Wavemon 120/30   Shelf speaker as in Hobby Hifi 2/2016

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 83 dB
  • size (HxWxD): 350 x 150 x 280 mm
  • frequency range (-8dB): 32 - 33000 Hz
  • crossover frequency(s): 2100 Hz
  • speaker type: bass reflex

Wavemon 120/30 is a 2 way compakt monitor speaker with for the size very deep bassrange. Wavemon 120/30 has been developed by Bernd Timmermanns.

In Wavemon 120/30 is used a Wavecor WF120BD05 for the bass range and a Wavecor TW030WA13 for the tweeter.

The crossover consists of a 2nd order high-pass filter (12 dB per octave slope) for the tweeter. The woofer is connected to a 3rd order low-pass filter (18 dB per octave slope) with two parallel RCL.

Between 40 Hz and 30 kHz, the frequency response of this loudspeaker is nearly flat on axis. The decay spectrum is nearly perfect. At low volume, i.e. 90 dB at 1 m, the nonlinear distortions are below 1% above 200 Hz.

Our kit consists of

  • Wavecor silk dome tweeter TW030WA13, 4 Ohm
  • Wavecor Mid/Woofer WF120BD05 glass fiber, die cast, 4 Ohm
  • Bass reflex tube HP35, 35x125 mm, black
  • Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 0,5x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x2.5 mm2, transparent
  • 0,5x Pan screws 3.5x17 black, cross recess, 8 pieces
  • 0,5x Pan screws 4x20 black, cross recess, 8 pieces
  • Plan for DIY kit

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

  • Mundorf MCAP EVO 0.47 uF / 450 V
  • Mundorf MCAP EVO 1.8 uF / 450 V
  • Mundorf MCAP EVO 3.3 uF / 450 V
  • Mundorf, electrolytic capacitor, etched, 330 uF/63 Vdc
  • Mundorf, electrolytic capacitor, unetched, 15uF / 70 Vdc
  • Mundorf, electrolytic capacitor, unetched, 22uF / 70 Vdc
  • Mundorf air core coil L50, 1.5 mH/1.85 0hm
  • Mundorf air core coil L140, 0.33 mH/0.15 Ohm
  • Mundorf air core coil L140, 1.0 mH/0.30 Ohm
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • 0.7 mm air core coil, 10 mH/3.85 Ohm
  • Metal-oxide resistor, 10W 6.8 Ohm (blue-grey-gold)
  • Metal-oxide resistor, 5W 1.5 Ohm (brown-green-gold)
  • Metal-oxide resistor, 5W 6.8 Ohm (blue-grey-gold)
  • Metal-oxide resistor, 5W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   EUR 265,00 excl. VAT: € 222.69 / $ 258.32

Kit with high-end crossover

The high-end kit comes with three Mundorf MCAP EVO Oil capacitors. Instead of two electrolytic capacitors unetched two polyester capacitors (MKP) of high quality are employed. The inductances are Mundorf copper foil capacitors or 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 341,00 excl. VAT: € 286.55 / $ 332.40

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 14,05 excl. VAT: € 11.81 / $ 13.70

universal PCBs

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 / $ 7.41
We recommend one board per kit (two boards for a speaker pair)


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