SatoriMotion   Shelf speaker as in Hobby Hifi 4/2020

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 86,5 dB
  • size (HxWxD): 370 x 180 x 300 mm
  • frequency range (-8dB): 42 - 30000 Hz
  • crossover frequency(s): 3800 Hz
  • speaker type: bass reflex

SatoriMotion is a two way compact speaker.

SatoriMotion is a bass-reflex cabinet loudspeaker with drivers of Harwood Acoustics and SB Acoustics.

The kit is delivered with the following drivers:
- a Harwood Acoustics AM 24 tweeter
- a SB Acoustics Satori MW13PNW-4 woofer

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 3rd order low-pass filter (18 dB per octave slope) for the woofer.

The frequency response of this speaker is nearly linear.

The decay spectrum is nearly perfect.

At medium volume, i.e. 90 dB at 1 m, the nonlinear distortions are below 0,35% above 200 Hz.

An excerpt from the Hobby HiFi review

Conclusion of the magazine Hobby HiFi:

Our kit consists of

  • SB Acoustics midwoofer SATORI-MW13PNW-4, nedymium, Payprus cone
  • Harwood Air Motion Transformer AM 24
  • 2x Bass reflex tube HP50, 50x143mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,25x 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)
  • 2m Speaker cable 2x2.5 mm2, transparent
  • Pan screws 4x20 black, torx, 8 pieces
  • 0,5x Visaton Countersunk screws 3.5x25, 8 pcs
  • Plan for DIY kit

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

  • Mundorf MCAP EVO 8.2 μF; / 450 V
  • Mundorf MCAP EVO Oil 3.3 μF; / 450 V
  • Mundorf MCAP EVO Oil 8.2 μF; / 450 V
  • Mundorf, electrolytic capacitor, unetched, 22μF / 70 Vdc
  • Mundorf baked varnish air core coil BL71, 3.3 mH/1.75 Ohm
  • Mundorf baked varnish air core coil BL100, 0.27 mH/0.23 Ohm
  • Mundorf baked varnish air core coil BL140, 0.15 mH/0.10 Ohm
  • Mundorf baked varnish air core coil BL140, 0.68 mH/0.23 Ohm
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)
  • Metal-oxide resistor, 10W 12 Ohm (brown-red-black)

Kit without cabinet, price per speaker   EUR 544,00 excl. VAT: € 457.14 / $ 493.71

Kit with high-end crossover

The high-end kit is delivered with copper foil and 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 Harwood Acoustics AM 24 are of type polypropylen (MKP) Mundorf MCAP EVO Silber Gold Öl.

  • Mundorf MCAP EVO Oil 8.2 μF; / 450 V
  • Mundorf MCAP EVO Silver Gold Öl 3.3 μF; / 450 V
  • Mundorf MCAP EVO Silver Gold Öl 8.2 μF; / 450 V
  • Audaphon MKP CAP Superior 22 μF; / 400 Vdc
  • Mundorf copper foil coil CFC14-0.15mH/0.08Ohm
  • Mundorf copper foil coil CFC14-0.27mH/0.11Ohm
  • Mundorf copper foil coil CFC14-0.68mH/0.20Ohm
  • Mundorf baked varnish air core coil BL71, 3.3 mH/1.75 Ohm
  • Mresist Classic 5,6 Ohm / 10 Watt
  • Mresist Classic 12 Ohm / 10 Watt
  • Metal-oxide resistor, 10W 3.3 Ohm (orange-orange-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 729,00 excl. VAT: € 612.61 / $ 661.61

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 μF; / 400 Vdc
  • Mundorf, electrolytic capacitor, unetched, 33μF / 70 Vdc
  • Mundorf baked varnish air core coil BL71, 0.33 mH/0.48 Ohm
  • ceramic resistor 6.8 Ohm/20 Watt
  • Metal-oxide resistor, 10W 10 Ohm (brown-black-black)

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 24,50 excl. VAT: € 20.59 / $ 22.24

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.. str-RA240, price per unit:   EUR 8,60 excl. VAT: € 7.23 / $ 7.81
We recommend a half board per kit (one board for a speaker pair)


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