CT 285 (FAST)   Floorstanding as in K+T 3/2016

Technical data
  • impedance: 6 Ohm
  • sensivity (2,83V/1m): 88 dB
  • size (HxWxD): 960 x 238 x 330 mm
  • frequency range (-8dB): 40 - 21000 Hz
  • crossover frequency(s): 400 Hz
  • speaker type: bass reflex

CT 285-FAST is a F.A.S.T (fullrange and subwoofer technologie) floorstanding speaker with a fullrange driver for the high and mids and a bigger fullrange driver for the bass range.

CT285-FAST is developed by Holger Barske and Thomas Schmidt.

The cabinet contains two full range loudspeakers: the small Visaton FRS 5X and the bigger Visaton BG 20. With both there are three different variants:

The crossover consists of a second order high-pass filter (12 dB per octave slope) for the full range loudspeaker. A serial RCL is smoothing the frequency response. The woofer is connected to a 2nd order low-pass filter.

The frequency response of this speaker is linear. The decay spectrum is good. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are not higher than 1% between 300 Hz and 10 000 Hz and doesn't exceed 1,5% at 95 dB at 1 m.

Our kit consists of

  • Visaton FRS 5X, 8 Ohm
  • Visaton BG 20, 8 Ohm
  • Bass reflex tube HP70, 68x160 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 3x Damping Sonofil 100 x 35 cm for 20 litres
  • 0,5x Foam N25, 100x50x4 cm, black
  • Binding Post PK31, gold plated (one pair, red and black)
  • 3m Speaker cable 2x1.5 mm2, transparent
  • 1,5x Pan screws 3.5x17 black, cross recess, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKT CAP 3.9 uF / 160 Vdc
  • Mundorf, electrolytic capacitor, unetched, 33uF / 70 Vdc
  • Mundorf, electrolytic capacitor, unetched, 56uF / 50 Vdc
  • 1.0 mm air core coil, 2.2 mH/0.89 Ohm
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • Mundorf H core coil H100, 5.6 mH/0.39 0hm
  • Metal-oxide resistor, 10W 1.5 Ohm (brown-green-gold)

Kit without cabinet, price per speaker   EUR 114,00 excl. VAT: € 95.80 / $ 112.08

Important: The costomised ring for the Visaton FRS 5X is not included in our kit.

Kit with high-end crossover

The high-end kit is delivered with baked varnish air core coils 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. All capacitors are foil capacitors of type MKP (polypropylen).

Kit with high-end-crossover without cabinet, price per speaker   EUR 142,00 excl. VAT: € 119.33 / $ 139.61

universal PCBs

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 / $ 3.64
We recommend one board per kit (two boards for a speaker pair)


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