User manual

Block diagram - full range active system
Highpass
switchable
2-way box
with Speaker ID
and SenseDrive
Configuration
Level
Mute
Displacement
Temperature
Input Stage
HF-Protect
EQ VCA
Power Amplifier
Cross Over
EQ VCA
Power Amplifier
HF Level
ID
Sense
Drive
Displacement
Temperature
1-2 A1 User Manual
1.2. d&b active systems design
Their are two types of d&b active loudspeaker system - active sub-
woofers and full range, 2 way, active loudspeakers. Each type of
active system is driven by an A1 mainframe fitted with a single,
loudspeaker specific controller module.
The different loudspeaker controller modules house the signal pro-
cessing electronics, connectors, controls & indicators appropriate to
the different types of loudspeaker.
As well as the controller module, the A1 mainframe houses two se-
parate power amplifiers - a 1200 W / 4 Ohm low frequency am-
plifier and a 350 W / 4 Ohm high frequency amplifier. In the case
of the full range 1220 System, a single A1 fitted with a 1220 con-
troller module can drive two 1220 cabinets. With the higher output
full-range F2 System, each F2 cabinet needs to be driven by its
own A1/F2 controller module combination.
The full range systems can of course be supplemented with B1 or
B2 subwoofers. Each active subwoofer cabinet is driven by its own
A1/controller module combination - the mainframe HF amplifier
being unused.
The modular nature of mainframe based systems allows later re-
configuration. Simply changing the type of controller module fitted
to a mainframe alters the mode of mainframe operation without
the need for any internal changes to the mainframe itself.
The A1 mainframe incorporates an interface for remote control
and monitoring of all controller module and mainframe functions.
Active full range systems may also be used with Series 02 subwoo-
fers - e.g. the F2 System and C4-SUBs. Series 02 systems use the
d&b 1200A mainframe.
1.3. Block diagram