powersoft M28Q User Manual

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13
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 congurations are possible
for any channel pair.
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1 input – 2 outputs
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2 inputs – 2 outputs
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2 mixed inputs – 2 outputs
Input section, allows system operation to improve sound for a
specic zone, group of speakers, room, etc. The input section
provides an input eq for any input channel with the following
features:
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5 biquad lters, any lter can become PEQ, shelving hi-lo
pass, all pass
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Delay: up to 170 ms for 2 in/2 out and up to 340 ms for 1
in/2 out congurations
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Gain between -40 dB and 6 dB
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Mute
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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:
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12 biquad lters, any lter can become PEQ, shelving hi-lo
pass, all pass. The crossover functions are obtained using one
to four biquad lters for each crossover.
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Delay of 10 ms
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Gain between -40 dB and 6 dB
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Mute
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Reverse polarity
Peak limiter feature:
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Threshold, 20 – 135 V. With 1 V steps
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Hold time, 0 – 2 sec. With 1 ms steps
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Release time, 0 – 2 sec. With 1 ms steps
RMS limiter feature:
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Threshold, 13 – 312 W @ 8 Ω. With step of 1 W
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Attack time, 2 – 4500 ms. With step of 1 ms
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Hold time, 0 – 1 sec. With step of 1 ms
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Release time, 4 – 4500 ms. With step of 1 ms
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Two biquad lters for frequency shaping. Frequency shaping
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:
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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):
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1 In/2 out basic layout (see FIGURE 16)
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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
congurations and for 2 input/2 output congurations 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 conguration
(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 congurations are available:
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1 input - 2 ouputs, the input is routed from channel 1.
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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 lters which can be chosen and
assigned from the set of standard IIR lters.
Output section
Every module provides each channel a set of 12 biqaudratic lters
and a complete set of limiters for protection purposes.
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Output eq: 12 biquad lters can be chosen for shaping (PEQ,
shelving, etc) but these are shared between the crossovers.
Each crossover can consume 1 to 4 biquad lters, depending
on the crossover slope. The charts below illustrates a number
of crossover congurations. Mixed crossover congurations
are possible (e.g. HP 12 dB/oct, LP 24 dB/oct)

powersoft M28Q Specifications

General

Brand	powersoft
Model	M28Q
Category	Amplifier
Language	English