CT 290   Floorstanding as in K+T 2/2017

Technical data
  • impedance: 6 Ohm
  • sensivity (2,83V/1m): 91 dB
  • size (HxWxD): 1020 x 360 x 388 mm
  • frequency range (-8dB): 40 - 17000 Hz
  • crossover frequency(s): 250, 4000 Hz
  • speaker type: closed box

CT 290 is a 3 way floorstanding speaker with drivers from Visaton.

The kit is delivered with the Visaton W 300-8 Ohm woofer, the Visaton BG 17-8 Ohm midrange and Visaton TW 70-8 Ohm tweeter.

CT 290 is developed by Holger Barske and Thomas Schmidt.

The crossover consists of a 2nd order low-pass filter (12 dB per octave slope) for the woofer. The midrange driver is connected to a 12 dB band-pass filter, which consists of a 12 dB high-pass filter and a 12 dB low-pass filter. The tweeter is connected to a 2nd order high-pass filter (12 dB per octave slope).

The frequency response of this speaker is nearly linear on axis below 10 kHz. A slight sink in the frequency response at 1600 Hz should not disturb. The decay spectrum is without faults. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are mostly lower than 0.7 % above 200 Hz and stays below 1 % at 95 dB at 1 m .

Our kit consists of

  • Visaton BG 17, 8 Ohm
  • Visaton TW 70, 8 Ohm
  • Visaton W300, 8 Ohm
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 3,5x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 3m Speaker cable 2x1.5 mm2, transparent
  • Pan screws 3.5x17 black, cross recess, 8 pieces
  • Pan screws 4x20 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 3.3 μF / 400 Vdc
  • Audaphon MKT CAP 10 μF / 160 Vdc
  • Audaphon MKT CAP 47 μF / 160 Vdc
  • electrolytic capacitor, unetched, 100uF / 50 Vdc
  • 0.7 mm air core coil, 0.39 mH/0.49 Ohm
  • Audaphon M core coil M12, 1.0 mH/0.13 0hm
  • Audaphon M core coil M12, 2.2 mH/0.2 0hm
  • Monacor transformer coil LSI-56T, 5.6mH/0.15 Ohm
  • ceramic resistor 6.8 Ohm/20 Watt
  • Metal-oxide resistor, 10W 12 Ohm (brown-red-black)

Kit without cabinet, price per speaker   EUR 278,00 excl. VAT: € 233.61 / $ 249.97

Kit with high-end crossover

The high-end kit is delivered with two backlack 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 of type MKT or MKP. foil types and for the tweeter high quality Clarity Cap ESA 630V.

Kit with high-end-crossover without cabinet, price per speaker   EUR 344,00 excl. VAT: € 289.08 / $ 309.31

universal PCBs

If you prefer to mount the crossover components on a universal PCB instead on wood
PCB 220x155 mm, order no. I-8805002, price per unit:   EUR 11,80 excl. VAT: € 9.92 / $ 10.61
We recommend one board per kit (two boards for a speaker pair)

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