CT 320   Shelf speaker as in K+T 2/2022

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 84 dB
  • size (HxWxD): 290 x 160 x 165 mm
  • frequency range (-8dB): 70 - 25000 Hz
  • crossover frequency(s): 2800 Hz
  • speaker type: bass reflex

CT 320 is a two way compact speaker.

CT 320 is a bass-reflex cabinet loudspeaker with drivers of Visaton .

The kit is delivered with the following drivers:
- a Visaton FRS 5 X, 8 Ohm tweeter
- a Visaton W 100 S, 4 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 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 0,5% above 500 Hz and doesn't exceed 1,5% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Visaton FRS 5X, 8 Ohm
  • Visaton W100 S, 4 Ohm
  • Bass reflex tube BR30, 32x63 mm, black
  • 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, 97,5x49x4 cm, black
  • Binding Post PK31, gold plated (one pair, red and black)
  • 1,5m Speaker cable 2x1.5 mm2, transparent
  • Pan screws 4x20 black, torx, 8 pieces
  • Visaton Countersunk screws 3.5x25, 8 pcs
  • Plan for DIY kit

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

  • 2x Audaphon MKP CAP Superior 1.0 μF / 400 Vdc
  • Audaphon MKP CAP Superior 5.6 μF / 400 Vdc
  • Audaphon MKT CAP 15 μF / 160 Vdc
  • 1.0 mm air core coil, 1.0 mH/0.49 Ohm
  • 0.7 mm air core coil, 0.27 mH/0.44 Ohm
  • Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   EUR 92,00 excl. VAT: € 77.31 / $ 77.31

The mounting ring for the tweeter must be made by yourself and is not included in the kit.

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 for the Visaton FRS 5 X, 8 Ohm are of type polypropylen (MKP) Clarity-Cap ESA 250 V.

  • ClarityCap ESA capacitor 5.6 μF / 250 Vdc
  • 2x Audaphon MKP CAP Superior 1.0 μF / 400 Vdc
  • Audaphon MKP CAP Superior 15 μF / 400 Vdc
  • Mundorf baked varnish air core coil BL71, 0.27 mH/0.45 Ohm
  • Mundorf baked varnish air core coil BL100, 1.0 mH/0.49 Ohm
  • Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 109,00 excl. VAT: € 91.60 / $ 91.60

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, 33μF / 50 Vdc
  • 0.7 mm air core coil, 0.33 mH/0.48 Ohm
  • ceramic resistor 4.7 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 9,50 excl. VAT: € 7.98 / $ 7.98

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 / $ 3.53
We recommend one board per kit (two boards for a speaker pair)


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