d&b M4 - Manual (Page 5)

Operation with D6 or D12
Select the controller setup M4.
Operation with D6
Up to a total of two M4 loudspeakers can be passively driven by each
D6 amplifier channel.
Operation with D12
The D12 allows the M4 cabinet to be driven either in "2-Way Active"
mode or in passive mode.
Active operation ("2-Way Active")
INPUT A/B OUT A
2-Way
OUT B
2-Way AMP B
AMP A
Low
High
D12 Input/Output routing "2-Way Active"
Selecting "2-Way Active" mode with the M4 setup enables up to two
M4 cabinets to be driven actively by the D12 amplifier. In applications
with low continuous levels and low ambient temperatures up to three
cabinets may be connected.
In "2-Way Active" mode the D12 routes separate LF and HF signals to
the amplifier channels. Pins 1/2 of both EP5 output connectors
(NL4: 1+/1–) carry the LF signal, pins 3/4 (NL4: 2+/2–) carry the HF
signal. The output connector pin assignment is set automatically when
"2-Way Active" mode is selected.
The input signal can be fed either to INPUT A or to INPUT B and is
routed (linked) to both amplifier channels internally.
Passive operation ("Dual channel" mode)
OUT A
OUT B AMP B
AMP A INPUT A/B
INPUT A/B
D12 Input/Output routing "Dual Channel"
Selecting "Dual channel mode" with the M4 setup enables up to two
M4 cabinets to be driven by the respective channel. In applications with
low continuous levels and low ambient temperatures up to three
cabinets per channel may be connected.
In "Dual channel" mode each amplifier channel drives all output pins of
its respective output connector thus driving the cabinet's HF and LF
sections via their passive crossover networks. Pins 1/3 of the EP5 output
connector (NL4: 1+/2+) carry the positive and pins 2/4 (NL4: 1–/2–)
carry the negative components of the signal.
Passive operation ("Mix TOP/SUB" mode)
With its standard connector wiring the M4 requires 4 wires to be driven
and therefore cannot be used in "Mix TOP/SUB mode". However, for
permanent passive use with dedicated cabling the M4 setup is also
available in "Mix TOP/SUB mode".
M4 Manual (1.7 EN) Page 5 of 10