Coolback 600

Version 2014
** Discontinued **

3-Way Active Amplifier Solution with Digital Crossover

Coolback 600 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 PA3CC, a dedicated power supply for the digital crossover and power amplifiers. The power supply PSU12SA 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 550VA 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 19mm.

The combination of low thermal resistance heat sink and low idle power consumption amplifier modules makes the Coolback 600 run very cool.

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 600 is ideal for an ambitious 3-way active DIY loudspeakers.

The Coolback 600 can be programmed by either the free XOverWizard or the new XOverWizard II standard or XOverWizard II advanced software. The software makes the Coolback 600 a precision tool for the ambitious DIY person and optimal loudspeaker setups can be achieved.




  • DCN23 * 24bit 96kHz Digital Crossover Module
  • PA3CC * 200W (8Ω) / 350W (4Ω) Power Amplifier Module (tweeter) - min. load 3Ω
  • PA3CC * 200W (8Ω) / 350W (4Ω) Power Amplifier Module (mid-range) - min. load 3Ω
  • PA3CC * 200W (8Ω) / 350W (4Ω) Power Amplifier Module (bass) - min. load 3Ω
  • PSU12SA * System Power Supply - 12 Nichicon Gold Tune Capacitors 56.400µF/100V
  • TR550 * Silent Design Toroidal Transformer 2 x 50Vac / 550VA (rectified +/-70V dc)
  • Distortion : <0.08%
  • Frequency response : 5-45kHz (-3dB)
  • Signal/Noise Ratio : >108dB
  • Thermal protection above 80°Celcius
  • Weight: app. 15kg
  • Cut-out dimensions: 512mm (height) x 212mm (width) - Internal Depth 95mm
  • Overall dimensions: 550mm (height) x 250mm (width) x 110mm (depth) © Ground Sound * Products of Denmark