Voice Horn 3   Shelf speaker as in K+T 5/2020

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 85 dB
  • size (HxWxD): 440 x 240 x 350 mm
  • frequency range (-8dB): 45 - 20000 Hz
  • crossover frequency(s): Hz
  • speaker type: bass reflex

Voice Horn 3 is a two way compact speaker.

Voice Horn 3 is a bass-reflex cabinet loudspeaker with drivers of Sica .

The kit is delivered with the following drivers:
- a Sica HFU 6x8"/83.26, 8Ohm horn with driver
- a Sica 6,5H 1,5 CP, 8 Ohm woofer

The loudspeaker has been developed by Wolfgang Graßhoff.

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 is nearly perfect.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 0,7% above 300 Hz and doesn't exceed 1,5% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Sica 6,5H 1,5 CP, 8 Ohm(Z004100)
  • Sica HFU 6x8"/83.26, 8Ohm(Z009501)
  • 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
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m 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 1.8 μF; / 400 Vdc
  • Audaphon MKP CAP Superior 10 μF; / 400 Vdc
  • Audaphon MKP CAP Superior 12 μF; / 400 Vdc
  • 1.0 mm air core coil, 0.47 mH/0.32 Ohm
  • 1.0 mm air core coil, 0.68 mH/0.39 Ohm
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • Metal-oxide resistor, 10W 15 Ohm (brown-green-black)
  • Metal-oxide resistor, 5W 2.2 Ohm (red-red-gold)
  • Metal-oxide resistor, 5W 3.3 Ohm (orange-orange-gold)

Kit without cabinet, price per speaker   EUR 173,00 excl. VAT: € 149.14 / $ 174.49

Kit with high-end crossover

The high-end kit is delivered with 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 Sica HFU 6x8"/83.26, 8Ohm are of type polypropylen (MKP) Clarity-Cap CSA 630 V.

  • ClarityCap CSA capacitor 1.8 μF; / 630 Vdc
  • Audaphon MKP CAP Superior 10 μF; / 400 Vdc
  • Audaphon MKP CAP Superior 12 μF; / 400 Vdc
  • Mundorf baked varnish air core coil BL71, 0.47 mH/0.57 Ohm
  • Mundorf baked varnish air core coil BL100, 0.47 mH/0.32 Ohm
  • Mundorf baked varnish air core coil BL100, 0.68 mH/0.39 Ohm
  • Metal-oxide resistor, 10W 15 Ohm (brown-green-black)
  • Metal-oxide resistor, 5W 2.2 Ohm (red-red-gold)
  • Metal-oxide resistor, 5W 3.3 Ohm (orange-orange-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 196,00 excl. VAT: € 168.97 / $ 197.69

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 2.7 μF; / 160 Vdc
  • 0.7 mm air core coil, 0.47 mH/0.50 Ohm
  • ceramic resistor 12 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 7,11 excl. VAT: € 6.13 / $ 7.17

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 4,97 excl. VAT: € 4.28 / $ 5.01
We recommend one board per kit (two boards for a speaker pair)


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