d&b audiotechnik M6, Руководство пользователя

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Active operation ("2–Way Active" mode)
Selecting "2–Way Active" mode with the M6 setup enables up to
two M6 cabinets to be driven actively by the respective amplifier.
In "2–Way Active" mode separate LF and HF signals are routed to
the amplifier channels. Pins 1+/1– of both NL4 output connectors
(EP5: pins 1/2) carry the LF signal, pins 2+/2– (EP5: 3/4) carry
the HF signal.
For D80 and D12 amplifiers, the output connector pin assignment
is set automatically when "2–Way Active" mode is selected. For all
other applicable amplifiers, a dedicated socket for active
operation is available.
The input signal can be fed either to INPUT A or to INPUT B and is
routed (linked) to both amplifier channels internally.
2.3.1. Controller settings
For acoustic adjustment the functions CUT, HFA and CPL can be
selected.
CUT mode
Set to CUT, the low frequency level is reduced. The cabinet is now
configured for use with actively driven d&b subwoofers.
HFA mode
In HFA mode (High Frequency Attenuation), the HF response of the
system is rolled off. HFA provides a natural, balanced frequency
response when a cabinet is placed close to listeners in near field or
delay use.
High Frequency Attenuation begins gradually at 1 kHz, dropping
by approximately 3 dB at 10 kHz. This roll off mimics the decline
in frequency response experienced when listening to a system from
a distance in a typically reverberant room or auditorium.
CPL function
The CPL (Coupling) function compensates for coupling effects
between the cabinet and close boundary surfaces or when the
cabinet is used as a stage monitor. CPL begins gradually around
1 kHz, with the maximum attenuation below 400 Hz. To achieve a
balanced frequency response, the CPL function can be set to dB
attenuation values between 0 and –9.
Positive CPL values create an adjustable low frequency boost (0 to
+5 dB) and can be set when the system is used in full range mode
without subwoofers.
For a single cabinet in free space conditions a value of +3 dB is
recommended.
2.3.2. Operation with E-PAC
Selecting M6 mode enables the E-PAC to drive one M6
loudspeaker. LO IMP mode configures the E-PAC to drive a
maximum of two M6 loudspeakers with a 6 dB reduction in input
level to the loudspeakers.
For acoustic adjustment the CUT and HFA modes are available.
The characteristics are described in the previous section.
Input/Output routing "2–Way Active"*
* Schematic diagram
-5
0
5
10
-10
-15
-20
-25
-30
20 100 1k 10k 20k
Frequency response correction in HFA mode
Frequency response correction of the CPL function
d&b M6 Manual 1.1 en 7