CT 318   Floorstanding as in K+T 6/2021

Technical data
  • impedance: 6 Ohm
  • sensivity (2,83V/1m): 77 dB
  • size (HxWxD): 800 x 700 x 2000 mm
  • frequency range (-8dB): 30 - 30000 Hz
  • crossover frequency(s): 4000 Hz
  • speaker type: dipol

CT 318 is an open (Dipol) two way floorstanding speaker with coax driver.

CT 318 is a dipole loudspeaker with drivers of Reckhorn .

The kit is delivered with the following drivers:
- a Reckhorn C-191 coaxial driver

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

The crossover consists of:
- a 2nd order high-pass filter (12 dB per octave slope) for the tweeter.
- a blocking circuit in series with the woofer.

The frequency response of this speaker is mostly linear.

The decay spectrum (waterfall spectrum) shows a decelerated swing-out behaviour in the mid-range.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 1% above 300 Hz and doesn't exceed 2,6% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Reckhorn C-191
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • Binding post terminal PK2-LS, gold plated
  • 2m Speaker cable 2x1.5 mm2, transparent
  • Countersunk screws 3.5x16 black, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 1.8 μF / 400 Vdc
  • Audaphon MKT CAP 22 μF / 160 Vdc
  • 0.7 mm air core coil, 0.33 mH/0.48 Ohm
  • Mundorf H core coil H100, 5.6 mH/0.39 0hm
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)
  • Metal-oxide resistor, 10W 15 Ohm (brown-green-black)

Kit without cabinet, price per speaker   EUR 135,00 excl. VAT: € 113.45 / $ 127.06

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 capacitors for the Reckhorn C-191 Hochtöner are of type polypropylen (MKP) Clarity-Cap ESA 630 V.

  • ClarityCap ESA capacitor 1.8 μF / 630 Vdc
  • Audaphon MKP CAP Superior 22 μF / 400 Vdc
  • Mundorf baked varnish air core coil BL71, 0.33 mH/0.48 Ohm
  • Mundorf H core baked varnish coil BH100, 5.6 mH/0.39 0hm
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)
  • Metal-oxide resistor, 10W 15 Ohm (brown-green-black)

Kit with high-end-crossover without cabinet, price per speaker   EUR 156,00 excl. VAT: € 131.09 / $ 146.82

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 / $ 4.42
We recommend one board per kit (2 boards per speaker pair)


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