DD   Floorstanding as in K+T 6/2015

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 93 dB
  • size (HxWxD): 956 x 536 x 250 mm
  • frequency range (-8dB): 50 - 28000 Hz
  • crossover frequency(s): 400, 3000 Hz
  • speaker type: closed box

DD (standing for dynamic duo) is a 3 way floorstanding loudspeaker with closed bassrange system that employs two woofers Visaton W250 S, 8 Ohm. On top is a satellit cabinet with tweeter Visaton G 25 FFL and mid-woofer Visaton W 170S.

DD has been developed by Holger Barske and Thomas Schmidt.

The crossover consists of a 3rd order high-pass filter (18 dB per octave slope) for the tweeter, a bandpass filter (12 dB high - and 12 dB lowpass) for the mid-woofer. The two woofers are connected to a 2nd order low-pass filter.

Between 80 Hz and 20000 Hz, the frequency response of this loudspeaker is linear on axis, with a loudness sounding. The decay spectrum is nearly perfect except a resonance at 1200 Hz. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are lower than 1% above 200 Hz and below 2% at 95 dB at 1 m .

Our kit consists of

  • Tweeter Visaton G 25 FFL, 8 Ohm
  • mid-woofer Visaton W170 S, 4 Ohm.
  • 2x woofer Visaton W250 S, 8 Ohm
  • 3x Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • PE sealing tape, 5x2 mm, 7.5 m
  • 5x Damping Sonofil 100 x 35 cm for 20 litres
  • 3x Binding Post PK31, gold plated (one pair, red and black)
  • 5m Speaker cable 2x2.5 mm2, transparent
  • Visaton Countersunk screws 3.5x25, 24 pcs
  • 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 MKP CAP Superior 6.8 uF / 400 Vdc
  • Audaphon MKT CAP 15 uF / 160 Vdc
  • Audaphon MKT CAP 33 uF / 160 Vdc
  • Audaphon MKT CAP 68 uF / 160 Vdc
  • Mundorf, electrolytic capacitor, unetched, 33uF / 70 Vdc
  • Mundorf, electrolytic capacitor, unetched, 47uF / 70 Vdc
  • Mundorf air core coil L140, 3.0 mH/0.55 Ohm
  • 0.7 mm air core coil, 0.18 mH/0.36 Ohm
  • 0.7 mm air core coil, 0.39 mH/0.49 Ohm
  • Mundorf H core coil H50, 5.6 mH/1.11 0hm
  • Metal-oxide resistor, 10W 2.2 Ohm (red-red-gold)
  • Metal-oxide resistor, 10W 3.9 Ohm (orange-white-gold)
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   EUR 390,00 excl. VAT: € 327.73 / $ 380.17

Kit with high-end crossover

The high-end kit comes with ClarityCap PX capacitors for the tweeter. The important inductances are baked varnish air core coil 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.

Kit without cabinet, price per speaker   EUR 433,00 excl. VAT: € 363.87 / $ 422.08

universal PCB

If you prefer to mount the crossover components on a 240 x 165 mm universal PCB instead on wood:
Universal PCB RA240, order no.. I-2767, price per unit:   EUR 7,60 excl. VAT: € 6.39 / $ 7.41
We recommend one plate for one kit (for a pair of speakers you need 2 plates)


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