Big Block 3.0   Floorstanding as in Hobby Hifi 5/2020

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 80 dB
  • size (HxWxD): 1000 x 250 x 336 mm
  • frequency range (-8dB): 23 - 30000 Hz
  • crossover frequency(s): 180, 2000 Hz
  • speaker type: passive radiator

Big Block 3.0 is a three way floorstanding speaker with perfectly linear frequency response and exemplary waterfall diagram.

Big Block 3.0 is a loudspeaker with drivers of Audaphon and Wavecor. Passive radiators provide deep bass.

The kit is delivered with the following drivers:
- a Audaphon AMT 1i air motion transformer (ribbon-tweeter)
- a Wavecor WF182CU13 mids driver
- a Wavecor SW223BD02 woofer and
- a passive radiator PR223BD02

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 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 0,32% above 100 Hz.

Our kit consists of

  • Audaphon AMT-1i
  • WF182CU13, Wavecor Mid/Woofer, 8 Ohm, paper cone, BD, phase plug
  • 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)
  • 0,5x 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 Allen wood screws, black, 5x30 mm, 8 pieces
  • Allen wood screws, black, 4x25 mm, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 1.0 μF; / 400 Vdc
  • Audaphon MKP CAP Superior 3.3 μF; / 400 Vdc
  • Audaphon MKP CAP Superior 6.8 μF; / 400 Vdc
  • Electrolytic capacitor, etched 1000 μF; / 63V
  • JB, electrolytic capacitor, bipolar, 220 uF/50 Vdc
  • Mundorf, electrolytic capacitor, unetched, 100μF / 50 Vdc
  • Mundorf baked varnish air core coil BL71, 3.3 mH/1.75 Ohm
  • Mundorf baked varnish air core coil BL71, 18 mH/4,66 Ohm
  • Mundorf baked varnish air core coil BL100, 0.68 mH/0.39 Ohm
  • Mundorf baked varnish air core coil BL100, 0.82 mH/0.45 Ohm
  • Mundorf baked varnish air core coil BL100, 2.2 mH/0.83 Ohm
  • Mundorf bs125 core coil 6.8mH/0.37Ohm
  • Metal-oxide resistor, 10W 2.7 Ohm (red-purple-gold)
  • 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)

Kit without cabinet, price per speaker   EUR 1289,00 excl. VAT: € 1111.21 / $ 1311.22

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 Supreme EVO Öl 800V.

  • Mundorf MCAP EVO 220 μF; / 250 V
  • Mundorf MCAP EVO Oil 1 μF; / 450 V
  • Mundorf MCAP EVO Oil 6.8 μF; / 450 V
  • Mundorf MCAP EVO Oil 100 μF; / 350 V
  • Mundorf Mcap Supreme EVO Oil 3,3 μF; / 800V
  • Electrolytic capacitor, etched 1000 μF; / 63V
  • Mundorf copper foil coil CFC14-0.68mH/0.20Ohm
  • Mundorf copper foil coil CFC14-0.82mH/0.22Ohm
  • Mundorf copper foil coil CFC14-2.2mH/0.41Ohm
  • Mundorf baked varnish air core coil BL71, 3.3 mH/1.75 Ohm
  • Mundorf baked varnish air core coil BL71, 18 mH/4,66 Ohm
  • Mundorf bs180 core coil 6.8mH/0.21 Ohm
  • 2x MResist Supreme 3.3 Ohm / 20 Watt
  • MResist Supreme 8.2 Ohm / 20 Watt
  • MResist Supreme 10 Ohm / 20 Watt
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 1602,00 excl. VAT: € 1381.03 / $ 1629.62

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).

  • JB, electrolytic capacitor, bipolar advanced, 68μF / 50 Vdc
  • Mundorf baked varnish air core coil BL71, 0.033 mH
  • ceramic resistor 4.7 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 10,19 excl. VAT: € 8.78 / $ 10.37

universal PCB

For one speaker you need 1 pc. of RA140 and 1 pc. of RA240 pcb.

If you prefer to mount the crossover components on a 140 x 102 mm universal PCB instead on wood:
Universal PCB RA140, order no.. I-2765, price per unit:   EUR 3,61 excl. VAT: € 3.11 / $ 3.67
Universal PCB RA240, order no.. I-2767, price per unit:   EUR 7,41 excl. VAT: € 6.39 / $ 7.54
We recommend one board (each) per kit (two boards (each) for a speaker pair)


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