Mikro HiFi PA   Shelf speaker as in Hobby Hifi 1/2022

Technical data
  • impedance: 6 Ohm
  • sensivity (2,83V/1m): 84 dB
  • size (HxWxD): 300 x 158 x 238 mm
  • frequency range (-8dB): 45 - 18000 Hz
  • crossover frequency(s): 4000 Hz
  • speaker type: bass reflex

Mikro HiFi PA is a two way compact speaker.

Mikro HiFi PA is a bass-reflex cabinet loudspeaker with drivers of Monacor .

The kit is delivered with the following drivers:
- a Monacor MPT-165 horn with driver
- a Monacor SP-60/4 woofer

The loudspeaker has been developed by Bernd Timmermanns.

The crossover consists of:
- a 2nd order high-pass filter (12 dB per octave slope) for the tweeter.
- 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 is nearly perfect.

At medium volume, i.e. 90 dB at 1 m, the nonlinear distortions are below 1,2% above 300 Hz.

Our kit consists of

  • Monacor SP-60/4
  • Monacor MPT-165 piezo tweeter
  • Bass reflex tube HP35, 35x123mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,Damping Sonofil 100 x 35 cm for 20 litres
  • 0,5x Audaphon Damping 10, 970 x 470 mm, adhesive
  • Binding Post PK31, gold plated (one pair, red and black)
  • 1m Speaker cable 2x0.75 mm2, transparent
  • Pan screws 4x20 black, torx, 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 MKT CAP 6.8 μF / 160 Vdc
  • JB, electrolytic capacitor, bipolar, 47 μF/100 Vdc
  • 0.7 mm air core coil, 0.56 mH/0.55 Ohm
  • Mundorf ferrite core coil P71 0.68 mH/0.36Ohm
  • Mundorf ferrite core coil P71 0.82 mH/0.41Ohm
  • Metal-oxide resistor, 5W 4.7 Ohm (yellow-violet-gold)
  • Metal-oxide resistor, 5W 10 Ohm (brown-black-black)
  • Metal-oxide resistor, 5W 27 Ohm (red-purple-black)

Kit without cabinet, price per speaker   EUR 97,50 excl. VAT: € 81.93 / $ 81.93

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 Monacor MPT-165 are of type polypropylen (MKP) Audaphon MKP CAP Superior / 400V.

  • Audaphon MKP CAP Superior 1.0 μF / 400 Vdc
  • Audaphon MKP CAP Superior 6.8 μF / 400 Vdc
  • JB, electrolytic capacitor, bipolar, 47 μF/100 Vdc
  • Mundorf baked varnish air core coil BL71, 0.56 mH/0.64 Ohm
  • Mundorf baked varnish ferrite core coil, BP71, 0.68 mH/0.36 Ohm
  • Mundorf baked varnish ferrite core coil, BP71, 0.82 mH/0.41 Ohm
  • Metal-oxide resistor, 5W 4.7 Ohm (yellow-violet-gold)
  • Metal-oxide resistor, 5W 10 Ohm (brown-black-black)
  • Metal-oxide resistor, 5W 27 Ohm (red-purple-black)

Kit with high-end-crossover without cabinet, price per speaker   EUR 107,00 excl. VAT: € 89.92 / $ 89.92

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, 22μF / 50 Vdc
  • ceramic resistor 6.8 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 4,30 excl. VAT: € 3.61 / $ 3.61

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 / $ 3.53
We recommend one board per kit (two boards for a speaker pair)


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