Little Roy   Subwoofer as in Hobby Hifi 3/2015

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 87 dB
  • size (HxWxD): 450 x 250 x 370 mm
  • frequency range (-8dB): 33 - 200 Hz
  • crossover frequency(s): Hz
  • speaker type: passive radiator

Little-Roy is a compact high-end subwoofer. Bernd Timmermanns has developed this woofer. The Little Roy is home to two Wavecor woofers SW178WA01 and two Wavecor passive radiators.

We warmly recommend this loudspeaker.

Our kit with amplifier module consists of

  • 2x Wavecor Subwoofer SW178WA01, 8 Ohm
  • 2x Wavecor PR178WA01 Passive Radiator
  • Mivoc subwoofer module AM 80 MK II, 80W
  • 2m Speaker cable 2x2.5 mm2, transparent
  • Pan screws 4x20 black, cross recess, 16 pieces
  • Plan for DIY kit
Hint: For the amplifier AM 80 MK II a separate cabinet is necessary or the subwoofer cabinet has to be modified.

Kit without cabinet, price per speaker   EUR 593,00 excl. VAT: € 498.32 / $ 523.24

Our kit with separate amplifier Reckhorn A-408 consists of

  • 2x Wavecor Subwoofer SW178WA01, 8 Ohm
  • 2x Wavecor PR178WA01 Passive Radiator
  • Reckhorn Subwoofer Amplifier A-408
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x2.5 mm2, transparent
  • Pan screws 4x20 black, cross recess, 16 pieces
  • Plan for DIY kit

Kit without cabinet, price per speaker   EUR 799,00 excl. VAT: € 671.43 / $ 705.00

Damping 10

If you choose a cut-off frequency above 80 Hz, we recommend additional damping of two or three sheets of damping 10, 970 x 470 mm, adhesive

  EUR 19,34 excl. VAT: € 16.25 / $ 17.06

very deep bass

If you want to get a very deep reaching bass, additional weights for the passive radiator are recommended. In this case you should buy washers with outer diameter of about 40 mm with a 6.5 mm hole.

Kits with passive filter

Kit with passive filter with a cut-off frequency of 100 Hz

  • 2x Wavecor Subwoofer SW178WA01, 8 Ohm
  • 2x Wavecor PR178WA01 Passive Radiator
  • 2,5x Audaphon Damping 10, 970 x 470 mm, adhesive
  • 2x Binding Post PK28 I, gold plated (one pair, red and black)
  • 3m Speaker cable 2x2.5 mm2, transparent
  • Pan screws 4x20 black, cross recess, 16 pieces
  • Plan for DIY kit

the crossover components (right),
to be mounted on a small wooden board.
  • 2x electrolytic capacitor, etched, 150 μF/63 Vdc
  • 2x electrolytic capacitor, etched, 220 μF/63 Vdc
  • 2x electrolytic capacitor, unetched, 33uF / 70 Vdc
  • 2x Mundorf air core coil L71, 27 mH/6.44 Ohm
  • 2x Mundorf bs125 core coil 22mH/0.75Ohm
  • 2x Metal-oxide resistor, 10W 1.8 Ohm (brown-grey-gold)
  • 2x Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   - not available

Kit with passive high-end crossover with a cut-off frequency of 100 Hz

  • 2x electrolytic capacitor, etched, 220 μF/63 Vdc
  • 2x electrolytic capacitor, unetched, 33uF / 70 Vdc
  • 2x electrolytic capacitor, unetched, 150 μF / 50 Vdc
    ... ( 68 μF and 82 μF in parallel)
  • 2x Mundorf baked varnish air core coil BL71, 27 mH/6.44 Ohm
  • 2x Mundorf bs140 core coil 22mH/0.56Ohm
  • 2x Metal-oxide resistor, 10W 1.8 Ohm (brown-grey-gold)
  • 2x Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   - not available

Kit with passive filter with a cut-off frequency of 120 Hz

  • 2x Wavecor Subwoofer SW178WA01, 8 Ohm
  • 2x Wavecor PR178WA01 Passive Radiator
  • 2,5x Audaphon Damping 10, 970 x 470 mm, adhesive
  • 2x Binding Post PK28 I, gold plated (one pair, red and black)
  • 3m Speaker cable 2x2.5 mm2, transparent
  • Pan screws 4x20 black, cross recess, 16 pieces
  • Plan for DIY kit

the crossover components (right),
to be mounted on a small wooden board.
  • 2x electrolytic capacitor, etched, 122 μF/100 Vdc
    ... (100 μF and 22 μF in parallel)
  • 2x electrolytic capacitor, etched, 100 μF/100 Vdc
  • 2x electrolytic capacitor, etched, 220 μF/63 Vdc
  • 2x electrolytic capacitor, unetched, 33uF / 70 Vdc
  • 2x Mundorf air core coil L71, 27 mH/6.44 Ohm
  • 2x Mundorf bs125 core coil 18mH/0.66Ohm
  • 2x Metal-oxide resistor, 10W 1.8 Ohm (brown-grey-gold)
  • 2x Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   - not available

Kit with passive high-end crossover with a cut-off frequency of 120 Hz

  • 2x electrolytic capacitor, unetched, 122uF / 50 Vdc
    ... (100 μF and 22 μF in parallel)
  • 2x electrolytic capacitor, etched, 220 μF/63 Vdc
  • 2x electrolytic capacitor, unetched, 33uF / 70 Vdc
  • 2x Mundorf baked varnish air core coil BL71, 27 mH/6.44 Ohm
  • 2x Mundorf bs140 core coil 18mH/0.54Ohm
  • 2x Metal-oxide resistor, 10W 1.8 Ohm (brown-grey-gold)
  • 2x Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   - not available

Kit with passive filter with a cut-off frequency of 140 Hz

  • 2x Wavecor Subwoofer SW178WA01, 8 Ohm
  • 2x Wavecor PR178WA01 Passive Radiator
  • 2,5x Audaphon Damping 10, 970 x 470 mm, adhesive
  • 2x Binding Post PK28 I, gold plated (one pair, red and black)
  • 3m Speaker cable 2x2.5 mm2, transparent
  • Pan screws 4x20 black, cross recess, 16 pieces
  • Plan for DIY kit

the crossover components (right),
to be mounted on a small wooden board.
  • 2x electrolytic capacitor, etched, 100 μF/100 Vdc
  • 2x electrolytic capacitor, etched, 220 μF/63 Vdc
  • 2x electrolytic capacitor, unetched, 33uF / 70 Vdc
  • 2x Mundorf air core coil L71, 27 mH/6.44 Ohm
  • 2x Mundorf bs125 core coil 15mH/0.59Ohm
  • 2x Metal-oxide resistor, 10W 1.8 Ohm (brown-grey-gold)
  • 2x Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   - not available

Kit with passive high-end crossover with a cut-off frequency of 140 Hz

  • 2x electrolytic capacitor, unetched, 100uF / 50 Vdc
  • 2x electrolytic capacitor, etched, 220 μF/63 Vdc
  • 2x electrolytic capacitor, unetched, 33uF / 70 Vdc
  • 2x Mundorf baked varnish air core coil BL71, 27 mH/6.44 Ohm
  • 2x Mundorf bs140 core coil 15mH/0.48Ohm
  • 2x Metal-oxide resistor, 10W 1.8 Ohm (brown-grey-gold)
  • 2x Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   - not available

Kit with passive filter with a cut-off frequency of 170 Hz

  • 2x Wavecor Subwoofer SW178WA01, 8 Ohm
  • 2x Wavecor PR178WA01 Passive Radiator
  • 2,5x Audaphon Damping 10, 970 x 470 mm, adhesive
  • 2x Binding Post PK28 I, gold plated (one pair, red and black)
  • 3m Speaker cable 2x2.5 mm2, transparent
  • Pan screws 4x20 black, cross recess, 16 pieces
  • Plan for DIY kit

the crossover components (right),
to be mounted on a small wooden board.
  • 2x electrolytic capacitor, etched, 82 μF/100 Vdc
  • 2x electrolytic capacitor, etched, 220 μF/63 Vdc
  • 2x electrolytic capacitor, unetched, 33uF / 70 Vdc
  • 2x Mundorf air core coil L71, 27 mH/6.44 Ohm
  • 2x Mundorf bs125 core coil 12mH/0.51Ohm
  • 2x Metal-oxide resistor, 10W 1.8 Ohm (brown-grey-gold)
  • 2x Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   - not available

Kit with passive high-end crossover with a cut-off frequency of 170 Hz

  • 2x electrolytic capacitor, unetched, 82uF / 50 Vdc
  • 2x electrolytic capacitor, etched, 220 μF/63 Vdc
  • 2x electrolytic capacitor, unetched, 33uF / 70 Vdc
  • 2x Mundorf baked varnish air core coil BL71, 27 mH/6.44 Ohm
  • 2x Mundorf bs140 core coil 12mH/0.42Ohm
  • 2x Metal-oxide resistor, 10W 1.8 Ohm (brown-grey-gold)
  • 2x Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   - not available

Kit with passive filter with a cut-off frequency of 200 Hz

  • 2x Wavecor Subwoofer SW178WA01, 8 Ohm
  • 2x Wavecor PR178WA01 Passive Radiator
  • 2,5x Audaphon Damping 10, 970 x 470 mm, adhesive
  • 2x Binding Post PK28 I, gold plated (one pair, red and black)
  • 3m Speaker cable 2x2.5 mm2, transparent
  • Pan screws 4x20 black, cross recess, 16 pieces
  • Plan for DIY kit

the crossover components (right),
to be mounted on a small wooden board.
  • 2x electrolytic capacitor, etched, 68 μF/100 Vdc
  • 2x electrolytic capacitor, etched, 220 μF/63 Vdc
  • 2x electrolytic capacitor, unetched, 33uF / 70 Vdc
  • 2x Mundorf air core coil L71, 27 mH/6.44 Ohm
  • 2x Mundorf bs125 core coil 10mH/0.46Ohm
  • 2x Metal-oxide resistor, 10W 1.8 Ohm (brown-grey-gold)
  • 2x Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   - not available

Kit with passive high-end crossover with a cut-off frequency of 200 Hz

  • 2x electrolytic capacitor, unetched, 68uF / 50 Vdc
  • 2x electrolytic capacitor, etched, 220 μF/63 Vdc
  • 2x electrolytic capacitor, unetched, 33uF / 70 Vdc
  • 2x Mundorf baked varnish air core coil BL71, 27 mH/6.44 Ohm
  • 2x Mundorf bs140 core coil 10mH/0.38Ohm
  • 2x Metal-oxide resistor, 10W 1.8 Ohm (brown-grey-gold)
  • 2x Metal-oxide resistor, 10W 8.2 Ohm (grey-red-gold)

Kit without cabinet, price per speaker   - not available

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.. str-RA160, price per unit:   EUR 5,90 excl. VAT: € 4.96 / $ 5.21
We recommend one board per kit (two boards for a speaker pair)


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