CT 297   Shelf speaker as in K+T 3/2018

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): dB
  • size (HxWxD): 320 x 260 x 180 mm
  • frequency range (-8dB): 50 - 20000 Hz
  • crossover frequency(s): 220 Hz
  • speaker type: closed box

CT297 is a two way wall-mounted speaker.

CT297 is a closed-cabinet loudspeaker with drivers of Visaton .

The kit is delivered with the following drivers:
- a Visaton FRS 8 M full range driver
- a Visaton W 130 X woofer

The loudspeaker has been developed by Holger Barske and Thomas Schmidt.

The crossover consists of:
- a 2nd order high-pass filter (12 dB per octave slope) for the full range driver In series there is a trap filter..
- a 2nd order low-pass filter (12 dB per octave slope) for the woofer.

In the frequency response the trebles are strongly accentuated.

The decay spectrum is nearly perfect.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 1% above 300 Hz and doesn't exceed 2,5% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • 2x Visaton FRS 8 M, 8 Ohm
  • Visaton W 130 X, 2x 4 Ohm
  • Damping Sonofil 100 x 35 cm for 20 litres
  • 3m Speaker cable 2x1.5 mm2, transparent
  • 0,5x SuM-pan-4x12-verz
  • Plan for DIY kit

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

  • 2x Audaphon MKT CAP 5.6 uF / 160 Vdc
  • 2x Mundorf, electrolytic capacitor, etched, 150 uF/63 Vdc
  • 2x Mundorf, electrolytic capacitor, unetched, 22uF / 70 Vdc
  • 2x Mundorf ferrite core coil F71 1mH/0.46Ohm
  • 2x ferrite core coil 4.7 mH
  • 2x Mundorf H core coil H71, 5.6 mH/0.62 0hm
  • 2x Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)
  • 2x Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet and without amplifier, price per speaker   EUR 146,00 excl. VAT: € 122.69 / $ 138.64

In the Kit the ampifier and player are not included.

universal PCB

If you prefer to mount the crossover components on a universal PCB instead on wood
PCB 150x115 mm, tin plated, price per unit:   EUR 4,70 excl. VAT: € 3.95 / $ 4.46
We recommend one board per kit (2 boards per speaker pair)


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