CT 306   Floorstanding as in K+T 6/2019

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 79 dB
  • size (HxWxD): 1000 x 260 x 260 mm
  • frequency range (-8dB): 28 - 21000 Hz
  • crossover frequency(s): 180, 6000 Hz
  • speaker type: dipol

CT 306 is a two and a half way floorstanding speaker.

CT 306 is a dipole loudspeaker with drivers of Dynavox .

The kit is delivered with the following drivers:
- a Dynavox DX159 tweeter
- a Dynavox DY131-9A midrange / bass driver
- a Dynavox DY200-9A 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 tweeter.
- a 2nd order low-pass filter (12 dB per octave slope) for the mids-woofer.
- 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 1% above 300 Hz and doesn't exceed 1,6% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Dynavox 130mm Woofer 8 Ohm DY131-9A
  • Dynavox Tweeter DX159
  • Dynavox 200 mm Woofer 8 Ohm DY200-9A
  • Binding post terminal PK2-LS, gold plated
  • 2m Speaker cable 2x1.5 mm2, transparent
  • 1,5x Pan screws 3.5x17 black, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 1.0 uF / 400 Vdc
  • Audaphon MKP CAP Superior 1.5 uF / 400 Vdc
  • Audaphon MKT CAP 5.6 uF / 160 Vdc
  • Audaphon MKT CAP 6.8 uF / 160 Vdc
  • Mundorf, electrolytic capacitor, etched, 150 uF/63 Vdc
  • 1.0 mm air core coil, 1.5 mH/0.63 Ohm
  • 0.7 mm air core coil, 0.15 mH/0.28 Ohm
  • Mundorf H core coil H100, 3.9 mH/0.3 0hm
  • Mundorf H core coil H100, 6.8 mH/0.46 0hm
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)
  • Metal-oxide resistor, 10W 2.7 Ohm (red-purple-gold)
  • Metal-oxide resistor, 10W 6.8 Ohm (blue-grey-gold)

Kit without cabinet, price per speaker   EUR 96,00 excl. VAT: € 80.67 / $ 89.55

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 Dynavox DX159 are of type polypropylen (MKP) Clarity-Cap ESA 630 V.

Kit with high-end-crossover without cabinet, price per speaker   EUR 125,00 excl. VAT: € 105.04 / $ 116.60

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).

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 9,92 excl. VAT: € 8.34 / $ 9.25

universal PCB

If you prefer to mount the crossover components on a 159 x 127 mm universal PCB instead on wood:
Universal PCB RA160, order no.. I-2766, price per unit:   EUR 5,10 excl. VAT: € 4.29 / $ 4.76
We recommend one board per kit (two boards for a speaker pair)


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