Coolback II 300 is a sophisticated, luxurious and powerful 3-way active “plate amplifier” intended to be
build into the back of the loudspeaker. The electronics consists of a digital crossover DCN23,
3 x class AB power amplifier modules PA1CC & PA3CC,
a dedicated power supply for the digital crossover and power amplifiers. The power supply PSU4SA
features individual regulated rails; one for the digital circuitry 3,3V; a 5V analogue supply for the converters and the positive
and negative supply for the op-amps. The power supply also features an Automatic sense turn ON / OFF circuit and of course a soft
start to prevent house fuse dropout. The toroidal transformer is a 350VA low noise type. All electronics are assembled on a 160mm x 40mm
German made aluminium heat sink profile with a height of 580mm. The high quality aluminium heat sink is CNC machined in Denmark.
The maximum flange can be 20mm.
The combination of low thermal resistance heat sink and low idle power consumption amplifier modules makes the Coolback II 300 run
The only visible on the outside are the connectors (Balanced Input - Neutrik XLR, PC Communication - Neutrik USB and IEC mains
Power inlet), Operation Switch (ON-OFF-AUTO) and LED Indicators (ON-StandBy). The Coolback II 300 is ideal for an ambitious
"small" to medium 3-way active DIY loudspeakers.
The Coolback II 300 can be programmed by either the free XOverWizard or the new
XOverWizard II standard or
XOverWizard II advanced software. The software makes the Coolback II 300 a precision tool for the ambitious DIY person and
optimal loudspeaker setups can be achieved.