Harwood-Reference, Floorstanding   as in Hobby Hifi 2/2014

Technical data
- impedance: 4 Ohm
- sensivity (2,83V/1m): 85 dB
- size (HxWxD): 1138 x 220 x 500 mm
- frequency range (-8dB): 22 - 40000 Hz
- crossover frequency(s): 150, 3000 Hz
- speaker type: bass reflex

Harwood reference is a speaker system developed by Bernd Timmermanns. Harwood Reference can be built with a simple rectangular enclosure or a slightly oblique built housing by Michael Karwowski.

The speaker contains a Harwood Ribbon, which is in the middle of two Harwood woofers. A great peerless subwoofer takes over the low frequencies.
 

   

Our kit consists of

  • Harwood air motion transformer AM 25.2
  • 2x Harwood midwoofer TM 130/25F1
  • Peerless woofer XXLS AL 10-04 (835016)
  • PE sealing tape, 5x2 mm
  • Damping Sonofil 100 x 35 cm for 20 litres
  • 5x Bitumex board 32.5 x 24.5 cm, 6 mm
  • 1,5x Cutting of needle fleece 1100 g/m2 1000x400, 10mm
  • Binding Post PK31, gold plated (one pair, red and black)
  • 5m Speaker cable 2x2.5 mm2, transparent
  • Allen wood screws, black, 5x30 mm, 8 pieces
  • Allen wood screws, black, 4X25MM, 12 pieces
  • Plan for DIY kit

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

  • ClarityCap PWA capacitor 68 μF / 160 Vdc
  • ClarityCap PWA capacitor 82 μF / 160 Vdc
  • Audaphon MKP CAP Superior 12 μF / 400 Vdc
  • Mundorf MCAP EVO 0.47 μF / 450 V
  • Mundorf MCAP EVO Oil 4.7 μF / 450 V
  • electrolytic capacitor, etched, 82 μF/100 Vdc
  • electrolytic capacitor, etched, 270 μF/63 Vdc
  • electrolytic capacitor, etched, 330 μF/63 Vdc
  • electrolytic capacitor, etched, 680 μF/63 Vdc
  • Mundorf baked varnish air core coil BL71, 0.22 mH/0.34 Ohm
  • Mundorf baked varnish air core coil BL71, 0.56 mH/0.64 Ohm
  • Mundorf baked varnish air core coil BL71, 3.3 mH/1.75 Ohm
  • Mundorf baked varnish air core coil BL71, 10 mH/3.62 Ohm
  • Mundorf baked varnish air core coil BL71, 15 mH/4.45 Ohm
  • Mundorf baked varnish air core coil BL140, 1.0 mH/0.30 Ohm
  • Mundorf bs125 core coil 5.6mH/0.33Ohm
  • Metal-oxide resistor, 5W 8.2 Ohm (grey-red-gold)
  • Metal-oxide resistor, 10W 0.47 Ohm 5% (yellow-purple-silver)
  • Metal-oxide resistor, 10W 1.0 Ohm (brown-black-gold)
  • Metal-oxide resistor, 10W 1.5 Ohm (brown-green-gold)
  • 2x Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 3.9 Ohm (orange-white-gold)
  • Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)

Kit without cabinet, price per speaker - not available

Kit with high-end crossover

The kit with high-end crossover contains four Mundorf copper foil coils and in series to the loudspeakers Mundorf capacitors of high quality, like a silver/gold/oil capacitor in series to the tweeter.

  • Mundorf MCAP EVO 12 μF / 450 V
  • Mundorf MCAP EVO 150 μF / 250 V
  • Mundorf MCAP EVO Oil 0.47 μF / 450 V
  • Mundorf MCAP EVO Silver Gold Oil 4.7 μF / 450 V
  • electrolytic capacitor, etched, 220 μF/63 Vdc (C1)
  • electrolytic capacitor, unetched, 100uF / 50 Vdc (in parallel C1)
  • electrolytic capacitor, unetched, 10 μF / 70 Vdc (in parallel C1)
  • electrolytic capacitor, etched, 270 μF/63 Vdc
  • electrolytic capacitor, etched, 680 μF/63 Vdc
  • electrolytic capacitor, unetched, 82uF / 50 Vdc
  • Mundorf baked varnish air core coil BL71, 3.3 mH/1.75 Ohm
  • Mundorf baked varnish air core coil BL71, 10 mH/3.62 Ohm
  • Mundorf baked varnish air core coil BL71, 15 mH/4.45 Ohm
  • Mundorf copper foil coil CFC14-0.22mH/0.09Ohm
  • Mundorf copper foil coil CFC14-0.56mH/0.16Ohm
  • Mundorf copper foil coil CFC14-1.0mH/0.23Ohm
  • Mundorf CFS14 coil, 5.6 mH/0.26 Ohm
  • Metal-oxide resistor, 5W 8.2 Ohm (grey-red-gold)
  • Metal-oxide resistor, 10W 0.47 Ohm 5% (yellow-purple-silver)
  • Metal-oxide resistor, 10W 1.0 Ohm (brown-black-gold)
  • Metal-oxide resistor, 10W 1.5 Ohm (brown-green-gold)
  • 2x Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 3.9 Ohm (orange-white-gold)
  • Metal-oxide resistor, 10W 4.7 Ohm (yellow-violet-gold)

Kit with high-end-crossover without cabinet, price per speaker - not available

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 47 μF / 160 Vdc
  • 4x Metal-oxide resistor, 10W 22 Ohm (red-red-black)


Price per impedance correction for one speaker, to be mounted on a small wooden board.   EUR 18,20 excl. VAT: € 15.29 / $ 16.67

universal 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.. str-RA140, price per unit: EUR 4,20 excl. VAT: € 3.53 / $ 3.85
We recommend two boards per speaker set for the tweeter crossover

If you prefer to mount the crossover components on a 159 x 127 mm universal PCB instead on wood:
Universal PCB RA160, order no.. str-RA160, price per unit: EUR 5,90 excl. VAT: € 4.96 / $ 5.40
We recommend two boards per speaker set for the woofer crossover

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 / $ 7.88
We recommend two boards per speaker set for the mids crossover
 


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