55 plus   Shelf speaker as in K+T 6/2019

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 78 dB
  • size (HxWxD): 90 x 1200 x 170 mm
  • frequency range (-8dB): 30 - 25000 Hz
  • crossover frequency(s): 220 Hz
  • speaker type: closed box

55 plus is a two way compact speaker (sound bar).

55 plus is a closed-cabinet loudspeaker with drivers of Visaton .

The kit is delivered with the following drivers:
- Two fullrange speaker Visaton FRS 5 X, 8 Ohm
- a Visaton W 130 X, 2x 4 Ohm woofer

The loudspeaker has been developed by Thomas Schmidt and Holger Barske.

The crossover consists of:
- a 2nd order high-pass filter (12 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 mostly linear.

The decay spectrum is nearly perfect.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 1% above 300 Hz and doesn't exceed 1,4% at 95 dB at 1 m between 300 and 15000 Hz.

  • 2x Visaton FRS 5X, 8 Ohm
  • Visaton W 130 X, 2x 4 Ohm
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,25x Damping Sonofil 100 x 35 cm for 20 litres
  • 2x Binding Post PK31, gold plated (one pair, red and black)
  • 3m Speaker cable 2x1.5 mm2, transparent
  • Pan screws 4x20 black, 8 pieces
  • Plan for DIY kit

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

  • 2x Audaphon MKT CAP 4.7 μF / 160 Vdc
  • 4x Audaphon MKT CAP 22 μF / 160 Vdc
  • 2x Mundorf, electrolytic capacitor, etched, 220 μF/63 Vdc
  • 2x 1.0 mm air core coil, 1.0 mH/0.49 Ohm
  • 2x 1.0 mm air core coil, 3.0 mH/0.98 Ohm
  • 2x Mundorf H core coil H71, 3.9 mH/0.5 0hm
  • 2x Metal-oxide resistor, 10W 3.9 Ohm (orange-white-gold)
  • 2x Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)
  • 2x Metal-oxide resistor, 10W 10 Ohm (brown-black-black)

Kit without cabinet, price per speaker   EUR 242,00 excl. VAT: € 203.36 / $ 219.63

The in the Klang + Ton magazine presented amplifier 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, 8 Ohm are of type polypropylen (MKP) Audaphon 400 V.

Kit with high-end-crossover without cabinet, price per speaker   EUR 301,00 excl. VAT: € 252.94 / $ 273.18

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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