The K2 – K4 series is equally versatile in both portable and installed sound systems, is suitable for small and medium power solution, is flexible and cost-effective.

Example of compact power is the K4C with its 4 channels deliver up to 6000 W in 2RU 10.5 kg / 23.1 lb.

The K series is GREEN POWER, efficiency means eco-friendly, and in other words, money saving in elettricity; the minimum heat dissipation makes the K series suitable for hot places or the conditioning demands is strongly reduced.

The mechanical and chassy design solution are totally new, and can provide rubustness and long term durabily, thanks to 3mm side ears steel and the use of all parts zinc plated steel. The coating is elegant and durable polyester.

Since 1984 KIND AUDIO amplifiers have a reputation of “well sounding products”, is true, the original designer Alessandro Cortese (mr. Kind) still the head in the company and with his old school of audiophile continue to take great care of this important matter; also the K series is sonically superior compared to many pro audio amps, they have a reference sound.

Years of experience and patient development of the modulator (heart of our Class D circutry) have resulted in outstanding 20 Hz – 20 kHz audio performance, plus complete protection from normal hazards of the professional use. The most pronounced “sonic signature” of the K series is the great headroom, sailing through even the most difficult loads with no signs of stress or change of tonality.

Front accessible dust filter for easy and fast unit maintenance. Three input connectors type, as Neutrik Combo™ (XLR and 1/4”jack) and 3-pin terminal block, offers professional, semi-pro and installations connection way.

A dedicated model the K4HZ and few others in the K2 – K4 serie have the ability to directly drive 70 V / 100 V distributed loudspeakers.

The DSP version provides on-board DSP. The high-performance DSP is hidden inside and safe against accidental or intentional tampering; amplifier settings can be done via USB Analog Devices Sigma Studio. Locally lets the user access up to 8 presets per pushbutton on the rear panel.

The K series comes with four (4) years warranty, and like any other KIND AUDIO amplifier is entirely thinked, designed, and handcrafted in ITALY.

• Compact and space saving 4 channels up to 6000 W – 2RU – 10.5 kg / 23.1 lb

• GREEN POWER: high efficiency means minimal operational cost of elettricity, power cable distributions demands and thermal emission (BTU)

• Switch mode power supply internally selectable 230 / 115 V nominal

• Reference sound: Class D output circuit fixed frequency carefully designed for sonic transparency

• Capability to DIRECT drive 70 / 100 V distributed line

• Model K4HZ, 4 x 500 W loads Low-Z 2/4/8 ohms and Hi-Z 70 / 100 V

• Channels pair bridgeable

• Two selectable input gains (26 dB, 32 dB)

• Selectable low-freq. Filters (30Hz or 75Hz)

• Balanced Neutrik Combo™ (XLR, 1/4 TRS) and 3-pin Europlug (Phoenix) Inputs per channel

• Neutrik Speakon™ (with Bi-Wiring connection) Outputs

• Recessed stepped level attenuators

• Temperature controlled variable speed fans, front to rear airflow

• Maintenance with front accessible dust filter

• Fully protected design against: power supply AC mains outside operating voltage range; limiter prevents hard clipped waveforms to reach loudspeakers; DC and infrasonic signal at the outputs; VHF (destructive non audible) high frequency signals at the outpus; Short circuit on the outputs with auto reset; Thermal stress and overload, mutes outputs when power devices reach 85 °C / 185 °F, with automatic reset.

• Craftsmen built in Galliate (NO), Italy

• Full four (4) years warranty

• Also available with integrated DSP

Number of amplifier channels2
Total burst power all channels4000 W
Max output power single channelEIAJ test standard, 1 kHz, 1% THD
2 ohms2000 W
4 ohms1500 W
8 ohms900 W
Hi-Z 70 V (note 1)1200 W
Hi-Z 100 V (note 1)1500 W
Max output power bridgedEIAJ test standard, 1 kHz, 1% THD
4 ohms4000 W
8 ohms3000 W
Max output votage / current135 V /59 A
Protection featuresShort Circuit Protection, Current-Clip Limiter, Voltage Clip Limiter, Temperature protection
Amplifier audio performance
Gain, selectable26 dB, 32 dB (factory set)
Input sensitivity @ 4 ohms1.95 V
Max input level20dBu
Frequency response20 Hz - 20 kHz (1 W @ 8 Ohm - +/- 0.5dB
S/N ratio (20 Hz - 20 kHz)>106 dBA
Output circuitryClass D
Input impedance 10k balanced
THD+N<0.3% from 1W to 0.5dB below clip (typically <0.1%)
Front panel
Indicators(LED) Active, Protect, Hi temp, DSP option, signal out -35 dB, -20 dB, -10 dB, Limiter
ControlsMains switch, Gain control (per channel)
MaintenanceRemovable dust filter holder
Rear panel
Audio signal input connectors (per channel)XLR female combo 1/4 phone jack TRS, 3-pin terminal block (balanced)
Loudspeakers output connectorsNeutrik Speakon NL4MD (per channel)
NetworkingData port hole for DSP option
AC mains cordset / chassis connectorSchuko CEE 7/7 16 A / Direct
Controls(switch) HPF 30 Hz or 75 Hz, Link/Bridge, Analog or AES3
AC mains power
Power supplySwitch mode power supply, internally switchable 230 / 115 V nominal
Operating voltage100-240 V +/-10%, 50-60 Hz
Current draw@ 230 V / @ 115 V
Idle0.6 A / 0.7 A
1/8 of max output power@ 4 ohms2.6 A /4.8 A
1/4 of max output power@ 4 ohms4.7 A / 8.9 A
ThermalOperating temperature 0° - 40° C / 32° - 104° F
Dissipation and cooling Fan, continuosly variable speed, temperature and load current controlled, front to rear airflow
Idle220 BTU/h | 55 kcal/h
1/8 of max output power@ 4 ohms539 BTU/h | 136 kcal/h
1/4 of max output power@ 4 ohms859 BTU/h | 216 kcal/h
Chassis construction1.0 mm / 0.04" zinc steel chassis with removable dust filter holder; 3mm / 0.12" front panel ears and side reinforcement with rear support
DimensionsW 483 mm / 19", H 89 mm / 2 RU, D 390 mm / 15.4" from front mounting rails
Weight8.5 kg / 18.7lb
Note 1) 75Hz HPF enabled for this use
Note 2) Load tapped 1200 W
Note 3) Load tapped 800 W
DSP (optional)Available in the MODEL Kxx DSP
A/D converterNA
D/A converterNA
Frequency response @ -3dB7 Hz - 22 kHz
THD< 0.01% (20 Hz - 20 kHz)
PresetsBank of 8 presets selectable from rear panel, setup and upload via USB with AD sigma studio.
Delay for time alignement10 ms per output
Crossover filtersButterworth, Linkwitz-Riley, Bessel, from 6 dB/oct to 48 dB/oct
Output equalizerup to 12 biquad fully parametric per channel: peaking, hi/lo shelving, hi/lo pass, band pass, band stop, all pass
Input equalizerup to 5 biquad filters: PEQ, shelving, band pass, band stop, all pass
LimitersPeak limiter, RMS limiter, frequency dependent RMS limiter


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