CT 287   Shelf speaker as in K+T 5/2016

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 90 dB
  • size (HxWxD): 498 x 232 x 301 mm
  • frequency range (-8dB): - Hz
  • crossover frequency(s): Hz
  • speaker type: bass reflex

CT 287 is a compact speaker with coaxial driver. A Sica LP 165.25/270CX is employed.

CT286 is developed by Oliver Martin.

The Sica coaxial loudspeaker is deliveed with built in crossover. An additionally coil and a parallel connected resistor is used in series to the coax to smooth the frequency response.

The frequency response of this speaker are very linear. The decay spectrum is nearly perfect. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are lower than 0.2% above 400 Hz and stays below 0.5% at 95 dB at 1 m.

Our kit consists of

  • Sica LP 165.25/270 CX 4 Ohm
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 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)
  • 2m Speaker cable 2x1.5 mm2, transparent
  • 0,5x Pan screws 4x20 black, cross recess, 8 pieces
  • Plan for DIY kit

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

  • 0.7 mm air core coil, 0.56 mH/0.55 Ohm
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)

Kit without cabinet, price per speaker   EUR 54,00 excl. VAT: € 45.38 / $ 51.73

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.

Kit with high-end-crossover without cabinet, price per speaker   EUR 59,00 excl. VAT: € 49.58 / $ 56.52

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 / $ 3.54
We recommend one board per kit (two boards for a speaker pair)


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