CHF 4'915.00
2x 9000W@2Ω, 2x 5200W@4Ω,2x 2700W@8Ω,12kg AES3/RS485 serial port

The K20 impresses with up to 18,000 W in a single rack space, making it probably the most powerful amplifier at its size, and definitely the most powerful model within the K Series, the most advanced line of power amplifiers from Powersoft. 

Ideal for subwoofers requiring relatively high continuous power and ample headroom, the K20 is the unique result of smart design, attention to sound quality, and extremely high efficiency with reliability, portability, and adaptability in mind.

In use worldwide by leading touring and event sound companies, K Series is preferred among the top ranking system designers, sound engineers, and system techs on the road for making their lives easier, giving them reliable premier-grade power and headroom in the smallest possible package size.

Fully digitally controlled and with a serial PC communication port as standard, the K20 is also available with KDSP board and KAESOP Ethernet/AES3 interface: the K20 DSP+AESOP amounts to a fully integrated, highly sophisticated yet easy to use power source including state-of-the-art sound shaping and system management capabilities, remotely controllable via Powersoft's Armonía Pro Audio Suite™ (Interface available for MediaMatrix, Crestron, AMX, Q-SYS control and monitoring systems).


Power supply

  • Advanced switch-mode worldwide operating power supply technology for high performance and compact size
  • Power Factor Correction PFC for extremely low mains consumption and extremely wide mains operating range
  • Low Inrush Limiting reduces AC inrush current, removing the need for expensive power sequencers

Fully protected circuit design with:

  • Ac protection: shut down power supply when AC mains voltage is outside operating range
  • Clip limiter: prevents severely clipped waveforms from reaching loudspeakers, while still maintaining full peak power output
  • DC protection: protects against infrasonic signal at the outputs
  • VHF protections: protects the loudspeakers against non audible, strong, non musical high frequency signals
  • Short circuit protection: protects the amplifier from short circuit or other stressful events for the output circuits with automatic protection reset
  • Long term limiter: protects the loudspeaker against steady long term rms (non audio) signals reducing maximum output
  • Thermal protection: output stages operating temperature up to 80 °C (176 °F)
  • Temperature controlled continous variable speed fan, front to back airflow
  • Temperature forecast with LCD traced historical behaviour


  • Fixed frequency switchmode output stage for high grade sound accuracy
  • Compact size - all models only 1 RU for reduced rack cost and space
  • Light weight - for easier racking and shipping: 12 kg (26.5 lbs) according to configuration
  • Combo XLR/6.3mm jack Neutrik input connectors with link capability
  • AES3 digital input*


  • LCD matrix interactive display
  • Comprehensive-user friendly front panel display menu
  • Built-in defeatable clip limiters for each channel
  • Digital gain-attenuator control
  • Defeatable gate selection for each channel
  • User selectable gain/sensitivity
  • User selectable maximum output power for each channel
  • User selectable maximum mains current draw
  • Lockable set-up by user selectable access key code
  • Built in remote control via the RS-485 interface provides full diagnostic, operational setting and system monitoring


  • Hardware monitor available for fast local diagnostic
  • Load impedance measurement / display for each channel
  • Output power measurements / display for each channel
  • Mains voltage and current measurements / display
  • Downloadable log file of functional fault events with time related trace
  • Smart Card settings, parameters and upgrades functionality

Digital Signal Processing*

  • Analog Devices SHARC® DSP architecture
  • AD/DA converter: dual 24bit @ 96 kHz Tandem® architecture, 127 dB dynamic range, per channel
  • Input/output independent equalizers per channel providing PEQ, raised cosine, shelving IIR filters as well as custom output FIR filters
  • Delay up to 1 s for time alignment
  • Active DampingControl™ for cable compensation
  • Power limiter (TruePower™, RMS voltage, RMS current) + Peak Limiter

Remote management*


Number of channels2
Output powerSingle channel mode Bridge mode
 2 Ω4 Ω8 Ω   4 Ω8 Ω  
 9000 W5200 W2700 W   18000W10400W  
Max output voltage / current225 Vpeak / 125 Apeak  450 Vpeak
AC Main Power 
Power supplyUniversal, regulated switch mode with PFC (Power Factor Correction)
Nominal power requirement100-240 V ±10%, 50-60 Hz
Operating voltage90 V - 264 V
Power consuption**115 V 230 V
Idle91 W1.3 A 88 W1.17 A
1/8 of max output power @ 4 Ω1650 W15.8 A 1625 W7.9 A
1/4 of max output power @ 4 Ω3250 W29.3 A 3250 W14.7 A
Operating temperature range0° - 45° C - 32° - 113° F
Thermal dissipation**115 V 230 V
Idle682 BTU/h171.9 kcal/h 682 BTU/h171.9 kcal/h
1/8 of max output power @ 4 Ω1590 BTU/h400.7 kcal/h 1590 BTU/h400.7 kcal/h
1/4 of max output power @ 4 Ω2498 BTU/h629.5 kcal/h 2498 BTU/h629.5 kcal/h
Gain26 dB29 dB32 dB35 dB
Input sensitivity7.37 V5.22 V3.68 V2.62 V
Max input level27 dBu24 dBu21 dBu18 dBu
Gate-52 dBu-55 dBu-58 dBu-61 dBu
Frequency response20 Hz - 20 kHz (±0.5 dB) @ 1 W, 8 Ω
S/N ratio> 110 dB (20 Hz - 20 kHz, A weighted)
Crosstalk separation> 66 dB @ 1kHz
THD+N< 0.5% from 1 W to full power (typically < 0.05%)
IMD< 0.5% from 1 W to full power (typically
Input impedance10 kΩ balanced
Slew rate50 V/μs @ 8Ω, input filter bypassed
Damping factor> 5000 @ 20-200 Hz
DSP architectureAnalog Devices SHARC® DSP
AD ConverterDual 24 bit 96 kHz Tandem® architecture with 127 dBA of dynamic range and THD
DA ConverterDual 24 bit 96 kHz Tandem® architecture with 122 dBA of dynamic range and THD
Internal precision40 bit floating point
FirmwareNetwork upgradable firmware
Memory/presets8 MB (RAM) plus 2 MB flash for presets / 50 stored locally + 150 stored on Smart Card
Latency6.0 ms fixed latency architecture
Input equalizerThree layers (PEQ, raised cosine, shelving), 32 filters each + group filters, up to 256 filters total
Output equalizer16 fully parametric filters per channel, IIR: peaking, hi/lo-shelving, hi/lo-pass, band-pass, band-stop, all-pass. Custom FIR up to 384 taps @ 48 or 96 kHz
CrossoverButterworth, Linkwitz-Riley, Bessel: 6 dB/oct to 48 dB/oct (IIR), linear phase (FIR), hybrid (FIR-IIR)
Delayup to 4 s on input section; up to 32 ms per output, sample-by-sample stepping
LimitersPower limiter, TruePower™, RMS voltage, RMS current + Peak limiter
Damping controlActive DampingControl™
Front panel 
Indicators and Controllers2 x LED bar - Signal level and over-temperature protection
4 x Push-button - Setting operating parameters
1 x Display - Settings and monitoring
1 x Power switch - 
AC main1 x AMP CPC 45A connector - 45 A max (region-specific power cord provided)
Audio signal input2 x Combo Jack/XLR-F - Signal input
1 x Analog/Digital input - Switchable Analog line/AES3 digital input on channel 2
Loudspeakers2 x speakON - Neutrik NL4MD
Network/data2 x Rj45 socket - Ethernet + AESOP connection (DSP+AESOP version only)
2 x Rj45 socket - Ethernet + AESOP connection (DSP+AESOP version only)
1 x Rj45 socket - RS485 data connection (non-DSP version)
Rear panel 
Indicators and Controllers1 x Push-button - Link channel pair
1 x Push-button - Toggle ANALOG input/AES3 input on selected connector
Dimensions (L x H x W)483 mm x 44.45 mm x 475 mm (19.0 in x 1.8 in x 18.7 in)
Weight12 kg (26.5 lb)
More Information
ACRpro SA Route de Veyrier 35 1227 Carouge shop[at]acrdirect.ch CHE-217.177.576 http://www.acrpro.ch/cg