K+T 4-9-9   Floorstanding as in K+T 4/2018

Technical data
  • impedance: 6 Ohm
  • sensivity (2,83V/1m): 91 dB
  • size (HxWxD): 950 x 500 x 300 mm
  • frequency range (-8dB): 35 - 24000 Hz
  • crossover frequency(s): 180, 2500 Hz
  • speaker type: bass reflex

K+T 4-9-9 is a three way floorstanding speaker.

K+T 4-9-9 is a bass-reflex cabinet loudspeaker with drivers of Beyma .

The kit is delivered with the following drivers:
- a Beyma TPL-75 air motion transformer (ribbon-tweeter)
- a Beyma 6 G 40 FE mids driver
- a Beyma 12 WR 400 woofer

The loudspeaker has been developed by Thomas Schmidt.

The crossover consists of:
- a first order high-pass filter (6 dB per octave slope) for the tweeter.
- a band pass consisting of a 2nd order high pass filter (12 dB per octave slope) and a 3rd order low-pass filter (18 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 is nearly perfect.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 0,5% above 250 Hz and doesn't exceed 0,8% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Beyma AMT TPL-75, black
  • Beyma mids-woofer 6 G 40 FE, 170 Watt
  • Beyma woofer 12 WR 400, 400 Watt
  • Bass reflex tube HP100, 100x200 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 4x Damping Sonofil 100 x 35 cm for 20 litres
  • Foam N25, 100x50x4 cm, black
  • 3x Binding Post PK31, gold plated (one pair, red and black)
  • 3m Speaker cable 2x1.5 mm2, transparent
  • Allen wood screws, black, 5x30 mm, 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.

  • Audaphon MKP CAP Superior 4.7 uF / 400 Vdc
  • Audaphon MKT CAP 15 uF / 160 Vdc
  • Audaphon MKT CAP 100 uF / 160 Vdc
  • Mundorf, electrolytic capacitor, etched, 150 uF/63 Vdc
  • Mundorf, electrolytic capacitor, etched, 220 uF/63 Vdc
  • 1.0 mm air core coil, 0.39 mH/0.29 Ohm
  • 1.0 mm air core coil, 1.5 mH/0.63 Ohm
  • Mundorf bs140 core coil 15mH/0.48Ohm
  • Mundorf H core coil H71, 15 mH/1.15 0hm
  • Mundorf H core coil H71, 18 mH/1.28 0hm
  • 2x ceramic resistor 4.7 Ohm/20 Watt

Kit without cabinet, price per speaker   EUR 811,00 excl. VAT: € 681.51 / $ 790.55

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 capacitor for the tweeter is of type polypropylen (MKP) Clarity-Cap CSA 630 V.

Kit with high-end-crossover without cabinet, price per speaker   EUR 835,00 excl. VAT: € 701.68 / $ 813.95

universal PCB

If you prefer to mount the crossover components on a universal PCB instead on wood
PCB 220x155 mm, order no. I-8805002, price per unit:   EUR 11,70 excl. VAT: € 9.83 / $ 11.41
We recommend one board per kit (2 boards per speaker pair)


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