SB-Horn   Floorstanding as in Hobby Hifi 2/2017

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 85 dB
  • size (HxWxD): 820 x 180 x 390 mm
  • frequency range (-8dB): 40 - 40000 Hz
  • crossover frequency(s): 2200 Hz
  • speaker type: de bocina

The SB Horn is horn speaker with drivers from SB Acoustics. The SB Horn is home to a SB12PAC25-4 woofer and SB25ADC-C000-4 tweeter.

SB Horn has been developed by Bernd Timmermanns.

Its crossover consists of a 3rd order high-pass for the tweeter. A resistor as voltage divider in series to the tweeter got a capacitor in parallel to lift the highest frequencies. The woofer is connected to a 2nd order low pass filter.

The frequency response is flat on axis between 50 Hz and 40,000 Hz except a peak at 100 to 140 Hz. The decay spectrum (waterfall diagram over frequency) is without resonances above 2 kHz. At 90 dB and 1 m, non-linear distortions remain below 0.5 % above 300 Hz.

Our kit consists of

  • SB Acoustics SB26ADC-C000-4
  • SB Acoustics SB12PAC25-4 Alu
  • Bass reflex tube HP50, 50x145 mm, black
  • 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, cross recess, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 2.2 μF / 400 Vdc
  • Audaphon MKP CAP Superior 8.2 μF / 400 Vdc
  • Audaphon MKP CAP Superior 15 μF / 400 Vdc
  • electrolytic capacitor, unetched, 22uF / 70 Vdc
  • 0.7 mm air core coil, 0.22 mH/0.39 Ohm
  • Mundorf H core coil H71, 1.2 mH/0.27 0hm
  • Metal-oxide resistor, 10W 2.7 Ohm (red-purple-gold)
  • Metal-oxide resistor, 5W 15 Ohm (brown-green-black)

Kit without cabinet, price per speaker   EUR 150,00 excl. VAT: € 126.05 / $ 136.13

Kit with high-end crossover

The high-end kit contains Mundorf EVO oil capacitors. All coils are baked varnish coils for diminishing the microphonics effect. Current flowing through the coil creates a magnetic field which on itself sets the reel of wire in motion. That motion induces a voltage in the coil which adds itself to the original signal.

Kit with high-end-crossover without cabinet, price per speaker   EUR 274,00 excl. VAT: € 230.25 / $ 248.67

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 16,50 excl. VAT: € 13.87 / $ 14.97

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 / $ 3.81
We recommend one board per kit (two boards for a speaker pair)

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