CT 281   Floorstanding as in K+T 5/2015

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 88 dB
  • size (HxWxD): 977 x 152 x 172 mm
  • frequency range (-8dB): 70 - 21000 Hz
  • crossover frequency(s): 4000 Hz
  • speaker type: bass reflex

CT 281 is a low-cost kit with Visaton drivers: A tweeter and two fullrange drivers. CT 281 has been developed by Thomas Schmidt.

The crossover consists of a second order high-pass filter (12 dB per octave slope) for the tweeter and for the two fullrange drivers a second order low-pass filter (12 dB per octave slope) .

The frequency response of this speaker is balanced. The decay spectrum is nearly perfect. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are lower than 0.5% above 300 Hz and rises not over 1% at 95 dB at 1 m.

Our kit consists of

  • 2x Visaton FR 10, 8 Ohm
  • Visaton DTW 72, 8 Ohm
  • Bass reflex tube HP50, 50x145 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • Damping Sonofil 100 x 35 cm for 20 litres
  • 0,5x Foam N25-30, 100 x 50 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 MKP CAP Superior 3.9 uF / 400 Vdc
  • Audaphon MKP CAP Superior 8.2 uF / 400 Vdc
  • 1.0 mm air core coil, 0.82 mH/0.44 Ohm
  • 0.7 mm air core coil, 0.27 mH/0.44 Ohm
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)

Kit without cabinet, price per speaker   EUR 78,00 excl. VAT: € 65.55 / $ 76.03

Kit with high-end crossover

The high-end kit comes with an ClarityCap ESA capacitor instead of an Audaphon MKP capacitor. All inductances are baked varnished 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.

Kit without cabinet, price per speaker   EUR 87,00 excl. VAT: € 73.11 / $ 84.81

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 / $ 3.61
We recommend one boards per kit (two boards for a speaker pair)


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