Ashly Nxp754 1U 4-Channel Multi-Mode Network Power Amplifier

by Ashly

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Ashly NXP754AD overview


The NXP754 4-Channel Multi-Mode Network Power Amplifier from Ashly is capable of driving 2, 4, and 8 Ohms loads at full power and offers a maximum rated output power of 75W per channel at 25V, 70V, and 100V modes. It comes pre-installed with a four-channel AES3 input card with pass-thru for digital audio and Dante network audio module. The Dante card enables access to digital audio networks at low latencies (83.3 μs) over Gigabit Ethernet. The Protea DSP (Digital Signal Processing) software is also included with this unit for dynamics, gain, equalization, matrix mixer, crossover, delay, and metering.



The amplifier features a lightweight 1U design with universal AC input SMPS for improved energy efficiency. It comes with additional energy saving features such as Real-Time Clock (RTC), Event Scheduler, and GPIO control. The multi-mode output capability allows each individual amplifier output channel to be set for Low-Impedance, or Constant Voltage operation using DIP switches. With the Euroblock, and IEC connectivity, this power amplifier safely fulfills the requirements for installed sound applications.

Energy Star compliant
Consumes less than 1W in the automatic sleep mode
DC-voltage level control
Network, Serial, and Logic control via Ashly Network remotes (available separately)
Protea DSP
Input Source Protea DSP Options: Analog, auto (net, AES3, analog)
Limiter Brick Wall Limiter
Threshold: -20 to 20 dBu
Ratio: Infinite
Attack: 0.2 to 50 ms/dB
Release: 5 to 1000 ms/dB
Compressor Threshold: -20 to +20 dBu
Ratio: 1.2:1 to infinite
Attack: 0.2 to 50 ms
Release 5 to 1000 ms/dB
Detector: Peak/Average
Attenuation Bus: 2 available
Metering: In, Out, Attenuation, Graphical
Controls Autoleveler Controls
Target Level: -40 to +20 dBu
Action: Gentle, Normal, Aggressive, User-Defined
Maximum Gain: 0 to +22 dB
Metering: Input, Gain, Attenuation
Ratio: 1.2:1 to 10:1
Threshold Below Target: -30 to 0 dB
Gain Increase/Decrease Rate: 5 to 1000 ms/dB
Hold Time: 0 to 6 sec
Ambient Noise Compensation Output only
Max Gain: -20 to +20 dB
Min/Base Gain: -40 to +20 dB
Gain Change Rate: 0.2 to 20 s/dB
Link Group: 16 available
ANC Input Channel: 1 to 2 or 1 to 4
Noise Threshold -40 to +20 dBu
Program/Ambient Gain Ratio; 0.3:1 to 3:1
Metering: Input level, Attenuation, Average noise
Ducking High/Low Priority, Trigger, Filibuster, Ducked Program
Trigger Threshold: -80 to +20 dBu
Ducking Release: 5 to 1000 ms/dB
Ducking Depth: 0 to -30 dB, -∞
Enable ducking at matrix mixer
Metering input
Gate Threshold: -80 to +20 dBu
Range: Off, 100 to 0 dB
Attack: 0.2 to 50 ms/dB
Release: 5 to 1000 ms/dB
Metering: Key signal, gate LED, graphical

Advanced Gate Controls
Key engage enable
Key Frequency: 20 Hz to 20 kHz
Key Bandwidth: 0.016 to 3.995 octave
Gain Gain (with / without VCA): -50 to 12 dB, off, polarity invert
Digital VCA Groups: 4 available
Remote RD8C Gain: Enable per channel, 0 dB to -∞
WR-5 (neWR-5) Remote Gain: 0 to -50 dB, mute
EQ Type For FIR Filter
Output only, 48 kHz only, 2-384 taps
File Type: .csv, .fir

For 31-Band
Filter Type: Constant Q or proportional
Bandwidth: 0.499 octave to 0.25 octave

For Parametric 2,4,6, or 10 Band
Frequency: 20 to 20 kHz
Level: -30 to 15 dB
Q Value: 92.436 to 0.267

For Hi / Low Shelf 6 / 12 dB/octave
Frequency: 20 Hz to 20 kHz
Level: -15 to 15 dB

For All Pass
Frequency: 20 Hz to 20 kHz

For Variable Q HP / LP
Frequency: 20 Hz to 20 kHz
Q Value: 3.047 to 0.267

For Notch / Bandpass
Frequency: 20 Hz to 20 kHz
Q Value: 92.436 to 0.267
Feedback 48 kHz Sampling Rate
12 x filters
In/Out per filter
Lock (per filter) and global lock
Filter Modes: Float, restricted, manual
Filter Type: Notch, parametric
Filter Frequency Range: 20 Hz to 20 kHz
Notch Filter: -∞
Parametric Filter: 15 to -30 dB
Filter Bandwidth 0.016 to 3.995 Octave
Detector Sensitivity: 5 levels
Float Time 5 minutes to 24 hours
Crossover 2 Way, 3 Way, 4 Way Crossover & High Pass / Low Pass Filters
Bessel & Butterworth Filters: 12 / 18 / 24 / 48 dB/octave
Linkwitz-Riley Filter: 12 / 24 / 48 dB / octave
Frequency: Off, 20 Hz to 20 kHz
Delay At 48 kHz Sampling Rate (Input Time, Distance & Temperature): 
Speaker Delay: 0 to 21 ms
Delay: 0 to 682 ms

At 96 kHz Sampling Rate (Input Time, Distance & Temperature): 
Speaker Delay: 0 to 10.6 ms
Delay: 0 to 341 ms
Audio Metering Range: -60 to 20 dBu
Increments: 1 dB
Peak Hold Indicator
Signal Generator Pink Noise, White Noise, Sine Wave
Signal Level: Off, -50 to 20 dBu
Sine Wave Frequency: 20 Hz to 12 kHz
Mixer Matrix Mixer: 
Gain (0.5 dB Increments): Off, -50 to 12 dB
Mute: Per channel
Auto-Mixer Enabled: Per channel
Global Auto-mixer Response: 0.01 to 2 sec
Enable Ducking at Mixer
Ducking LED: Per channel if enabled
Metering: Level, auto-mixer level
Processor Input A/D, Output D/A: 24 bit
DSP Processors: 32-bit floating point
Sample Rates: 48 kHz, 96 kHz
Propagation Delay @ 48 kHz: 1.42 ms
Propagation Delay @ 96 kHz: 0.71 ms