CT 315   Shelf speaker as in K+T 3/2021

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 86 dB
  • size (HxWxD): 420 x 198 x 257 mm
  • frequency range (-8dB): 50 - 30000 Hz
  • crossover frequency(s): Hz
  • speaker type: Horn reflex

CT 315 is a compact loudspeaker with a full range driver.

CT 315 is a bass-reflex cabinet loudspeaker with drivers of Visaton .

The kit is delivered with a Visaton B 100, 6 Ohm full range driver

The loudspeaker has been developed by Thomas Schmidt.

The crossover consists of:
- a first order low-pass filter (6 dB per octave slope) for the full range driver.

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 0,4% above 400 Hz and doesn't exceed 0,7% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Visaton full range driver B 100 - 6 Ohm
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,5x Damping Sonofil 100 x 35 cm for 20 litres
  • 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.

  • ClarityCap PWA capacitor 1.2 μF / 160 Vdc
  • 1.0 mm air core coil, 0.47 mH/0.32 Ohm
  • 1.0 mm air core coil, 0.82 mH/0.44 Ohm
  • MOX10-resistor 5.6 Ohm/10 Watt (green-blue-gold)

Kit without cabinet, price per speaker   EUR 117,00 excl. VAT: € 98.32 / $ 114.05

Kit with high-end crossover

The high-end kit is delivered with Mundorf CFC 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.

  • ClarityCap PWA capacitor 1.2 μF / 160 Vdc
  • Mundorf copper foil coil CFC16-0.82mH/0.29Ohm
  • Mundorf baked varnish air core coil BL100, 0.47 mH/0.32 Ohm
  • MOX10-resistor 5.6 Ohm/10 Watt (green-blue-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 146,00 excl. VAT: € 122.69 / $ 142.32

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).

  • Audaphon MKT CAP 15 μF / 160 Vdc
  • JB, electrolytic capacitor, bipolar, 220 μF/50 Vdc
  • Mundorf H core coil H50, 10 mH/1.8 0hm
  • ceramic resistor 10 Ohm/20 Watt
  • ceramic resistor 15 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 24,60 excl. VAT: € 20.67 / $ 23.98

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 / $ 4.09
We recommend one board per kit (two boards for a speaker pair)


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