SimBox   Shelf speaker as in K+T 2/2023

Technical data
  • impedance: 6 Ohm
  • sensivity (2,83V/1m): 82 dB
  • size (HxWxD): 320 x 190 x 280 mm
  • frequency range (-8dB): 50 - 30000 Hz
  • crossover frequency(s): 2300 Hz
  • speaker type: closed box

SimBox is a two way compact speaker.

SimBox is a closed-cabinet loudspeaker with drivers of Visaton .

The kit is delivered with the following drivers:
- a Visaton Tweeter G20 SC tweeter
- a Visaton AL 130 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 3rd order low-pass filter (18 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 0,6% above 300 Hz and doesn't exceed 2% at 95 dB at 1 m between 300 and 15000 Hz.

An excerpt from the Klang+Ton review (Translation of the author into English)

Conclusion of the magazine Klang+Ton:

Our kit consists of

  • Visaton tweeter G20 SC
  • Visaton woofer AL 130, 8 Ohm
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • Damping Sonofil 100 x 35 cm for 20 litres
  • 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
  • 0,5x 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 3.3 μF / 400 Vdc
  • Audaphon MKP CAP Superior 6.8 μF / 400 Vdc
  • Audaphon MKT CAP 10 μF / 160 Vdc
  • Audaphon MKT CAP 15 μF / 160 Vdc
  • 1.0 mm air core coil, 0.22 mH/0.21 Ohm
  • 1.0 mm air core coil, 1.5 mH/0.63 Ohm
  • 0.7 mm air core coil, 0.33 mH/0.48 Ohm
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • 2x Metal-oxide resistor, 10W 15 Ohm (brown-green-black)

Kit without cabinet, price per speaker   EUR 293,00 excl. VAT: € 246.22 / $ 265.92

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 Tweeter G20 SC are of type polypropylen (MKP) Clarity-Cap ESA 630 V.

  • ClarityCap ESA capacitor 3.3 μF / 630 Vdc
  • ClarityCap ESA capacitor 6.8 μF / 630 Vdc
  • Audaphon MKP CAP Superior 10 μF / 400 Vdc
  • Audaphon MKP CAP Superior 15 μF / 400 Vdc
  • Mundorf baked varnish air core coil BL71, 0.33 mH/0.48 Ohm
  • Mundorf baked varnish air core coil BL100, 0.22 mH/0.21 Ohm
  • Mundorf baked varnish air core coil BL100, 1.5 mH/0.62 Ohm
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • 2x Metal-oxide resistor, 10W 15 Ohm (brown-green-black)

Kit with high-end-crossover without cabinet, price per speaker   EUR 350,00 excl. VAT: € 294.12 / $ 317.65

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).

  • Audaphon MKT CAP 15 μF / 160 Vdc
  • 0.7 mm air core coil, 0.39 mH/0.49 Ohm
  • ceramic resistor 10 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 12,20 excl. VAT: € 10.25 / $ 11.07

universal PCB

If you prefer to mount the crossover components on a universal PCB instead on wood
PCB 150x115 mm, tin plated, price per unit:   EUR 4,70 excl. VAT: € 3.95 / $ 4.27
We recommend one board per kit (2 boards per speaker pair)


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