Klein-Phi 81/18   Floorstanding as in K+T 3/2014

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 94 dB
  • size (HxWxD): 1100 x 390 x 280 mm
  • frequency range (-8dB): 33 - 22000 Hz
  • crossover frequency(s): 450 Hz
  • speaker type: bass reflex

Klein-Phi is an impressive 2-way line array. One speaker consists of 8 fullrange drivers Visaton FRS 5X and two Monacor SPA-110PA woofers. It is developed by Holger Barske und Thomas Schmidt.

Our kit consists of

  • 8x Visaton fullrange FRS 5X, 8 Ohm
  • 2x Monacor SPA-110PA bass driver
  • PE sealing tape, 5x2 mm
  • 0,5x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 4m Speaker cable 2x1.5 mm2, transparent
  • Pan screws 3.5x17 black, cross recess, 16 pieces
  • Allen wood screws, black, 5x30 mm, 16 pieces
  • Plan for DIY kit

the crossover components (right),
to be mounted on a small wooden board.
  • Audaphon MKT CAP 3.9 μF / 160 Vdc
  • Audaphon MKT CAP 47 μF / 160 Vdc
  • electrolytic capacitor, etched, 330 μF/63 Vdc
  • 2x electrolytic capacitor, unetched, 100uF / 50 Vdc
  • 1.0 mm air core coil, 0.56 mH/0.36 Ohm
  • 1.4 mm air core coil, 3.9 mH/0.65 Ohm
  • Mundorf H core coil H71, 2.2 mH/0.38 0hm
  • Mundorf H core coil H71, 3.3 mH/0.47 0hm
  • Mundorf H core coil H71, 5.6 mH/0.62 0hm
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)
  • Metal-oxide resistor, 10W 2.7 Ohm (red-purple-gold)
  • Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)

Kit without cabinet, price per speaker   - not available

Kit with high-end crossover

In the kit with high end crossover Audaphon capacitors are used. All coils are designed as baked varnish air core coils to suppress vibrations in the coil.

Kit without cabinet, price per speaker   - not available

Impedance correction

If you want to use a valve amplifier with this speaker an impedance correction should be employed. In this case the component quality is less important; therefore, we offer only one kit (upon request higher quality components are available).


Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 36,00 excl. VAT: € 30.25 / $ 32.97

universal PCB

If you prefer to mount the crossover components on a 240 x 165 mm universal PCB instead on wood:
Universal PCB RA240, order no.. str-RA240, price per unit:   EUR 8,60 excl. VAT: € 7.23 / $ 7.88
We recommend one board per kit (two boards for a speaker pair)


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