Mikro Desktop   Shelf speaker as in Hobby Hifi 3/2016

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 81 dB
  • size (HxWxD): 180 x 100 x 150 mm
  • frequency range (-8dB): 160 - 40000 Hz
  • crossover frequency(s): Hz
  • speaker type: closed box

Mikro Desktop is a small loudspeaker that employs a Wavecor full range loudspeaker FR070WA04. Mikro Desktop has been developed by Bernd Timmermanns.

Mikro Desktop is a compact speaker with closed cabinet. Below 160 Hz it should be enhanced by a subwoofer.

The crossover consists of a LRC notch filter wired in series. Also in series a capacitor is employed. In parallel to the full range driver a RL circuit is arranged.

Between 50 Hz and 17 kHz, the frequency response of this loudspeaker is nearly flat on axis together with a subwoofer. The decay spectrum is nearly perfect below 17 kHz. At low volume, i.e. 80 dB at 1 m, the nonlinear distortions are below 0.1% above 600 Hz.

Below 160 Hz Mikro Desktop should be supported by a subwoofer.

Our kit consists of

  • Wavecor Fullrange FR070WA04, 8 Ohm
  • 0,5x Damping Sonofil 100 x 35 cm for 20 litres
  • Terminal T105 Au, with brass, gold plated
  • 1m Speaker cable 2x2.5 mm2, transparent
  • Pan screws 3.5x17 black, cross recess, 8 pieces
  • Plan for DIY kit

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

  • Mundorf, electrolytic capacitor, etched, 150 uF/63 Vdc
  • Mundorf, electrolytic capacitor, unetched, 10 uF / 70 Vdc
  • 0.7 mm air core coil, 0.33 mH/0.48 Ohm
  • 0.7 mm air core coil, 1.5 mH/1.13 Ohm
  • Metal-oxide resistor, 5W 0.33 Ohm 5% (orange-orange-silver)
  • Metal-oxide resistor, 5W 6.8 Ohm (blue-grey-gold)

Kit without cabinet, price per speaker   EUR 69,00 excl. VAT: € 57.98 / $ 67.26

Kit with high-end crossover

The high-end kit comes with two Audaphon MKP CAP superior capacitors. Two of the inductances are baked varnished coils 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 with high-end-crossover without cabinet, price per speaker   EUR 86,00 excl. VAT: € 72.27 / $ 83.83

Kit with high-end crossover No. 2

The high-end kit comes with two Audaphon MKP CAP superior capacitors. Two of the inductances are baked varnished coils 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 with high-end-crossover without cabinet, price per speaker   EUR 129,00 excl. VAT: € 108.40 / $ 125.75

universal PCBs

If you prefer to mount the crossover components on a 140 x 102 mm universal PCB instead on wood:
Universal PCB RA140, order no.. I-2765, price per unit:   EUR 3,70 excl. VAT: € 3.11 / $ 3.61
We recommend one board per kit (two boards for a speaker pair)


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