
Some key cursors, symbols and considerations used throughout the menu structure are:
-
The first line of each screen is the specific name or title of the given screen.
-
The cursor "
>
" marks the current point of action.
-
When editing preset names, the cursor "
←
" indicates deleting function.
-
The symbol "
*
" highlights the selection of a given preset or setting. It indicates also that the edition of
a given parameter is enabled.
-
The symbol "
L
" indicates the lock state of the amplifier and thus, that the editing of any parameter is
not allowed. This symbol appears only when this is activated, and only in the
Overview
screen.
Figure 8 details the different menus and functions of the DSP firmware, detailed in the following
subsections. Conversely, figures 13 and 27 show respectively the functions included in the
DSP
Settings
and
System Settings
.
OVERVIEW SCREEN
The Overview screen is the one shown by default on the amplifier LCD, during normal operation (Figure 9).
It details the next information:
OVERVIEW
IN:
OUT:
GR:
-10
-02
12
> > > > > > > >
> > > > > > > > > > >
6
5
4
3
2
1dB
Figure 9.
Overview screen.
-
The first row shows the title of the screen and if applicable, the “"
L
" letter in the top right-corner,
informing the lock state of the amplifier.
-
The second row shows the letters "
IN:
", followed by a numerical input level meter. The meter shows
the current input level value in dBFS, with minimum "
-90
" for low or no signal. The "
>>>
" symbols
show the signal strength relative to the clipping point at 0 dBFS. The readout is replaced with text
"
INPUT CLIPPING!
" if the signal reaches or exceeds 0 dBFS. In such case, the screen backlight is
flashing to call the attention of the user.
-
The third row shows the letters "
OUT:
" which are followed by the output level meter. This meter
shows current output level relative to the maximum amplifier output. If the channel is muted, the level
display meters are replaced with the text "
MUTED
".
-
The fourth row shows the gain reduction in dB "
GR:
" applied to the signal when the limiter threshold
is reached. When the value increases, new levels appear from right to left, according with the amount
of reduction applied.
Figure 10.
Turning the encoder in Overview screen allows to change output gain.
Out Gain: -6.0 dB
Change: -3.0 dB
OUT: -08 > > > > > > > > > > >
GR: 6 5 4 3 2 1dB
OVERVIEW
MENU
DSP SETTINGS
SYSTEM SETTINGS
Push
Push 3s
Turn & Push
Mute/Unmute
Current Configuration
Output Level
Turn
Figure 8.
DSP firmware functions and menus.
