Classic Products


These sound systems are acoustic all-rounders. Passive and 'Self Powered' variants with integrated amplifier electronics. Durable, flexible and always reliable. Proven solutions for the highest requirements.

E 90 MK II

K&F E 90 MK II

Concentrated forces

The E 90 MK II is a 2-way passive speaker whose high-performance column speaker design makes it especially suitable for transmission in rooms with difficult acoustics. Column speakers are characterised by a concentration of vertical beam levels. The E 90 MK II already has this effect from 500 Hz, thereby noticeably reducing the reflections from the ceiling and floor. The lean design and technical properties of the system are extremely well-suited for acoustics in churches, lecture halls, sports and multi-purpose halls, community halls and conference rooms. The key difference to conventional point sources is immediately noticeable and impressive. Room acoustic challenges met masterfully!

Aesthetic clarity

The E 90 MK II is suitable for speech and music transmission and provide impressive sound in both low and high-impedance systems. If needed, the K&F subwoofers of the SONA and NOMOS series provide support in the low-frequency range. The system is optically integrated into both historical buildings and also modern glass and concrete architecture. The timeless design particularly appeals to users and architects due to the lean column form and the curved front panel. Looks good, sounds good!

Product overview

E 90 MK II: 4 x 5″/1 x 1″ 100° x 20° (H x V) low frequency
70° x 70° (H x V) high frequency



K&F E 90 MK II



  • 2-way high-power column loudspeaker loaded with 4 x 5″ and 1 x 1″ short horn
  • Vertical directivity from 300 Hz upwards
  • Good intelligibility and articulation even in reverberant rooms
  • For nearfield and medium throw applications
  • Self resetables protection circuits for maximum safety
  • 8 Ω and 100 V versions available


2-way passive-system, column loudspeaker
Operated with
Frequency response -10 dB
95 Hz – 20 kHz
Frequency response ±3 dB
140 Hz – 18 kHz
Nominal coverage angles
100° x 20° LF
70° x 70° HF (hor. x vert.)
Directivity index (DI)
9 (+3,5/-2,5) 800 Hz – 12 kHz
Power handling
150 Watt r.m.s.
Sensitivity 1 W/1 m
96 dB
122 dB (SPL peak/1 m)
4 x 5″ woofer
1 x 1″ soft-dome tweeter with ferrofluid on a short concentric horn
3,5 kHz 18 dB/Okt., automatic resetable tweeter and woofer protection
8 Ω, Zmin 7.7 Ω @ 300 Hz
2 x speakON® NL4MP (1+/1-)
Connectors 100 Volt version
Barrier strip or 2 x speakON® NL4MP
Trapezoidal enclosure 15 mm birch plywood with scratch proof polyurethane black or white paint, 3 x M6 internal T-Nuts compatible with variety of mounting hardware black painted perforated steel grille with black acoustical foam
Dimensions (W x H x D)
170 x 670 x 200 mm
9.5 kg
RAL 9005 (black)
RAL 9010 (white)
RAL Special Colour
'100 Volt' with 50/100/150 VA toroidal transformer (11.2 kg), 'Barrier strip' instead of speakON® connectors
1 Discontinued in October 2015