CT 292   Shelf speaker as in K+T 4/2017

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 85 dB
  • size (HxWxD): 286 x 168 x 240 mm
  • frequency range (-8dB): 48 - 22000 Hz
  • crossover frequency(s): 2200 Hz
  • speaker type: bass reflex

CT 292 is a two way compact speaker.

CT 292 is a bass-reflex cabinet loudspeaker with drivers of SB Acoustics .

The kit is delivered with the following drivers:
- a SB Acoustics SB19C000-4 tweeter
- a SB Acoustics SB13PFC25-4 midrange / bass driver

The loudspeaker has been developed by Thomas Schmidt.

The crossover consists of:
- a 3rd order high-pass filter (18 dB per octave slope) for the tweeter.
- a 3rd order low-pass filter (18 dB per octave slope) for the mids-woofer.

… The decay spectrum as shown in the waterfall diagram is free of disturbing resonances. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are lower than 0.8% above 300 Hz and doesn't exceed 1.2% at 95 dB at 1 m between 200 and 10000 Hz.

Conclusion of the magazine Klang+Ton:

Our kit consists of

  • SB Acoustics tweeter SB19ST-C000-4
  • SB Acoustics mids driver SB13PFC25-4
  • PE sealing tape, 5x2 mm
  • 0,5x Damping Sonofil 100 x 35 cm for 20 litres
  • 0,5x Audaphon Damping 10, 970 x 470 mm, adhesive
  • Spring loaded terminal T56 D
  • 2m Speaker cable 2x1.5 mm2, transparent
  • Pan screws 3.5x17 black, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 5.6 μF / 400 Vdc
  • Audaphon MKP CAP Superior 6.8 μF / 400 Vdc
  • 3x MKT capacitor 15 μF / 250Vdc
  • 1.0 mm air core coil, 0.47 mH/0.32 Ohm
  • 1.0 mm air core coil, 0.68 mH/0.39 Ohm
  • 0.7 mm air core coil, 0.27 mH/0.44 Ohm
  • 0.7 mm air core coil, 1.8 mH/1.15 Ohm
  • Metal-oxide resistor, 10W 1.0 Ohm (brown-black-gold)
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)
  • Metal-oxide resistor, 10W 6.8 Ohm (blue-grey-gold)

Kit without cabinet, price per speaker   - not available

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. The capacitors are of type polypropylen (MKP) Audaphon capacitors of high quality.

Kit with high-end-crossover without cabinet, price per speaker   - not available

universal PCB

If you prefer to mount the crossover components on a 240 x 165 mm universal PCB instead on wood:
Universal PCB RA240, order no.. str-RA240, price per unit:   EUR 8,60 excl. VAT: € 7.23 / $ 7.44
We recommend two boards per kit (four boards for a speaker pair)


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