BPPR Three   Floorstanding as in K+T 3/2015

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 91 dB
  • size (HxWxD): 1210 x 240 x 350 mm
  • frequency range (-8dB): 40 - 30000 Hz
  • crossover frequency(s): 2800 Hz
  • speaker type: bass reflex

BPPR Three (standing for Best Price Performance Ratio) is a floorstander. It is developed by Dennis Frank and Daniel Gattig as a mixed system.

The upper woofer is in a closed volume the lower woofer in a bass reflex system. BPPR 3 contains a 30 mm Wavecor dome tweeter and two Wavecor woofers.

Its crossover consists of a low-pass and a high-pass branch each of second order, i.e. with a slope of 12 dB per octave. A resistor is in series to the tweeter as a voltage divider. To give a slight lifting to the highest treble, a capacitor is wired parallel to that resistor. No components are needed for eliminating any resonances or bulges in the frequency response.

We see a very even on-axis frequency response from 70 Hz to 30,000 Hz. The decay spectrum shows small resonances at 4000 Hz and below 500 Hz; apart from that it is nearly without fault. At 85 dB and 1 m, non-linear distortions remain below 0.3 % almost everywhere above 300 Hz.

Our kit consists of

  • Wavecor silk dome tweeter TW030WA01, 4 Ohm
  • 2x Wavecor Mid/Woofer WF168WA02, 8 Ohm
  • Bass reflex tube HP70, 70x220m, black
  • 3x Damping Sonofil 100 x 35 cm for 20 litres
  • Bi-wiring Terminal T122 Au with brass, gold plated
  • 3m Speaker cable 2x1.5 mm2, transparent
  • 0,5x Pan screws 3.5x17 black, torx, 8 pieces
  • 1,5x 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 3.3 μF / 400 Vdc
  • Audaphon MKP CAP Superior 6.8 μF / 400 Vdc
  • Audaphon MKT CAP 15 μF / 160 Vdc
  • 1.4 mm air core coil 1.2 mH/0.32 Ohm
  • 0.7 mm air core coil, 0.27 mH/0.44 Ohm
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)

Kit without cabinet,
price per speaker   EUR 436,00 excl. VAT: € 366.39 / $ 395.70

Kit with high-end crossover

The high-end kit comes with high-value Clarity Cap MKP foil capacitors, type ESA in series to the tweeter. 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 without cabinet,
price per speaker   EUR 468,00 excl. VAT: € 393.28 / $ 424.74

Impedance correction

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

universal PCBs

If you prefer to mount the crossover components on a 159 x 127 mm universal PCB instead on wood:
Universal PCB RA160, order no.. str-RA160, price per unit:   EUR 5,90 excl. VAT: € 4.96 / $ 5.35
We recommend one board per kit (two boards for a speaker pair)

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