Big Block 2.0   Floorstanding as in Hobby Hifi 2/2019

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 80 dB
  • size (HxWxD): 1000 x 250 x 336 mm
  • frequency range (-8dB): 16 - 28000 Hz
  • crossover frequency(s): 2200 Hz
  • speaker type: passive radiator

Big Block 2.0 is a two way floorstanding speaker.

Big Block 2.0 is a loudspeaker with drivers of Audaphon and Wavecor. Passive radiators bring out a deep bass.

The kit is delivered with the following drivers:
- a Audaphon AMT 1i air motion transformer (ribbon-tweeter)
- a Wavecor SW223BD02 woofer

The loudspeaker has been developed by Bernd Timmermanns.

The crossover consists of:
- a 2nd order high-pass filter (12 dB per octave slope) for the tweeter.
- 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 as shown in the waterfall diagram is exemplary, free of any disturbing resonance.

At medium volume, i.e. 90 dB at 1 m, the nonlinear distortions are below 1% above 400 Hz.

An excerpt from the Hobby HiFi review

Conclusion of the magazine Hobby HiFi:

Our kit consists of

  • Audaphon AMT-1i
  • Wavecor Subwoofer SW223BD02, die cast, 4 Ohm
  • Wavecor PR223BD02 Passive Radiator, die cast
  • 2x Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK28 I, gold plated (one pair, red and black)
  • 3m Speaker cable 2x2.5 mm2, transparent
  • 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.

  • ClarityCap CSA capacitor 3.3 uF / 630 Vdc
  • Audaphon MKP CAP Superior 1.0 uF / 400 Vdc
  • Audaphon MKP CAP Superior 4.7 uF / 400 Vdc
  • Audaphon MKP CAP Superior 15 uF / 400 Vdc
  • electrolytic capacitor, unetched, 22uF / 70 Vdc
  • Mundorf baked varnish air core coil BL71, 0.68 mH/0.71 Ohm
  • Mundorf baked varnish air core coil BL71, 3.9 mH/2.04 Ohm
  • Mundorf baked varnish air core coil BL100, 0.82 mH/0.45 Ohm
  • Mundorf baked varnish air core coil BL140, 1.2 mH/0.34 Ohm
  • 2x Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)
  • Metal-oxide resistor, 10W 10 Ohm (brown-black-black)
  • Metal-oxide resistor, 5W 0.56 Ohm 5% (green-blue-silver)

Kit without cabinet, price per speaker   EUR 1034,00 excl. VAT: € 868.91 / $ 964.49

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) Clarity-Cap CMR 630 V.

Kit with high-end-crossover without cabinet, price per speaker   EUR 1193,00 excl. VAT: € 1002.52 / $ 1112.80

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 9,04 excl. VAT: € 7.60 / $ 8.43

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 / $ 7.09
We recommend one board per kit (two boards for a speaker pair)


Home   Hobby HiFi Overview