Small Block, Shelf speaker   as in Hobby Hifi 4/2014

Technical data
- impedance: 8 Ohm
- sensivity (2,83V/1m): 78 dB
- size (HxWxD): 540 x 210 x 330 mm
- frequency range (-8dB): 22 - 30000 Hz
- crossover frequency(s): 1900 Hz
- speaker type: passive radiator

Bernd Timmermanns of journal Hobby HiFi presents Small Block, which exists in two different cabinets:

  • in a designer cabinet delivered by Peak LSV
  • as shelf speaker (cabinet ends below the woofer)
.

The speaker contains an air motion transformer Audaphon AMT-1i, a woofer Wavecor SW182BD02 and a Wavecor passive membrane (passive radiator) Wavecor PR182BD01.

The crossover consists of second-order filters.

The frequency response of the speaker-system is nearly flat. The decay spectrum is well. The most noteworthy fact is that the non-linear distortions remain almost consistently below 0.3% at 90 dB SPL (1m) above 250 Hz and mostly below 0,1% above 1500 Hz.
 

Our kit consists of

  
  • air motion transformer Audaphon AMT-1i
  • subwoofer Wavecor SW182BD02, die cast
  • passive radiator Wavecor PR182BD01, die cast
  • 0,5x Damping Sonofil 100 x 35 cm for 20 litres
  • 0,5x Audaphon Damping 10, 970 x 470 mm, adhesive
  • Binding Post PK31, gold plated (one pair, red and black)
  • 3m Speaker cable 2x2.5 mm2, transparent
  • Allen wood screws, black, 4x25 mm, 12 pieces
  • Pan screws, black, 4 pieces
  • Plan for DIY kit

the crossover components (right),
to be mounted on a piece of wood

  • Mundorf MCAP EVO Oil 5.6 uF / 450 V
  • 2x Audaphon MKP CAP Superior 1.5 uF / 400 Vdc
  • Audaphon MKP CAP Superior 8.2 uF / 400 Vdc
  • Mundorf, electrolytic capacitor, unetched, 33uF / 70 Vdc
  • Mundorf baked varnish air core coil BL71, 0.68 mH/0.71 Ohm
  • Mundorf baked varnish air core coil BL71, 1.0 mH/1.02 Ohm
  • Mundorf baked varnish air core coil BL140, 1.2 mH/0.34 Ohm
  • MOX5-resistor 1.0 Ohm/5 Watt (brown-black-gold)
  • MOX5-resistor 1.5 Ohm/5 Watt (brown-green-gold)
  • MOX5-resistor 8.2 Ohm/5 Watt (grey-red-gold)
  • Metal-oxide resistor, 10W 10 Ohm 2% (brown-black-black)

Kit without cabinet, price per speaker EUR 719,00 excl. VAT: € 604.20 / $ 539.47

Kit with high-end crossover

The kit with high-end crossover contains Mundorf copper foil coils in series to the woofer an parallel to the air motion transformer. In series to the air motion transformer a Mundorf capacitors of high quality is used: a silver/gold/oil MCAP capacitor.

  • Mundorf MCAP EVO Silver Gold Öl 5.6 uF / 450 V
  • Mundorf MCAP EVO Oil 8.2 uF / 450 V
  • 2x Mundorf MCAP EVO Oil 1.5 uF / 450 V
  • Mundorf MKP capacitor 33 uF / 250 V
  • Mundorf baked varnish air core coil BL71, 0.68 mH/0.71 Ohm
  • Mundorf copper foil coil CFC16-1.0mH/0.33Ohm
  • Mundorf copper foil coil CFC14-1.2mH/0.26Ohm
  • MOX5-resistor 1.0 Ohm/5 Watt (brown-black-gold)
  • MOX5-resistor 1.5 Ohm/5 Watt (brown-green-gold)
  • MOX5-resistor 8.2 Ohm/5 Watt (grey-red-gold)
  • Metal-oxide resistor, 10W 10 Ohm 2% (brown-black-black)

Kit with high-end-crossover without cabinet, price per speaker EUR 839,00 excl. VAT: € 705.04 / $ 629.50

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 MKP CAP Superior 4.7 uF / 400 Vdc
  • Mundorf baked varnish air core coil BL71, 1.5 mH/0.96 Ohm
  • 3x MOX10 resistor 56 Ohm/10 Watt (green-blue-black)


Price per impedance correction for one speaker, to be mounted on a small wooden board.   EUR 16,80 excl. VAT: € 14.12 / $ 12.61

universal PCB

If you prefer to mount the crossover components on a 159 x 127 mm universal PCB instead on wood:
Universal PCB RA160, order no.. I-2766, price per unit: EUR 5,10 excl. VAT: € 4.29 / $ 3.83
We recommend one board per kit (two boards for a speaker pair)
 


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