CT 310   Shelf speaker as in K+T 4/2020

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 84 dB
  • size (HxWxD): 320 x 196 x 250 mm
  • frequency range (-8dB): 60 - 21000 Hz
  • crossover frequency(s): 1000 Hz
  • speaker type: bass reflex

CT 310 is a two way compact speaker.

CT 310 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 full range driver
- a Visaton W 130 S 8 Ohm woofer

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

The crossover consists of:
- a 2nd order high-pass filter (12 dB per octave slope) for the full range driver.
- 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 (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 0,6% above 300 Hz and doesn't exceed 0,8% at 95 dB at 1 m between 300 and 15000 Hz.

An excerpt from the Klang+Ton review

Our kit consists of

  • Visaton FRS 5X, 8 Ohm
  • Visaton W130 S, 8 Ohm
  • Bass reflex tube HP35, 35x123mm, black
  • 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)
  • 1,5m Speaker cable 2x1.5 mm2, transparent
  • Visaton Countersunk screws 3.5x25, 8 pcs
  • Plan for DIY kit

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

  • Audaphon MKT CAP 15 μF; / 160 Vdc
  • JB, electrolytic capacitor, bipolar advanced, 33 μF / 50 Vdc
  • 1.0 mm air core coil, 2.2 mH/0.83 Ohm
  • 0.7 mm air core coil, 0.68 mH/0.70 Ohm
  • Metal-oxide resistor, 10W 3.9 Ohm (orange-white-gold)

Kit without cabinet, price per speaker   EUR 106,00 excl. VAT: € 89.08 / $ 95.31

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) Audaphon 400 V.

  • Audaphon MKP CAP Superior 15 μF; / 400 Vdc
  • Audaphon MKT CAP 33 μF; / 160 Vdc
  • Mundorf baked varnish air core coil BL71, 0.68 mH/0.71 Ohm
  • Mundorf baked varnish air core coil BL100, 2.2 mH/0.83 Ohm
  • Metal-oxide resistor, 10W 3.9 Ohm (orange-white-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 122,00 excl. VAT: € 102.52 / $ 109.70

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 / $ 3.78
We recommend one board per kit (two boards for a speaker pair)

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