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.
the crossover components (right),
to be mounted on a small wooden board.
Kit without cabinet, price per speaker EUR 54,00 excl. VAT: € 45.38 / $ 53.09
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 / $ 58.01
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)