Note S   Shelf speaker as in K+T 4/2020

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 84 dB
  • size (HxWxD): 260 x 170 x 220 mm
  • frequency range (-8dB): 50 - 23000 Hz
  • crossover frequency(s): Hz
  • speaker type: bass reflex

Note S is a two way compact speaker.

Note S is a bass-reflex cabinet loudspeaker with drivers of Omnes Audio and Tang Band.

The kit is delivered with the following drivers:
- a Omnes Audio AMT 50 air motion transformer (ribbon-tweeter)
- a Tang Band W4-655 woofer

The loudspeaker has been developed by Baur Akustik.

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

The frequency response of this speaker is nearly linear.

The decay spectrum (waterfall spectrum) shows a decelerated swing-out behaviour in the mid-range.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 0,7% above 300 Hz and doesn't exceed 1,1% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Omnes Audio AMT 50
  • Tang Band W4-655 C, unshielded
  • Damping fleece MT Bondum 800 (30 x 50 x 2 cm)
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,25x Damping Sonofil 100 x 35 cm for 20 litres
  • Terminal T105 Au, with brass, gold plated
  • 1,5m Speaker cable 2x1.5 mm2, transparent
  • 1,5x Pan screws 3.5x17 black, torx, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 8.2 μF; / 400 Vdc
  • Audaphon MKT CAP 5.6 μF; / 160 Vdc
  • Mundorf air core coil L50, 0.15 mH/0.47 0hm
  • Audaphon M core coil M12, 1.5 mH/0.16 0hm
  • Metal-oxide resistor, 10W 2.7 Ohm (red-purple-gold)
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)

Kit without cabinet, price per speaker   EUR 116,00 excl. VAT: € 100.00 / $ 117.00

Kit with high-end crossover

The high-end kit is delivered with a baked varnish air core coil 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 capacitor for the Omnes Audio AMT 50 is of type polypropylen (MKP) Clarity-Cap ESA 250 V.

  • ClarityCap ESA capacitor 8.2 μF; / 250 Vdc
  • Audaphon MKP CAP Superior 5.6 μF; / 400 Vdc
  • Mundorf air core coil L50, 0.15 mH/0.47 0hm
  • Mundorf H core baked varnish coil BH100, 1.5 mH/0.17 0hm
  • Metal-oxide resistor, 10W 2.7 Ohm (red-purple-gold)
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 125,75 excl. VAT: € 108.41 / $ 126.83

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 15 μF; / 160 Vdc
  • 0.7 mm air core coil, 1.2 mH/1.08 Ohm
  • ceramic resistor 12 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 14,38 excl. VAT: € 12.40 / $ 14.50

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.. I-2765, price per unit:   EUR 3,61 excl. VAT: € 3.11 / $ 3.64
We recommend one board per kit (two boards for a speaker pair)


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