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TX 20

20.000 W 4-channel high-performance amplifier with on-board DSP

The NOVA TX20 is a 4-channel power amplifier, which offers a unique combination of power and audio performance, seamlessly combined with advanced DSP and network control. The TX20 delivers 5.000 watts per channel or 10.000 watts for a bridged pair. State of the art components and a finely optimised design results in generous power reserves that ensures pristine sound quality is maintained even under the most extreme conditions.

► Four channels of sonically pure Class D amplification
► Unique & precise 96kHz digital signal processing
► 4th generation SHARC DSP algorithms
► Over‐designed switch mode power supply
► 20.000 watts RMS total output (4 x 5.000 W RMS)
► Full front panel user interface
► Extensive NOVA.Net control software over Ethernet
► Analog, AES3 and digital network audio inputs (DANTE card as option)
► Powerful grouping & multi‐layer EQ
► Powerful drive module speaker-centric presets
► LIR Linear Phase crossovers
► Multi-stage peak & RMS limiters
► Virtual Xover limiter for passive systems
► PEQ & FIR equalisers on all inputs
► Ultra lightweighted (12.5 kg only)


NOVA.Net PC Application
The NOVA.Net „System Engineer“ PC app is much more than just a remote control panel for a TX20. The PC app and any
connected device(s) become intimately intertwined, faithfully duplicating any control adjustments whether they are made in
the application or on the front panel of the device itself. Adjust a gain control on the device, and watch the gain value in the
app smoothly slide in sympathy. Each input and each output can be named in the application. These names not only appear
for the user on the application control panels, but also show when scrolling through the inputs and outputs on the device
itself. Even a TX20 firmware update can be made easily via the network.

High Speed Interface
The TX20 includes a high speed ethernet communications interface that supports DHCP, static-IP and
auto-IP and direct connection to a computer without the need for a router or a switch.

AES3 and Digital Networked Audio
The TX20 offers a dual channel AES3 input as standard. The DANTE audio
networking card is available as option.

Drive Module Concept
The powerful drive module concept allows for abstraction from device centric to speaker based control. The TX20 uses drive module presets, which are defined as a number of outputs driven from one DSP input. This system allows for better flexibility and greater functionality when loading and storing presets. Drive modules allow for a less processor-centric and more speakerorientated system design. The TX20 allows 50 drive module presets to be stored. Presets are stored permanently inside the TX20 and so will always be available even if the TX20 is not being used with the NOVA.Net software.

General Specifications

Number of output channels:
Total power output, all channels driven:
Audio inputs:
Digital Signal Processing:
Control, monitoring and system status alarms:
Power‐save modes:
System standby and wakeup:


20.000 Watts RMS
4x Analogue, 2x AES3 and 4x Networked Audio Interface (DANTE card as option)
High performance 96kHz DSP on all inputs and outputs
Ethernet network, volt‐free relay and contact closure port
Standby after user defined time with fast wake up on audio, deep ECO sleep after user defined time with wake up on command
Front panel switch, network command and audio detection

Power Output

Power specification:
Crest Factor of 4 (12dB), 2‐Ohm nominal load:
Crest Factor of 2.8 (9dB), 4‐Ohm nominal load:
Crest Factor of 2 (6dB), 8‐Ohm nominal load:
Bridged, per channel pair, 4-Ohm load:
25V line (CV) operation, Crest Factor 4 (12dB):
70V line (CV) operation, Crest Factor 4 (12dB):
100V line (CV) operation, Crest Factor 4 (12dB):


RMS output power per channel, all channels driven with cont. program material & nominal ambient temperature of 40degC / 105degF
5.000 Watts
3.000 Watts
1.500 Watts
10.000 Watts
1.250 Watts
3.500 Watts
5.000 Watts

Audio Performance

Amplifier topology:
Amplifier modulation scheme:
Dynamic range (measured relative to amp output):
Gain (with all the DSP level controls set to 0dB):
Frequency response, 4 Ohm load:
Total harmonic distortion, THD:
Inter‐channel crosstalk, worst case combination:
Slew rate:
Damping factor (Ref 8 Ohms):
Maximum analogue input level:
Analogue input sensitivity range for full output:
Analogue input (four channels):
Analogue ground scheme:
AES3 input (two audio channels):
AES3 link (two audio channels):

AES3 supported sampling rates:


NOVA high performance Class-D
Low feedback, multiple loop, with feed‐forward error correction
Analogue input, better than 113dBA typical, AES / Networked Audio input, better than 114dBA typical
<7Hz to >30kHz, 4 Ohms, ‐2.5dB points
<0.05% typical, 1kHz signal, AES17 filter, 4 Ohm load
better than ‐85dBr at 1kHz and ‐75dBr at 10kHz
>60V per microsecond typical
>800 at amplifier output
0dBu to +20dBu, continuously adjustable
Input 20k Ohm, electronically balanced, link directly connected to input
AES48 standard compliant
Transformer isolated with unique active cable equalisation for extended range
Active AES3 signal regeneration. Automatic direct bypass to the AES3 input ensuring
the audio signal will still flow even when the amplifier is powered down
AES3 supported sampling rates 24kHz to 192kHz (auto locking)

Digital Signal Processing

Sample rate:
Physical inputs to DSP drive modules:
Drive module input processing:
Drive module output processing:
Preset management:
Class leading VX limiters:
Hardman crossover filters:
LIR crossover filters:


40 bit, NOVA proprietary algorithms
96kHz throughout
4x analogue, 2x AES & 4x DanteTM inputs can be routed to four DSP drive modules
Input signal routing, delay, gain, HPF, Phase, Mute, EQ: 2x low shelf, 6x PEQ / band pass and FIR shelving filters
Source, delay, gain, Phase, Mute, crossover filters, VX limiters, EQ: low shelf, 8x PEQ / band pass and shelving filters
10 snapshots for device wide setup, 50 presets for loudspeaker settings, presets can be recalled to sets of outputs or individual outputs
Twelve additional independent overlays of EQ, Delay and Gain, flexible grouping for effective control of amplifier channels in large systems
See the ‘speaker protection systems’ section
Better out of band rejection than Linkwitz‐Riley
Unique Linear Phase alignments without the compromises of FIR filters

Power Supply

Topology (main power supply):
Topology (auxiliary and standby supplies):
Internally stored energy:
Nominal mains input voltage range:
Mains input frequency range:
Mains inrush current (max for <10ms):


NOVA high performance Series Resonant
Low quiescent Eco‐Flyback
>600 Joules
85V to 240V, Power supply automatically detects voltage and configures accordingly
47Hz to 63Hz
6A at 115V, 12A at 230V

Protection Systems
Under all circumstances the control and protection systems will endeavour to deliver the maximum power possible for a given set of conditions, applying limiters only in extreme circumstances.
Muting will only occur when a dangerous situation is detected, normal operation automatically resuming when the condition clears. An inbuilt notification system is provided to indicate
problems to remote devices either via the network or the volt‐free changeover relay contacts accessible on the rear panel.

System protection
•  Excessive power supply current or amplifier output current
•  Excessive temperature per sub system: PSU, amplifier and DSP
•  Mains voltage within acceptable limits
•  Internal power rails producing correct output
•  Fans operating at correct speed

Power distribution protection systems
•  Mains inrush current limiting for soft start and anti‐surge
•  Mains average current limiting for mains breaker management
•  Randomised initialisation when remotely powered up

Monitoring, measurements recorded against time
•  Supply current
•  Supply voltage
•  Thermal capacity
•  Each driver current
•  Each driver impedance
•  Protection
•  Limiting for each output

Speaker protection
•  Sustained clipping prevention
•  DC offset protection
•  Excessive HF energy (VHF) limiter

VX audio output limiters
Vx provides a linear phase virtual crossover and two limiter paths on each output.
This unique system delivers effective protection for systems that incorporate
passive crossovers.

Vx Limit: Multiband peak limiter, two per output
Vx Max: Multiband overshoot limiter, two per output
X‐Max: Driver excursion limiter
T‐Max: Driver thermal limiter (long term power limiter)

Monitoring, device statistics and counters
Number of power cycles counted, number of mains brownout events counted,
fan speeds continuously monitored, fan under‐speed events counted,
various protection mute events counted, driver impedance continuously monitored


Analogue IN and LINK:
AES3 dual channel IN and LINK:
Amplifiers output:
Mains input connector:
Dante Primary and Secondary:
Relay output & contact closure inputs:
Front panel display:
Front panel encoders:
Front panel push buttons:
LED indicators:
Net Weight:


Cooling Dual vari‐speed fans, front to back airflow. Washable, tool‐less change filter media
Analogue IN and LINK 4x female and 4x male NeutrikTM XLR
AES3 dual channel IN and LINK 1x female and 1x male NeutrikTM XLR
Amplifiers output 4x Neutrik SpeakonTM NL4 connectors
Mains input connector Neutrik 32A PowerconTM
Dante Primary and Secondary 2x Shielded RJ45
Relay output & contact closure inputs PhoenixTM pluggable terminal block (mating plug supplied)
Front panel display Backlit, graphical, high contrast, daylight visible
Front panel encoders Two, detented, velocity sensitive
Front panel push buttons Large, tactile, illuminated
LED indicators Bright, easily differentiated
Enclosure Standard 19” 2U (88mm), 357mm (14”) deep with handles and optional rear support
12.5 kg

NOVA.Net PC Application


ZIP Software Download V7.00.17

Select Series

NOVA Preset Database for TX20

ZIP Version V1.90 (.dse file)


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