Nexo NXAMP-4X1

Nexo's NXAMP 4X1 Powered TDControllers are based on an innovative design that provides the full integration of speaker and amplifier control that will provide a safety base and real-time performance that is the first of its kind, having all the parameters controlled by the DSP.  This real-time control will offer end users the ability to manage the voltage/current/temperature sense lines from the amplifier's output, protecting both the amplifier and its power supply in real time, while simultaneously offering all control parameters required for the speakers.

NXAMP technology is far more complex than a bundled power amplifier and loudspeaker controller.  More than two years of research yielded significant DSP innovations which allow multiple voltage/current/temperature sense lines, from the amplifier's output, to protect both the amplifier and power supply.

NXAMP power supplies are full resonance types with half bridge converters.  This exceptional design minimizes noise via Zero Current Switch (ZCS) technology.  On both NXAMP models, two converters work to synchronize the opposite phase, thus cancelling noise.  The benefits include unrivalled sonic performance and low EMC.

The NXAMP 4x1 amplifier employs YAMAHA’s EEEngine technology.  This technology offers the sonic purity of conventional class AB, but with a heat dissipation equaling class D technology.  In fact, NXAMP rails constantly follow the output signal needs, minimizing the required headroom (and wasted energy).

NXAMP’s final stage output transistor is customized for these devices via thin chip technology, with minimized thermal resistance, to reach 300 Volts.

Even though DSP protection is already used on the NXAMP 4x1, an Area of Safety Operation (ASO) limiter circuit is also included.  ASO limiting is done in analog, as the limiter attack required is too fast for digital protection and converter latency.

DSP Protection Features:

• Power-on protection (smooth start-up with in-rush limitation)
• Power-off protection (clean shut-down procedure)
• Peak Voltage limiter (clip limiting)
• Peak Current limiter
• VHF protection
• Integrate current limiter
• DC offset protection
• Short circuit protection
• Fan speed control
• Power Amp overheat protection
• SMPS overheat protection
• SMPS fault proection
• Power cable monitoring

Specifications:

• Number of amplifier channels: 4x channels, 2 by 2 bridgeable
• Max. output voltage (no load): 4 x 105 Volts
• Max. output power:
  8 Ohms: 4 x 600W
  4 Ohms: 4 x 900W
  2 Ohms: 4 x 1300W
• Power consumption:
  Standby: 10W
  Idle: 100W
  1/8 Power: 1100W
• Analog Input Channels: 4x channels, analog inputs on XLR 3 with a second XLR 3 for linking
• Frequency response: +/-0.5 dB from 10Hz-20kHz
• Input Impedance: 20 kOhms
• Max. Input Level: +28dBu
• Dynamic Range: All channels = 105dB unweighted
• THD + Noise: Typical 01% flat setup
• Latency time: 500us on a flat setup
• Power supply: Dedicated version for 100~120 Volts or 220~240 Volts
• Audio Inputs:
   - 4x balanced analogue inputs on XLR3 with a second XLR3 for linking, using 24bit converters.
   - 4x digital inputs via the optional network card slot at the back.
• Power Outputs: 4x Speakon outputs using internal power relay for automatic output assignment regarding setup
• RS232 port: Allow firmware upgrade for software improvement and new cabinet setups
• GPIO port: 5x Global Purpose Inputs and 8x Global Purpose Outputs for simple remote control and monitoring
• Processing: Two DSPs, 24bit data with 48bit accumulator. 700MIPS
• Front Panel: On/Off Main switch, Select Wheel, Menu A and Menu B buttons, 40 characters by 2 lines display.  Amp
  protect, Stand-by and power LED’s. For each channel: volume indicator (15x LEDs), Individual Mute buttons and red LED, output current signal green LED, Speaker Protection yellow LED, Amp. Peak red LED.
• Rear Panel: 1 mains socket; RS232 serial communications connector; GPIO port, Expansion slot for networking audio extension card, 4 XLR inputs with link and 4 Speakon 4 outputs.
• Dimensions: 3RU High x 18" D x 19” Wide
• Weight: 33 lbs. (16.5 kg)
• System Selection: Allows control across all NEXO ranges.
• System Set-up: Within the selected range, if possible, allows cabinets to be set for passive or active mode, wideband or crossover mode, choose among available crossover point, cardioid or supercardioid mode.
• Protection: Multiple Peak Limiters fitted for both selected cabinet and amplifier. Multiple Acceleration, Displacement and Temperature protections on every channel. Inter-channel regulation.
• Delay: Up to 330 ft. (150m) of delay in 0.4" (10cm) steps
• Input Patching: Allows any of the 4x analogue (or digital) inputs combination to be routed on each output.
• Output Gain: Global and inter-channel gain ±6dB in 0.5dB steps.
• Volume control: Each channel with 16x steps from – inf dB to 0dB.
• Save/Recall: Set-up Stores up to 40x user set-ups; On-the-fly recall, without mute or glitches for instant comparison.
• Array EQ: LF or HF shelving filters to compensate ground or stacking effects, ±6dB, frequency factory tuned.
• Security Mode: Password protected for Read-Only or Remote-Only Mode.
• Remote control: Full remote control via the Ethersound protocol and ESmonitor software.
• Certification: UL, SEMKO (CE), CCC, KOREA, TSS, PSE
• Green status: Compliant with ROHS and WEEE directive