CXA21K power amplifiers has been designed to provide configurable, consistent and reliable high performance audio power amplification for residential, commercial and entertainment applications.

The CXA21K amplifier is full rack width, 2U format power amplifier that can drive both conventional low impedance (Lo-Z, 4Ω to 16Ω) loudspeakers and high impedance (Hi-Z, 70V/100V) transformer coupled loudspeakers. They provide four analogue inputs, one stereo S/PDIF digital input, and either two or four outputs (Lo-Z mode), or one or two outputs (Hi-Z or Lo-Z BTL mode). CXA21K amplifier model output channel counts and power outputs are as follows:

Mode Channels Max Rated Output per Channel

Lo-Z Four 500 Watts

Lo-Z Two 1000 Watts

Hi-Z Two 1000 Watts

Product Features

• Total System Power: 2000 W
• Channels: 4 x Lo-Z/2 x Hi-Z
• Output Power @ 2Ω: 4 x 500 W (SE)
• Output Power @ 4Ω: 4 x 500 W (SE) 2 x 1000 W (BTL)
• Output Power @ 8Ω: 4 x 250 W (SE) 2 x 1000 W (BTL)
• Output Power @ 100V: 2 x 1000 W (BTL)
• Full rack width, 2U

Product Specifications

• Channels: 4 x Lo-Z/2 x Hi-Z
• Output Power @ 2Ω: 4 x 500 W (SE)
• Output Power @ 4Ω: 4 x 500 W (SE) 2 x 1000 W (BTL)
• Output Power @ 8Ω: 4 x 250 W (SE) 2 x 1000 W (BTL)
• Output Power @ 100V: 2 x 1000 W (BTL)
• Total System Power: 2000 W
• Power Consumption: 700 W
• Output Voltage:
  • 65 Vp / 130 Vpp
  • (SE unloaded)
  • 130 Vp / 260 Vpp (BTL unloaded)
• Weight: 7.4 kg
• Dimensions: 88 x 440 x 332 mm (3.5 x 17.3 x 13.1 in)
• Output Circuitry: UMAC™ Class D - full bandwidth PWM modulator with ultra-low distortion
• Signal To Noise-Ratio: >108 dB (A-weighted, 20 Hz-20 kHz, 8 Ω load)
• THD+N (typical): < 0.05 % (20 Hz-20 kHz, 8 Ω load, 3 dB below rated power)
• Frequency Response: 20 Hz-20 kHz (+0/-0.5 dB (8 Ω load, 3 dB below rated power)
• Protection Circuits: Short circuit -, DC -, Undervoltage -, Temperature - and Overload protection
• Power Supply: UREC™ universal mains switch mode power supply with Power Factor Correction (PFC) and standby converter
• Operating temperature: 0-40° C
• Operating Voltage/Frequency: Universal Mains, 100 V-240 V, 50 Hz-60 Hz
• Standby Consumption: <0.5 W
• Power Ratings: 1 % THD @ 120 Vac and 230 Vac

What's in the Box?

• Amplifier unit
• Rack mount ears (fitted)
• Mains power cable
• Input connector x 2
• GPIO socket connector
• Output connector x 1 or 2
• Adhesive rubber feet x 4
• Document pack