BK83-SOL (FE83-SOL)   Floorstanding as in Hobby Hifi 5/2017

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 85 dB
  • size (HxWxD): 824 x 130 x 248 mm
  • frequency range (-8dB): 45 - 22000 Hz
  • crossover frequency(s): Hz
  • speaker type: de bocina

BK83-SOL is a floorstanding loudspeaker with a full range driver.

BK83-SOL is a horn loudspeaker with drivers of Fostex .

The kit is available with three different Fostex full range drivers:

The kit is delivered with a Fostex FE 83 SOL fullrange driver driver

The loudspeaker has been developed by Bernd Timmermanns.

The crossover consists of two notch filters to reduce the loudness in the mid and highrange.

The frequency response is not flat but in total nearly linear. The decay spectrum as shown in the waterfall diagram show resonances at 2 kHz. Elsewhere it is free of disturbing resonances. At a volume of 90 dB at 1 m, the nonlinear distortions are lower than 2% above 300 Hz.

Our kit consists of

  • Fostex FE 83 SOL, 3 inch, full range driver, 8 Ohm
  • 0,25x Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x1.5 mm2, transparent
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 3.3 uF / 400 Vdc
  • Audaphon MKP CAP Superior 22 uF / 400 Vdc
  • 1.0 mm air core coil, 0.10 mH/0.14 Ohm
  • 1.0 mm air core coil, 0.39 mH/0.29 Ohm
  • Metal-oxide resistor, 10W 6.8 Ohm (blue-grey-gold)
  • Metal-oxide resistor, 5W 4.7 Ohm (yellow-violet-gold)

Kit without cabinet, price per speaker   EUR 110,00 excl. VAT: € 92.44 / $ 104.45

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 fullrange driver are of type polypropylen (MKP) Mundorf EVO Oil.

Kit with high-end-crossover without cabinet, price per speaker   EUR 138,00 excl. VAT: € 115.97 / $ 131.04

universal PCB

If you prefer to mount the crossover components on a 140 x 102 mm universal PCB instead on wood:
Universal PCB RA140, order no.. I-2765, price per unit:   EUR 3,70 excl. VAT: € 3.11 / $ 3.51
We recommend one board per kit (two boards for a speaker pair)


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