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20 d&b Q-Series

The D6 and D12 amplifiers

The D6 and D12 are dual channel amplifiers developed and
manufactured by d&b utilizing Digital Signal Processing (DSP) to
incorporate loudspeaker specific configuration information and
functions. These are designed for use with d&b loudspeakers,
have both digital and analog signal inputs as well as link outputs,
remote control and monitoring capabilities and switch mode power
supplies. The level control incorporates a digital rotary encoder
enabling selection of all operating modes in conjunction with a
Liquid Crystal Display (LCD).
Loudspeaker specific configurations for current d&b loudspeakers
and a linear mode are contained within them, the exception
being that the D6 does not include 2-Way Active, V-Series and
B2-SUB configurations.
The digital elements of the D6 and D12 are specified and
constructed to achieve the best possible audio performance while
maintaining a very low latency of 0.3 msec. The Digital Signal
Processing is used to provide the loudspeaker specific configurations,
sophisticated protection circuits modelling thermal and mechanical
driver behaviour, and switch functions.
User definable equalization and delay functions are incorporated
in each channel of the amplifiers and can be used for applications
such as front fills or under balcony delays without the need for
external processors. The signal delay capability allows delay
settings of up to 340 msec. (= 100 m/328 ft) to be applied
independently to each channel as can the 4-band parametric
equalizer, providing optional Boost/Cut or Notch filtering. A
signal generator offering pink noise or sine wave program is also
incorporated for test and alignment purposes. Every unit can be
given a unique Device Name to simplify identification and a
password protected LOCK function is also incorporated to prevent
unauthorized changes.
The D6 and D12 amplifiers also detect incoming Pilot signals at
its input (Input monitoring) and can use Load monitoring and
System check functions to determine the status of the loudspeaker
impedance. d&b System check is designed to verify that the
system performs within a predefined condition and can be used
to report the system condition after a show.

d&b Load monitoring, on the other hand, enables automatic and
continuous impedance monitoring and along with Input monitoring
is designed for incorporation within applications specified to the
requirements stated in the International Standard IEC 60849
‘Sound Systems for Emergency Purposes’. Both can determine the
status of an LF or HF driver in systems with multiple elements,
even if these are crossed over passively.
The D6 utilizes a switch mode power supply with PFC suitable for
mains supply voltages 100 V/115 V/200 V/230 V, 50 - 60 Hz
whilst the D12 utilizes an autosensing switch mode power supply
for mains voltages 115/230 V, 50 - 60 Hz (optional 100/200 V).
Both power supplies have overvoltage protection and each
amplifier has a temperature and signal controlled fan to cool the
internal assemblies.
The 2 RU lightweight D6 is specifically designed to deliver medium
power into low impedance loads between 4 and 16 ohms. The
3 RU D12 is specifically designed to produce high power into
low impedance loads, typically those between 4 and 16 ohms.
Due to differences in impedance response against frequency, the
maximum number of cabinets driven by each D12 channel varies
depending on the loudspeaker type.
Apart from selectable output configurations for dual channel, Mix
TOP/SUB and 2-Way Active mode, the D12 also provides d&b
SenseDrive for use with the LF drivers in d&b active loudspeakers
and subwoofers.
Both amplifiers house an I/O panel containing: analog signal
inputs with link outputs for each channel, an AES/EBU digital
input with a link output and NL4 loudspeaker outputs. The D12
I/O panel additionally offers the options of EP5 or NL8
loudspeaker outputs. The two RJ 45 REMOTE sockets at the rear
of the D6 and the D12 amplifiers integrate them into the d&b
Remote network via CAN-Bus, enabling remote control and/or
monitoring.
A USB-B (D6) or a SUB-D9 (D12) SERVICE interface is provided
to enable future firmware updates containing new loudspeaker
configurations or additional functions to be loaded to the units.