CT 280   Shelf speaker as in K+T 5/2015

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 83 dB
  • size (HxWxD): 350 x 210 x 270 mm
  • frequency range (-8dB): 50 - 20000 Hz
  • crossover frequency(s): Hz
  • speaker type: bass reflex

CT 280 is a low-cost kit. It is a 2 way floorstanding speaker with Visaton haut-parleurs CT 280 has been developed by Alexander Gressler.

The crossover consists of a second order high-pass filter (12 dB per octave slope) for the tweeter and for the woofer a first order low-pass filter (6 dB per octave slope) .

The frequency response of this loudspeaker is quite linear on axis. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are lower than 1% above 300 Hz.

Our kit consists of

  • Woofer 491614049103 (LPT130-19-100)
  • Aurasound FT1-81-8
  • Bass reflex tube HP50, 50x145 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,25x Damping Sonofil 100 x 35 cm for 20 litres
  • 0,5x Foam N25-30, 100 x 50 cm, black
  • Terminal T56/56DB for 2 connections
  • 1,5m Speaker cable 2x1.5 mm2, transparent
  • 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 MKT CAP 3.3 uF / 160 Vdc
  • Audaphon MKT CAP 4.7 uF / 160 Vdc
  • 1.0 mm air core coil, 2.7 mH/0.93 Ohm
  • 0.7 mm air core coil, 0.10 mH/0.27 Ohm
  • 0.7 mm air core coil, 0.39 mH/0.49 Ohm
  • Metal-oxide resistor, 5W 4.7 Ohm (yellow-violet-gold)
  • Metal-oxide resistor, 5W 6.8 Ohm (blue-grey-gold)

Kit without cabinet, price per speaker   - not available

Kit with high-end crossover

Kit without cabinet, price per speaker   - not available

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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