Fokus   Floorstanding as in K+T 1/2019

Technical data
  • impedance: 6 Ohm
  • sensivity (2,83V/1m): 88 dB
  • size (HxWxD): 1000 x 320 x 278 mm
  • frequency range (-8dB): 32 - 21000 Hz
  • crossover frequency(s): 480, 2900 Hz
  • speaker type: bass reflex

Fokus is a three way floorstanding speaker.

Fokus is a bass-reflex cabinet loudspeaker with drivers of Davis .

The kit is delivered with the following drivers:
- a Davis TW26GR tweeter
- a Davis 13 MP5GR mids driver
- a Davis 20 MP8GR woofer

The loudspeaker has been developed by Thomas Schmidt and Holger Barske.

The crossover consists of:
- a 2nd order high-pass filter (12 dB per octave slope) for the tweeter.
- a band pass consisting of a 3rd order high pass filter (18 dB per octave slope) and a 2nd order low-pass filter (12 dB per octave slope) for the mids-woofer.
- a 2nd order low-pass filter (12 dB per octave slope) for the woofer.

The frequency response of this speaker is nearly linear.

The decay spectrum is perfect.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 2% above 200 Hz and doesn't exceed 3,5% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Davis tweeter TW 26G, 120 W / 4000 Hz, cellulose
  • Davis 13 MP5GR
  • Davis 20 MP8 GR
  • Bass reflex tube BR25.50, black
  • 0,5x MUHWOLLE/1000
  • 1,5x 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
  • 2,5x Pan screws 4x20 black, 8 pieces
  • Plan for DIY kit

the crossover components (right),
to be mounted on a small wooden board.

  • ClarityCap PWA capacitor 12 μF; / 160 Vdc
  • ClarityCap PWA capacitor 15 μF; / 160 Vdc
  • ClarityCap PWA capacitor 47 μF; / 160 Vdc
  • Audaphon MKT CAP 22 μF; / 160 Vdc
  • Audaphon MKT CAP 47 μF; / 160 Vdc
  • 1.0 mm air core coil, 0.68 mH/0.39 Ohm
  • 0.7 mm air core coil, 0.56 mH/0.55 Ohm
  • Mundorf bs140 core coil 5.6mH/0.26Ohm
  • 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 3.9 Ohm (orange-white-gold)
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)
  • Metal-oxide resistor, 10W 22 Ohm (red-red-black)

Kit without cabinet, price per speaker   EUR 531,00 excl. VAT: € 446.22 / $ 495.30

Kit with high-end crossover

The high-end kit is delivered with baked varnish air core coils on important parts of the crossover for minimizing microphonic effects. - The current flow through the coil creates a magnetic field which sets the reel of wire in motion. This motion induces a voltage in the coil which adds itself to the signal. The stiffer the reel of wire is, the less the signal will be altered. The capacitors for the Davis TW26GR are of type polypropylen (MKP) Clarity-Cap CSA 630 V.

Kit with high-end-crossover without cabinet, price per speaker   EUR 624,00 excl. VAT: € 524.37 / $ 582.05

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 21,00 excl. VAT: € 17.65 / $ 19.59

universal PCB

If you prefer to mount the crossover components on a universal PCB instead on wood
PCB 220x155 mm, order no. I-8805002, price per unit:   EUR 11,70 excl. VAT: € 9.83 / $ 10.91
We recommend one board per kit (2 boards per speaker pair)


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