WaveCenter SOTA   Shelf speaker as in Hobby Hifi 1/2025

Technical data
  • impedance: 6 Ohm
  • sensivity (2,83V/1m): 89 dB
  • size (HxWxD): 430 x 520 x 275 mm
  • frequency range (-8dB): 60 - 31000 Hz
  • crossover frequency(s): 330, 2800 Hz
  • speaker type: closed box

WaveCenter SOTA is a three way wall-mounted speaker.

WaveCenter SOTA is a closed-cabinet loudspeaker with drivers of Audaphon and Wavecor.

The kit is delivered with the following drivers:
- a Audaphon AMT-1i air motion transformer (ribbon-tweeter)
- two Wavecor MR120BD02 mids drivers
- two Wavecor WF182BD13 woofers

The loudspeaker has been developed by Bernd Timmermanns.

The crossover consists of:
- a 3rd order high-pass filter (18 dB per octave slope) for the tweeter.
- a band pass consisting of a 2nd order high pass filter (12 dB per octave slope) and a 3rd order low-pass filter (18 dB per octave slope) for the mids-woofer.
- a 2nd order low-pass filter (12 dB per octave slope) for the woofer.

The frequency response of this speaker is perfectly linear.

The decay spectrum is perfect.

At medium volume, i.e. 90 dB at 1 m, the nonlinear distortions are below 0,3% above 200 Hz.

An excerpt from the Hobby HiFi review

Conclusion of the magazine Hobby HiFi:

Our kit consists of

  • 2x Wavecor Mid/Woofer MR120BD02, 8 Ohm, die cast, kevlar/carbon cone
  • 2x Wavecor Mid/Woofer WF182BD13 kevlar/carbon, die cast, 4 Ohm
  • Audaphon AMT-1i
  • 4x Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • Binding Post PK31, gold plated (one pair, red and black)
  • 3m Speaker cable 2x2.5 mm2, transparent
  • 0,5x Visaton Countersunk screws 3.5x25, 8 pcs
  • 2,5x Allen wood screws, black, 4x25 mm, 8 pieces
  • Plan for DIY kit

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

  • ClarityCap PWA capacitor 4.7 μF / 400 Vdc
  • Audaphon MKP CAP Superior 3.9 μF / 400 Vdc
  • Audaphon MKP CAP Superior 8.2 μF / 400 Vdc
  • Audaphon MKT CAP 2.7 μF / 160 Vdc
  • Audaphon MKT CAP 8.2 μF / 160 Vdc
  • Audaphon MKT CAP 10 μF / 160 Vdc
  • 2x Mundorf, electrolytic capacitor, etched, 56 μF/100 Vdc
  • JB, electrolytic capacitor, bipolar, 470 μF/50 Vdc
  • 0.7 mm air core coil, 0.15 mH/0.28 Ohm
  • 0.7 mm air core coil, 0.33 mH/0.48 Ohm
  • 0.7 mm air core coil, 0.68 mH/0.70 Ohm
  • 0.7 mm air core coil, 1.5 mH/1.13 Ohm
  • 0.7 mm air core coil, 2.7 mH/1.53 Ohm
  • Mundorf ferrite core coil P71 12 mH/2.55Ohm
  • Mundorf H core coil H125, 6,8 mH/0,37 Ohm
  • Metal-oxide resistor, 10W 0.39 Ohm 5% (orange-white-silver)
  • Metal-oxide resistor, 10W 0.47 Ohm 5% (yellow-purple-silver)
  • Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)
  • Metal-oxide resistor, 10W 6.8 Ohm (blue-grey-gold)
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   EUR 1611,00 excl. VAT: € 1353.78 / $ 1570.39

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 Audaphon AMT-1i are of type polypropylen (MKP) Mundorf MCAP EVO Öl 450 V.

  • Mundorf MCAP EVO Oil 3.9 μF / 450 V
  • Mundorf MCAP EVO Oil 4.7 μF / 450 V
  • Mundorf MCAP EVO Oil 8.2 μF / 450 V
  • Mundorf MCAP EVO Oil 56 μF / 350 V
  • ClarityCap PWA capacitor 2.7 μF / 160 Vdc
  • ClarityCap PWA capacitor 10 μF / 250 Vdc
  • ClarityCap PWA capacitor 8.2 μF / 400 Vdc
  • Audaphon MKT CAP 10 μF / 160 Vdc
  • Audaphon MKT CAP 47 μF / 160 Vdc
  • JB, electrolytic capacitor, bipolar, 470 μF/50 Vdc
  • Mundorf baked varnish air core coil BL71, 0.15 mH/0.28 Ohm
  • Mundorf baked varnish air core coil BL71, 0.33 mH/0.48 Ohm
  • Mundorf baked varnish air core coil BL71, 0.68 mH/0.71 Ohm
  • Mundorf baked varnish air core coil BL71, 1.5 mH/1.13 Ohm
  • Mundorf baked varnish air core coil BL71, 2.7 mH/1.53 Ohm
  • Mundorf baked varnish ferrite core coil BP71 12 mH/2.55Ohm
  • Mundorf vs180 core coil 6.8 mH/0.21 Ohm
  • Mresist ultra 4,7 Ohm, 3/30Watt
  • Mresist Ultra cooling rod 6,5K/W + Accessories (Set 1)
  • Metal-oxide resistor, 10W 0.39 Ohm 5% (orange-white-silver)
  • Metal-oxide resistor, 10W 0.47 Ohm 5% (yellow-purple-silver)
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)
  • Metal-oxide resistor, 10W 6.8 Ohm (blue-grey-gold)
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 1836,00 excl. VAT: € 1542.86 / $ 1789.71

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).

  • Audaphon MKT CAP 8.2 μF / 160 Vdc
  • 0.7 mm air core coil, 0.10 mH/0.27 Ohm
  • ceramic resistor 10 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 8,60 excl. VAT: € 7.23 / $ 8.38

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.. str-RA240, price per unit:   EUR 8,60 excl. VAT: € 7.23 / $ 8.38
We recommend one board per kit (two boards for a speaker pair)


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