Internal Processing Layout - powersoft M50Q HDSP+ETH User Manual

M Series User Guide
1 and 2 while on a MxxQ there are two modules available: one
for channels 1 and 2 and another for channels 3 and 4. Keep in
mind that the modules are physically separated, therefore input or
output from different modules can't be mixed together.
Input routing selection and internal signal route. Keep in mind
that due to the internal structure it is impossible to mix signals
between non adjacent channels, for example channel 1 and 4
cannot be mixed together but only channels 1-2 and channels 3-4
(on MxxQ models) can. The following configurations are possible
for any channel pair.
1 input – 2 outputs
▶
2 inputs – 2 outputs
▶
2 mixed inputs – 2 outputs
▶
Input section, allows system operation to improve sound for a
specific zone, group of speakers, room, etc. The input section
provides an input eq for any input channel with the following
features:
5 biquad filters, any filter can become PEQ, shelving hi-lo
▶
pass, all pass
Delay: up to 170 ms for 2 in/2 out and up to 340 ms for 1
▶
in/2 out configurations
Gain between -40 dB and 6 dB
▶
Mute
▶
Reverse polarity
▶
Output section, allows multiway cabinet equalization and
protection. The output section comprises an output eq and a
limiter (peak and RMS) for each channel.
Eq feature:
12 biquad filters, any filter can become PEQ, shelving hi-lo
▶
pass, all pass. The crossover functions are obtained using one
to four biquad filters for each crossover.
Delay of 10 ms
▶
Gain between -40 dB and 6 dB
▶
Mute
▶
Reverse polarity
▶
Peak limiter feature:
Threshold, 20 – 135 V. With 1 V steps
▶
Hold time, 0 – 2 sec. With 1 ms steps
▶
Release time, 0 – 2 sec. With 1 ms steps
▶
RMS limiter feature:
Threshold, 13 – 312 W @ 8 Ω. With step of 1 W
▶
Attack time, 2 – 4500 ms. With step of 1 ms
▶
Hold time, 0 – 1 sec. With step of 1 ms
▶
Release time, 4 – 4500 ms. With step of 1 ms
▶
Two biquad filters for frequency shaping. Frequency shaping
▶
13
▶
is a function obtained by pre and post limiter eq. The same
eq (with opposite gain) is applied before and after the limiter.
Damping control:
Impedance correction between -2 Ω to +2 Ω with 0.1 Ω
▶
steps

5.12.3 Internal Processing Layout

The following two layouts are available for each module (and its
associated channel pair):
1 In/2 out basic layout (see FIGURE 16)
▶
2 In/2 out basic layout with mono mix capabilities (see
▶
FIGURE 17)
Due to the internal structure of the DSP, in order to optimize
performance, two different binary presets for 1 input/2 output
configurations and for 2 input/2 output configurations must be
used. Be aware that any change in the binary preset causes an
audio interruption while the M Series microprocessor loads the
preset data into the DSP. This means that a change in configuration
(e.g. going from 1 input to 2 inputs ) or reloading a preset from
the internal memory results in an audio interruption.
NOTE: The following information is valid for any single DSP
module (2 channels). Devices with 4 channels are formed by 2
completely independent modules.
Input routing
The two following configurations are available:
1 input - 2 ouputs, the input is routed from channel 1.
▶
2 inputs - 2 outputs, the input is routed from channel 1 and
▶
channel 2. It is possible to mix the two signals together; the
mono mix function sums the two sources and halves their
summed level.
Input section
The input section is formed by the input eq alone, one for each
channel of the loaded layout. For example, in the 1 input / 2 output
module layout there is only 1 input eq for both output channels.
Every input eq has 5 biquadratic filters which can be chosen and
assigned from the set of standard IIR filters.
Output section
Every module provides each channel a set of 12 biqaudratic filters
and a complete set of limiters for protection purposes.
Output eq: 12 biquad filters can be chosen for shaping (PEQ,
▶
shelving, etc) but these are shared between the crossovers.
Each crossover can consume 1 to 4 biquad filters, depending
on the crossover slope. The charts below illustrates a number
of crossover configurations. Mixed crossover configurations
are possible (e.g. HP 12 dB/oct, LP 24 dB/oct)