CT 304   Floorstanding as in K+T 4/2019

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 88 dB
  • size (HxWxD): 1000 x 180 x 258 mm
  • frequency range (-8dB): 45 - 21000 Hz
  • crossover frequency(s): 180, 1800 Hz
  • speaker type: bass reflex

CT 304 is a two way floorstanding speaker.

CT 304 is a bass-reflex cabinet loudspeaker with drivers of Scan Speak and Visaton.

The kit is delivered with the following drivers:
- a Scan Speak H2606-92000 tweeter
- a Visaton W 130 S 8 Ohm midrange / bass driver
- a Visaton W 130 S 8 Ohm woofer

The loudspeaker has been developed by Thomas Schmidt.

The crossover consists of:
- a 2nd order high-pass filter (12 dB per octave slope) for the tweeter.
- a 2nd order low-pass filter (12 dB per octave slope) for the mids-woofer.
- a 2nd order low-pass filter (12 dB per octave slope) for the woofer.

The frequency response of this speaker is nearly linear.

The decay spectrum is nearly perfect.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 0,7% above 200 Hz and doesn't exceed 1% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Scan Speak tweeter H2606-920000
  • 2x Visaton W130 S, 8 Ohm
  • Bass reflex tube HP70 XL, 70x220 mm, black
  • 2x Damping Sonofil 100 x 35 cm for 20 litres
  • 0,5x Foam N25, 100x50x4 cm, black
  • Binding Post PK31, gold plated (one pair, red and black)
  • 3m Speaker cable 2x1.5 mm2, transparent
  • 0,5x Pan screws 3.5x17 black, 8 pieces
  • 1,5x Visaton Countersunk screws 3.5x25, 8 pcs
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 1.0 uF / 400 Vdc
  • Audaphon MKP CAP Superior 4.7 uF / 400 Vdc
  • Audaphon MKT CAP 15 uF / 160 Vdc
  • Audaphon MKT CAP 33 uF / 160 Vdc
  • Mundorf, electrolytic capacitor, etched, 220 uF/63 Vdc
  • 1.0 mm air core coil, 1.0 mH/0.49 Ohm
  • 0.7 mm air core coil, 0.39 mH/0.49 Ohm
  • Mundorf H core coil H71, 10 mH/0.87 0hm
  • Mundorf H core coil H100, 6.8 mH/0.46 0hm
  • ceramic resistor 4.7 Ohm/20 Watt
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   EUR 195,00 excl. VAT: € 163.87 / $ 181.89

Kit with high-end crossover

The high-end kit is delivered with baked varnish air core coils on important parts of the crossover 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 capacitor for the Scan Speak H2606-92000 is of type polypropylen (MKP) Clarity-Cap ESA 250.

Kit with high-end-crossover without cabinet, price per speaker   EUR 208,00 excl. VAT: € 174.79 / $ 194.02

universal PCB

If you prefer to mount the crossover components on a 159 x 127 mm universal PCB instead on wood:
Universal PCB RA160, order no.. I-2766, price per unit:   EUR 5,10 excl. VAT: € 4.29 / $ 4.76
We recommend one board per kit (two boards for a speaker pair)


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