CT 317   Shelf speaker as in K+T 5/2021

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 84 dB
  • size (HxWxD): 307 x 124 x 241 mm
  • frequency range (-8dB): 70 - 30000 Hz
  • crossover frequency(s): Hz
  • speaker type: Horn reflex

CT 317 is a compact loudspeaker with a full range driver.

CT 317 is a horn loudspeaker with drivers of Visaton .

The kit is delivered with a Visaton B 80 full range driver

The loudspeaker has been developed by Thomas Schmidt.

The crossover consists of:
- a blocking circuit in series with the full range driver.

The frequency response of this speaker is mostly linear.

The decay spectrum is nearly perfect.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 1% above 400 Hz and doesn't exceed 1% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Visaton B 80
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,25x Damping Sonofil 100 x 35 cm for 20 litres
  • 0,25x Foam N25-30, 100 x 50 cm, black
  • Binding Post PK31, gold plated (one pair, red and black)
  • 1m Speaker cable 2x1.5 mm2, transparent
  • 0,5x Pan screws 3.5x17 black, torx, 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
  • 1.0 mm air core coil, 1.0 mH/0.49 Ohm
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   EUR 119,00 excl. VAT: € 100.00 / $ 106.00

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 Visaton B 80 are of type polypropylen (MKP) Clarity-Cap ESA 250 V.

  • ClarityCap ESA capacitor 5.6 μF / 250 Vdc
  • Mundorf baked varnish air core coil BL100, 1.0 mH/0.49 Ohm
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 133,00 excl. VAT: € 111.76 / $ 118.47

Impedance correction

If you want to use a valve amplifier with this speaker an impedance correction should be employed. In this case the component quality is less important; therefore, we offer only one kit (upon request higher quality components are available).

  • JB, electrolytic capacitor, bipolar advanced, 22μF / 100 Vdc
  • 0.7 mm air core coil, 0.27 mH/0.44 Ohm
  • Metal-oxide resistor, 10W 15 Ohm (brown-green-black)

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 9,10 excl. VAT: € 7.65 / $ 8.11

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.. str-RA140, price per unit:   EUR 4,20 excl. VAT: € 3.53 / $ 3.74
We recommend one board per kit (two boards for a speaker pair)


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