VisaFAST   Shelf speaker as in Hobby Hifi 6/2022

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 81 dB
  • size (HxWxD): 360 x 180 x 250 mm
  • frequency range (-8dB): 30 - 21000 Hz
  • crossover frequency(s): 1250 Hz
  • speaker type: bass reflex

VisaFAST is a two way compact speaker.

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

The kit is delivered with the following drivers:
- a Visaton BF 32 S, 4 Ohm full range driver
- a Visaton KT 100 V, 4 Ohm woofer

The loudspeaker has been developed by Bernd Timmermanns.

The crossover consists of:
- a 3rd order high-pass filter (18 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 medium volume, i.e. 90 dB at 1 m, the nonlinear distortions are below 3,5% above 300 Hz.

Our kit consists of

  • Visaton KT 100 V, 4 Ohm
  • Visaton BF 32 S, 4 OHM
  • Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • Binding Post PK31, gold plated (one pair, red and black)
  • 1,5m Speaker cable 2x1.5 mm2, transparent
  • 0,5x Pan screws 4x20 black, torx, 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.

  • Jantzen Cross Cap MKP capacitor 4.7 μF / 400V
  • Audaphon MKT CAP 3.3 μF / 160 Vdc
  • JB, electrolytic capacitor, bipolar advanced, 15μF / 50 Vdc
  • JB, electrolytic capacitor, bipolar advanced, 22μF / 50 Vdc
  • JB, electrolytic capacitor, bipolar advanced, 47μF / 50 Vdc
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • Mundorf H core coil H100, 1.5 mH/0.17 0hm
  • Metal-oxide resistor, 5W 1.0 Ohm (brown-black-gold)

Kit without cabinet, price per speaker   EUR 92,00 excl. VAT: € 77.31 / $ 89.68

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 BF 32 S, 4 Ohm are of type polypropylen (MKP) Audaphon MKP CAP Superior 400 V.

  • Jantzen Cross Cap MKP capacitor 3.3 μF / 400V
  • Jantzen Cross Cap MKP capacitor 4.7 μF / 400V
  • JB, electrolytic capacitor, bipolar advanced, 15μF / 50 Vdc
  • JB, electrolytic capacitor, bipolar advanced, 22μF / 50 Vdc
  • JB, electrolytic capacitor, bipolar advanced, 47μF / 50 Vdc
  • Mundorf baked varnish air core coil BL71, 0.47 mH/0.57 Ohm
  • Mundorf H core baked varnish coil BH100, 1.5 mH/0.17 0hm
  • Metal-oxide resistor, 5W 1.0 Ohm (brown-black-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 101,00 excl. VAT: € 84.87 / $ 98.45

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).

  • JB, electrolytic capacitor, bipolar advanced, 33μF / 50 Vdc
  • 0.7 mm air core coil, 1.0 mH/0.88 Ohm
  • ceramic resistor 6.8 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 14,30 excl. VAT: € 12.02 / $ 13.94

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.. str-RA160, price per unit:   EUR 5,90 excl. VAT: € 4.96 / $ 5.75
We recommend a half board per kit (one board for a speaker pair)


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