27
All 12 lters offer an identical selection of lter types (see
below). The parameters are displayed across three screen
pages; press the h and i buttons to scroll between pages. For
each lter, ve EQ parameters are available for adjustment:
Enable – the Enter button enables the lter. Default is Off.
Type – 16 different algorithms are available for each lter. The
default is Bell-Sym. The full list is:
TYPE DISPLAYED AS: GAIN? Q?
Bell-Symmetrical Bell-Sym
Bell-Asymmetrical Bell-Asym
Notch Notch
Low-Shelving 6dB/oct Low-Shelv 6dB/o
Low-Shelving 12dB/oct Low-Shelv 12dB/o
High-Shelving 6dB/oct High-Shelv 6dB/o
High-Shelving 12dB/oct High-Shelv 12dB/o
All-Pass 90° All-Pass 90
All-Pass 180° All-Pass 180
Low-Pass 6dB/oct L-Pass 6dB/o
Low-Pass 12dB/oct L-Pass 12dB/o
Low-Pass Vari-Q 12dB/oct L-Pass VarQ 12dB/o
High-Pass 6dB/oct H-Pass 6dB/o
High-Pass 12dB/oct H-Pass 12dB/o
High-Pass Vari-Q 12dB/oct H-Pass VarQ 12dB/o
Band-Pass Band-Pass
The Gain? And Q? columns in the table show whether these
two parameters are xed or available for adjustment () for
each lter type. Note that Type is a common parameter which
applies to all 12 lters making up the equaliser.
Frequency – this shows the centre frequency of the selected
lter. It may be varied over the range 10 Hz to 22 kHz, in 0.1
Hz increments. Note that the default values are at standard fre-
quencies:
FILTER DEFAULT FREQUENCY
1 31.5 Hz
2 63.0 Hz
3 125 Hz
4 200 Hz
5 315 Hz
6 500 Hz
7 800 Hz
8 1.25 kHz
9 2 kHz
10 3.15 kHz
11 6.3 kHz
12 12.5 kHz
Gain – for lter types allowing adjustable gain, this parameter
allows between -40 and +15 dB of gain to be applied at the
selected frequency.
Q – for lter types allowing adjustable Q, the bandwidth of the
lter section may be set in the range from Q = 0.1 (wide) to 48
(a very narrow notch).
Gain
Two gain parameters are available for adjustment. Use the
rotary control to highlight the parameter required.
Level – this sets the post-EQ gain for the selected output
Channel (pre the DAC in the case of analogue outputs). The
default gain setting is 0 dB, but can be set to any value from -80
dB to +15 dB, in 0.1 dB increments.
Polarity – individual outputs may be phase-inverted as well as
inputs. Polarity inverts the currently-selected Output Channel.
The options are Normal or Inverted.
Limiter
For full details on how to correctly calculate limiter parameters
please visit the Apex website (www.apex-audio.eu) and
download the latest white-paper.
To fully protect loudspeakers and other downstream equipment
from damage, each output is provided with a two-stage limiter.
One stage responds to the RMS level of the signal, the other
is a very fast-acting limiter responding to signal peaks. The
thresholds may be set independently for each stage, but note
that the Peak threshold must always be higher than the RMS
threshold.
RMS Threshold – this is the RMS signal level above which
limiting is applied. It can be set as either dBu - the actual
output signal level, as would be appropriate when analogue
outputs are in use, or as dBFS, which is applicable to digital
outputs. The threshold may be set at any level below 0 dBFS
(the default) down to -80 dBFS. The corresponding analogue
To Next Page
Loading...