Audimax Bookshelf BE   Shelf speaker as in Hobby Hifi 1/2018

Technical data
  • impedance: 12 Ohm
  • sensivity (2,83V/1m): 81 dB
  • size (HxWxD): 440 x 220 x 340 mm
  • frequency range (-8dB): 33 - 45000 Hz
  • crossover frequency(s): 1700 Hz
  • speaker type: bass reflex

Audimax Bookshelf BE is a two way compact speaker.

Audimax Bookshelf BE is a closed-cabinet loudspeaker with drivers of Hobby-HiFi (Made by SEAS) and SB Acoustics.

The kit is delivered with the following drivers:
- a Hobby-HiFi (Made by SEAS) 18MW12T woofer
- a SB Acoustics SATORI TW29BN tweeter

The loudspeaker has been developed by Bernd Timmermanns.

The crossover consists of:
- a 2nd order low-pass filter (12 dB per octave slope) for the woofer.
- a 3rd order high-pass filter (18 dB per octave slope) for the tweeter.

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 0,5% above 200 Hz.

Our kit consists of

  • SB Acoustics SATORI-TW29BN
  • Hobby-HiFi 18MW12T (Made by Seas)
  • Bass reflex tube HP70 XL, 70x220 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 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)
  • 2m Speaker cable 2x2.5 mm2, transparent
  • 1,5x Pan screws 4x20 black, 8 pieces
  • Plan for DIY kit

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

  • Mundorf MCAP Supreme 4.70 uF / 600 V
  • Audaphon MKP CAP Superior 0.22 uF / 400 Vdc
  • Audaphon MKP CAP Superior 2.2 uF / 400 Vdc
  • Audaphon MKP CAP Superior 4.7 uF / 400 Vdc
  • Audaphon MKP CAP Superior 5.6 uF / 400 Vdc
  • Mundorf baked varnish air core coil BL71, 0.33 mH/0.48 Ohm
  • Mundorf baked varnish air core coil BL71, 0.47 mH/0.57 Ohm
  • Mundorf baked varnish air core coil BL100, 0.68 mH/0.39 Ohm
  • Mundorf baked varnish air core coil BL140, 4.7 mH/0.83 Ohm
  • Metal-oxide resistor, 10W 10 Ohm (brown-black-black)
  • 2x Metal-oxide resistor, 5W 1.0 Ohm (brown-black-gold)
  • 2x Metal-oxide resistor, 5W 4.7 Ohm (yellow-violet-gold)

For the speaker you need additionally ca. 36 cm of flexible aluminium tube NW63. You get it in specialist market for ventilation, or in online shops.

Kit without cabinet, price per speaker   EUR 908,00 excl. VAT: € 763.03 / $ 862.22

Kit with high-end crossover

The high-end kit is delivered with 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. One capacitor for the tweeter is of type polypropylen (MKP) Mundorf Supreme Silver/Gold/Oil.

For the speaker you need additionally ca. 36 cm of flexible aluminium tube NW63. You get it in specialist market for ventilation, or in online shops.

Kit with high-end-crossover without cabinet, price per speaker   EUR 1096,00 excl. VAT: € 921.01 / $ 1040.74

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).


Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 20,49 excl. VAT: € 17.22 / $ 19.46

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 / $ 4.84
We recommend two boards per kit (four boards for a speaker pair)


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