4 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 likeli-
hood of erratic signal behaviour 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 Bias Series am-
plifiers. All shield terminals of input connections are directly
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
§3 : 4.AC mains
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 and Panel F, p. 4. Signal polarity for
XLR and TRS plugs is shown in Panel H, p. 5.
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 Panel C, p. 8 and Panel F, p.
4. 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. 5. In the single channel mode wiring,
the 1+ pin corresponds to positive, the 1– to negative signal
polarity.
4.5 Ethernet connection
Bias Series HDSP+ETH models can be remotely controlled
via an Ethernet connection through a personal computer
and Void Armonía Pro Audio Suite™ software.
Void 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 Bias 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
DC
(1 A max) the internal
controller allows to configure the DSP via the Armonía Pro
Audio Suite software, even without AC mains supply.
Bridge mode connection is possible only in lo-Z operating
mode: minimum load impedance shall be 8Ω. Bridging of
adjacent channels is possible for the following pairs: chan-
nels 1 with 2 for all models and channels 3 with 4 for MxxQ
models.
In order to set the output in bridge mode:
•
parallel the input by pressing on the link button;
•
connect the loudspeaker to just one speakON: 2+ pin is
the positive and the 2– the negative.
Some models of the Bias Series amplifiers are designed to
work with hi-Z loads in 70V / 100V distributed lines; refer to
TAB. 1 for compatibility.
Model
70V
100V
M14D
no
no
M14D HDSP+ETH
no
no
M20D
yes w/external HPF
no
M20D HDSP+ETH
yes w/internal
preset
no
M30D
yes w/external HPF
and peak limiter
yes w/external
HPF
M30D HDSP+ETH
yes w/internal
preset
yes w/internal
preset
M28Q
no
no
M28Q HDSP+ETH
no
no
M50Q
yes w/external HPF
and peak limiter
yes w/external
HPF
M50Q HDSP+ETH
yes w/internal
preset
yes w/internal
preset
TAB. 1:
Hi-Z distributed lines compatibility chart.
Bias VQ User Guide V1.0
Page 10
