NXAMP is far more complex than a bundled power amplifier and loudspeaker controller. Significant DSP innovations allows multiple digital sense lines to protect at the same time the amplifier and the connected speakers. First the NXAMP4x1 uses a unique dual mains cord, feeding the power supplies with nearly twice the power than most audio amplifiers today, still being extremely easy to connect to any mono or multiple phases mains. To absorb this enormous quantity of current the NXAMP4x4 reveals four independant high power full resonant power supplies working in opposite phase, thus cancelling noise and lowering EMC.

NXAMP4x1 uses advanced custom components based power amplifier design, the ultimate evolution of the Yamaha’s EEEngine technology, offering the sonic purity of conventional class AB but a heat dissipation equaling the class D. Not only the two dual-core DSPs are taking care of the amplifier protection and optimization, but they also redefine the processing standard of NEXO proprietary loudspeaker management technology to a higher sonic performance and reliability level.

With useful features such as full computerless front panel operation, on the fly independant louspeaker per output selection or load monitoring trough GPIO or Ethersound™/AES/EBU/Dante™ network for safety installation, the NXAMP4x1 is ideal for a wide variety of demanding applications

Key Features

  • Ultra flexible true four channels digital processing and amplification solution offering a perfect match to any NEXO speakers
  • Among the industry’s most powerful four channels amplifiers
  • Cost effective integration of command, control, protection and amplification of all NEXO speakers systems
  • Lighter and requires less rack space than conventional amplifier-processor systems
  • Eliminates unnecessary A/D conversion
  • Optional Dante™, EtherSound™ or AES/EBU network cards


Number of channels4x amplifiers channels, 2 by 2 bridgeable
Max. output voltage (no load)4x 105 Volts
Max. output power (8Ω)4 x 600 Watts
Max. output power (4Ω)4 x 900 Watts
Max. output power (2Ω)4 x 1300 Watts
Power consumption (Standby)10 Watts
Power consumption (Idle)100 Watts
Power consumption (1/8 Power)1100 Watts
Frequency response+0.5 dB from 10 Hz to 20 KHz
Input impedance / Max. level20 KΩ / +28 dBU
Dynamic range / TDH + N105 dB unweighted / Typical 0.1% on a flat setup
Latency500 us on a flat setup
A to D ConvertersAudio and current/voltage sense lines : 24 bits @ 48 KHz
ProcessingTwo dual-core 24 bits fixed point DSP with 56 bits accumulator


Analog audio inputs4x balanced analogue inputs on XLR3 with a second XLR3 for link
Power outputs4x Neutrik Speakon NL-4 outputs
RS232 port1x DB-9 connector for firmware upgrade and accessories connection
GPIO port1x DB-25 connector with 5x Global Purpose Inputs and 8x Global Purpose Outputs5x Global Purpose Inputs and 8x Global Purpose Outputs
Expansion slotFor networking audio cards, 4x digital audio inputs and remote control
Dimensions3U 19" Rack - 457 mm (18") Depth
Weight16.5 Kg (33lbs) net