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Connections
Make sure the power switch is off before attempting to
make any input or output connections.
By using good quality input and speaker cables, the like-
lihood of erratic signal behavior is reduced to a minimum.
Whether you make them or buy them, look for good quality
wires, connectors and soldering techniques.
4 : 1.Signal grounding
There is no ground switch or terminal on the M Series
amplifiers. all shield terminals of input connections are di-
rectly connected to the chassis. This means that the unit's
signal grounding system is automatic. in order to limit hum
and/or interference entering the signal path, use balanced
input connections.
in the interests of safety, the unit MuST always operate
with electrical safety earth connected to the chassis via the
dedicated wire in the 3-wire cable (refer to
supply). Never disconnect the ground pin on the ac mains
power cord.
4 : 2.Signal input
analog input is provided by means of two Neutrik XLr
connectors; refer to
panel c, p. 8
polarity for XLr and TrS plugs is shown in
4 : 3.Line output
Line out is provided in two channels models – M14D,
M20D, M30D – via a couple of XLr connectors on the rear
panel (refer
panel c, p.
8). in DSp equipped models, the
output signal is pre-DSp, being a replica of the input signal.
4 : 4.Loudspeaker connections
Output terminals are hazardous: wiring
connection to these terminals require
installation by an instructed person and the
use of ready-made leads.
Use suitable wire gauges to minimize power and
damping factor losses in speaker cables.
The output connectors are Neutrik NL4MD speakoN
located on the rear panel: refer to
F, p.
10. Each connector brings an output channel pair
making easy single ended and bridged loads.
The speakoN pinout and the suggested connections are
shown in
panel i, p.
12. in the single channel mode wiring,
the 1+ pin corresponds to positive, the 1– to negative signal
polarity.
18 | M Series
§3 : 4.ac mains
and
panel F, p.
10. Signal
panel H, p.
12.
panel c, p. 8
and
panel
Bridge mode connection is possible only in lo-Z operat-
ing mode: minimum load impedance shall be 8Ω. Bridging
of adjacent channels is possible for the following pairs:
channels 1 with 2 for all models and channels 3 with 4 for
Mxxq models.
in order to set the output in bridge mode:
f parallel the input by pressing on the link button;
f
f connect the loudspeaker to just one speakoN: 2+ pin
f
is the positive and the 2– the negative.
Some models of the M Series amplifiers are designed to
work with hi-Z loads in 70V / 100V distributed lines; refer to
TaB. 1
for compatibility.
Model
M14D
M14D HDSp+ETH
M20D
yes w/external HpF
yes w/internal
M20D HDSp+ETH
preset
yes w/external HpF
M30D
and peak limiter
yes w/internal
M30D HDSp+ETH
preset
M28q
M28q HDSp+ETH
yes w/external HpF
M50q
and peak limiter
yes w/internal
M50q HDSp+ETH
preset
TaB. 1: Hi-Z distributed lines compatibility chart.
4 : 5.Ethernet connection
M Series HDSp+ETH models can be remotely controlled
via an Ethernet connection through a personal computer
and powersoft armonía pro audio Suite™ software.
powersoft recommend the use of Ethernet cat5 straight
through – patch – cables with pin/pair assignments Tia/
Eia-568-B, i.e. T568B.
4 : 6.Auxiliary voltage
on M Series HDSp+ETH models the auxiliary voltage
connector is used to enable remote management of the
DSp when the system is off.
When powered with an external 12 V
ternal controller allows to configure the DSp via the armonía
pro audio Suite software, even without ac mains supply.
4
70V
100V
no
no
no
no
no
no
yes w/external HpF
yes w/internal
preset
no
no
no
no
yes w/external HpF
yes w/internal
preset
(1 a max) the in-
Dc
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