Micro Block MK2   Shelf speaker as in Hobby Hifi 1/2017

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 80 dB
  • size (HxWxD): 350 x 150 x 325 mm
  • frequency range (-8dB): 38 - 35000 Hz
  • crossover frequency(s): 1300 Hz
  • speaker type: bass reflex

The Micro Block MK2 is an impoved version of Micro Block 02/2015. Micro Block MK2 is a compact loudspeaker with extremely well-behaved sound dispersion and other very good sonic properties at a low price. The Micro Block MK2 is home to a Wavecor dome, the TW030WA12, and the subwoofer SW118WA02.

Micro Block MK2 has been developed by Bernd Timmermanns.

We warmly recommend this loudspeaker.

Its crossover consists of a 3rd order high-pass for the tweeter. A resistor as voltage divider in series to the tweeter got a capacitor in parallel to lift the highest frequencies. The woofer is connected to a 2nd order low pass filter. An RCL curcuit in parallel to the woofer is smoothing the frequency response between 80 Hz an 400 Hz.

The frequency response is absolutely flat on axis between 50 Hz and 30,000 Hz. The decay spectrum (waterfall diagram over frequency) is exemplary, free of any disturbing resonances. At 90 dB and 1 m, non-linear distortions remain below 0.35 % almost everywhere above 500 Hz.

Our kit consists of

  • Wavecor silk dome tweeter TW030WA12, 8 Ohm
  • Wavecor Subwoofer SW118WA02, 8 Ohm
  • Bass reflex tube HP50, 50x145 mm, black
  • Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • Binding Post PK31, gold plated (one pair, red and black)
  • 1,5m Speaker cable 2x2.5 mm2, transparent
  • Pan screws 4x20 black, cross recess, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 1.0 μF / 400 Vdc
  • Audaphon MKP CAP Superior 4.7 μF / 400 Vdc
  • Audaphon MKP CAP Superior 10 μF / 400 Vdc
  • electrolytic capacitor, etched, 220 μF/63 Vdc
  • electrolytic capacitor, unetched, 33uF / 70 Vdc
  • Mundorf air core coil L140, 2.2 mH/0.46 Ohm
  • 0.7 mm air core coil, 1.2 mH/1.08 Ohm
  • 0.7 mm air core coil, 15 mH/4,45 Ohm
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)
  • Metal-oxide resistor, 5W 1.0 Ohm (brown-black-gold)
  • Metal-oxide resistor, 5W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 5W 6.8 Ohm (blue-grey-gold)

Hint: In addition two DN50, 87 degree are needed

Kit without cabinet, price per speaker   EUR 370,00 excl. VAT: € 310.92 / $ 332.69

Kit with high-end crossover

The high-end kit contains three Mundorf MCAP EVO silver gold oil capacitors. The coil for the woofer is a Mundorf copper foil coil CFC 14. The other coils are baked varnish coils for diminishing the microphonics effect. Current flowing through the coil creates a magnetic field which on itself sets the reel of wire in motion. That motion induces a voltage in the coil which adds itself to the original signal.

Kit with high-end-crossover without cabinet, price per speaker   EUR 631,00 excl. VAT: € 530.25 / $ 567.37

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.

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 15,70 excl. VAT: € 13.19 / $ 14.12

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 / $ 3.78
We recommend two boards per kit (four boards for a speaker pair)

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