BK 103, Floorstanding   as in Hobby Hifi 4/2014

Technical data
- impedance: 8 Ohm
- sensivity (2,83V/1m): 88 dB
- size (HxWxD): 845 x 182 x 405 mm
- frequency range (-8dB): 50 - 20000 Hz
- crossover frequency(s): Hz
- speaker type: Horn

BK103 is a backloaded horn. It is a design of Fostex, Japan. To flatten the frequency response of the speaker Bernd Timmermanns added a crossover.

The fullrange speaker Fostex FE103 En is used in the floorstander.

The crossover contains two wave traps in series to the speaker.
 

  

Our kit consists of

  • Fostex FE 103En, full range speaker
  • 0,25x Audaphon Damping 10, 970 x 470 mm, adhesive
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x2.5 mm2, transparent
  • Pan screws 4x20 black, cross recess, 4 pieces
  • Plan for DIY kit

the crossover components (right),
to be mounted on a piece of wood

  • Mundorf, electrolytic capacitor, unetched, 10 uF / 70 Vdc
  • Mundorf, electrolytic capacitor, unetched, 33uF / 70 Vdc
  • 1.4 mm air core coil, 0.22 mH/0.12 Ohm
  • 1.4 mm air core coil, 0.56 mH/0.20 Ohm
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)
  • Metal-oxide resistor, 10W 10 Ohm (brown-black-black)

Kit without cabinet, price per speaker EUR 109,00 excl. VAT: € 91.60 / $ 106.25

Kit with high-end crossover

The kit with high-end crossover contains Mundorf baked varnish air core coils. As capacitor only ClarityCap, Series PWA capacitiors are used.

  • ClarityCap PWA capacitor 10 uF / 250 Vdc
  • ClarityCap PWA capacitor 33 uF / 250 Vdc
  • Mundorf baked varnish air core coil BL140, 0.22 mH/0.12 Ohm
  • Mundorf baked varnish air core coil BL140, 0.56 mH/0.20 Ohm
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)
  • Metal-oxide resistor, 10W 10 Ohm (brown-black-black)

Kit with high-end-crossover without cabinet, price per speaker EUR 134,00 excl. VAT: € 112.61 / $ 130.62

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).

  • Audaphon MKT CAP 10 uF / 160 Vdc
  • Metal-oxide resistor, 10W 10 Ohm (brown-black-black)


Price per impedance correction for one speaker, to be mounted on a small wooden board.   EUR 4,55 excl. VAT: € 3.82 / $ 4.44

universal PCB

If you prefer to mount the crossover components on a 159 x 127 mm universal PCB instead on wood:
Universal PCB RA160, order no.. I-2766, price per unit: EUR 5,10 excl. VAT: € 4.29 / $ 4.97
We recommend one board per kit (two boards for a speaker pair)
 


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