Bamboo 3   Shelf speaker as in Hobby HiFi 5/2015

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 82 dB
  • size (HxWxD): 300 x 300 x 120 mm
  • frequency range (-8dB): 100 - 30000 Hz
  • crossover frequency(s): Hz
  • speaker type: closed box

Bamboo 3 is a small wall-mounted loudspeaker that employs a Tang Band fullrange loudspeaker W3-871B. Bamboo 3 has been developed by Marko Krause and Bernd Timmermanns.

The crossover consists of a LRC notch filter wired in series. The wave trap reduces the level between 2 and 4 kHz. In addition as series capacitor to protect the loudspeaker from too much bass. In parallel to the full range driver an absorption circuit is arranged.

Below 200 Hz Bamboo 3 should be supported by a subwoofer.

Our kit consists of

  • Tang Band W3-871 A, 9 cm full range
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,5x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 1m Speaker cable 2x2.5 mm2, transparent
  • 0,5x 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.
  • electrolytic capacitor, etched, 15 μF/100 Vdc
  • electrolytic capacitor, etched, 82 μF/100 Vdc
  • electrolytic capacitor, unetched, 4.7 μF / 70 Vdc
  • Mundorf air core coil L50, 1.8 mH/2.07 0hm
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • 0.7 mm air core coil, 2.7 mH/1.53 Ohm
  • Metal-oxide resistor, 3W 1.5 Ohm (brown-green-gold)
  • Metal-oxide resistor, 5W 6.8 Ohm (blue-grey-gold)

Kit without cabinet, price per speaker   EUR 85,60 excl. VAT: € 71.93 / $ 76.97

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 110,00 excl. VAT: € 92.44 / $ 98.91

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 5,50 excl. VAT: € 4.62 / $ 4.95

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.. str-RA140, price per unit:   EUR 4,20 excl. VAT: € 3.53 / $ 3.78
We recommend one board per kit (two boards for a speaker pair)



Wooden bowl for Kit Bamboo 3,
price per unit   EUR 17,70 excl. VAT: € 14.87 / $ 15.92

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