Power-Duo   Floorstanding as in Hobby Hifi 1/2019

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 84 dB
  • size (HxWxD): 800 x 440 x 278 mm
  • frequency range (-8dB): 35 - 21000 Hz
  • crossover frequency(s): 600 Hz
  • speaker type: dipol

Power-Duo is a two way floorstanding speaker.

Power-Duo is a dipole cabinet loudspeaker with drivers of Tang band and Omnes Audio.

The kit is delivered with the following drivers:
- a Tang Band W5-2143 full range driver
- a Omnes Audio OBW15PA woofer

The loudspeaker has been developed by Bernd Timmermanns and Blue Planet Acoustic.

The crossover consists of:
- a 3rd order high-pass filter (18 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 linear.

The decay spectrum is nearly perfect.

At medium volume, i.e. 90 dB at 1 m, the nonlinear distortions are below 0,5% above 200 Hz.

Our kit consists of

  • Omnes Audio OBW15PA
  • Tang Band W5-2143
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x2.5 mm2, transparent
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 4.7 uF / 400 Vdc
  • 2x Audaphon MKP CAP Superior 15 uF / 400 Vdc
  • Mundorf, electrolytic capacitor, unetched, 47uF / 50 Vdc
  • Mundorf baked varnish air core coil BL100, 0.022 mH/0.07 Ohm
  • Mundorf bs100 core coil 3.3mH/0.36Ohm
  • Mundorf bs140 core coil 15mH/0.48Ohm
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)
  • Metal-oxide resistor, 10W 15 Ohm (brown-green-black)
  • Metal-oxide resistor, 5W 22 Ohm (red-red-black)

Kit without cabinet, price per speaker   EUR 322,00 excl. VAT: € 270.59 / $ 303.06

Kit with high-end crossover

The high-end kit is delivered with baked varnish air core coil 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 fullrange driver are of type polypropylen (MKP) Mundorf EVO Oil 450 V.

Kit with high-end-crossover without cabinet, price per speaker   EUR 396,00 excl. VAT: € 332.77 / $ 372.71

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 37,25 excl. VAT: € 31.30 / $ 35.06

universal PCB

If you prefer to mount the crossover components on a 240 x 165 mm universal PCB instead on wood:
Universal PCB RA240, order no.. I-2767, price per unit:   EUR 7,60 excl. VAT: € 6.39 / $ 7.15
We recommend one board per kit (two boards for a speaker pair)


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