CT 327   Floorstanding as in K+T 6/2023

Technical data
  • impedance: 6 Ohm
  • sensivity (2,83V/1m): 84 dB
  • size (HxWxD): 1100 x 200 x 180 mm
  • frequency range (-8dB): 48 - 22000 Hz
  • crossover frequency(s): 1700 Hz
  • speaker type: bass reflex

CT 327 is a two way floorstanding speaker.

CT 327 is a bass-reflex cabinet loudspeaker with drivers of Visaton .

The kit is delivered with the following drivers:
- a Visaton FRS 5 X, 8Ohm full range driver
- a Visaton W 130 S, 8Ohm woofer

The loudspeaker has been developed by Thomas Schmidt.

The crossover consists of:
- a 3rd order high-pass filter (18 dB per octave slope) for the full range driver.
- a 3rd order low-pass filter (18 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 0,7% above 300 Hz and doesn't exceed 1,1% at 95 dB at 1 m between 300 and 15000 Hz.

An excerpt from the Klang+Ton review (Translation of the author into English)

Conclusion of the magazine Klang+Ton:

Our kit consists of

  • Visaton FRS 5X, 8 Ohm
  • Visaton W130 S, 8 Ohm
  • Bass reflex tube BR30, 32x63 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • Damping Sonofil 100 x 35 cm for 20 litres
  • 0,5x Foam N25, 97,5x49x4 cm, black
  • 2x Binding Post PK31, gold plated (one pair, red and black)
  • 2m 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 MKP CAP Superior 3.3 μF / 400 Vdc
  • Audaphon MKP CAP Superior 10 μF / 400 Vdc
  • 2x JB, electrolytic capacitor, bipolar advanced, 33μF / 50 Vdc
  • 1.0 mm air core coil, 0.39 mH/0.29 Ohm
  • 1.0 mm air core coil, 0.82 mH/0.44 Ohm
  • 0.7 mm air core coil, 0.39 mH/0.49 Ohm
  • ceramic resistor 2.2 Ohm/10 Watt
  • ceramic resistor 5.6 Ohm/10 Watt
  • ceramic resistor 10 Ohm/10 Watt

Kit without cabinet, price per speaker   EUR 119,00 excl. VAT: € 100.00 / $ 108.00

! The 3D printed waveguide is not included in the kit

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

  • ClarityCap ESA capacitor 3.3 μF / 250 Vdc
  • ClarityCap ESA capacitor 10 μF / 250 Vdc
  • 2x Audaphon MKT CAP 33 μF / 160 Vdc
  • Mundorf baked varnish air core coil BL71, 0.39 mH/0.51 Ohm
  • Mundorf baked varnish air core coil BL100, 0.39 mH/0.29 Ohm
  • Mundorf baked varnish air core coil BL100, 0.82 mH/0.45 Ohm
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)
  • Metal-oxide resistor, 10W 10 Ohm (brown-black-black)

Kit with high-end-crossover without cabinet, price per speaker   EUR 168,00 excl. VAT: € 141.18 / $ 152.47

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).

  • Audaphon MKT CAP 22 μF / 160 Vdc
  • 0.7 mm air core coil, 0.10 mH/0.27 Ohm
  • ceramic resistor 4.7 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 12,20 excl. VAT: € 10.25 / $ 11.07

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 / $ 3.81
We recommend one board per kit (two boards for a speaker pair)


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