Voice Horn   Shelf speaker as in K+T 4/2020

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 89 dB
  • size (HxWxD): 500 x 260 x 348 mm
  • frequency range (-8dB): 38 - 24000 Hz
  • crossover frequency(s): 1500 Hz
  • speaker type: closed box

Voice Horn is a two way compact speaker.

Voice Horn is a closed-cabinet loudspeaker with drivers/horns of Celestion, Visaton and Scan Speak.

The kit is delivered with the following drivers:
- a Celestion CDX1-1445 + Visaton HT 21 horn with driver
- a Scan Speak 22W-4534G00 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 0,5% above 300 Hz and doesn't exceed 0,8% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Visaton Horn HT 21
  • ScanSpeak Woofer 22W-4534G00
  • Celestion CDX1-1445, 1.4 inch-PETP-Driver
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x2.5 mm2, transparent
  • 2x Pan screws 4x20 black, torx, 8 pieces
  • Plan for DIY kit

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

  • Audaphon MKP CAP Superior 400 Vdc
  • Audaphon MKP CAP Superior 400 Vdc
  • Audaphon MKP CAP Superior 400 Vdc
  • Audaphon MKP CAP Superior 400 Vdc
  • 0.7 mm air core coil
  • 0.7 mm air core coil
  • Audaphon M core coil M12
  • Metal-oxide resistor, 10W
  • Metal-oxide resistor, 5W
  • Metal-oxide resistor, 5W
  • Metal-oxide resistor, 5W

Kit without cabinet, price per speaker   EUR 258,32 excl. VAT: € 222.69 / $ 260.55

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 Celestion CDX1-1445 + Visaton HT 21 are of type polypropylen (MKP) Clarity-Cap CSA 250 V.

  • ClarityCap CSA capacitor 250 Vdc
  • Audaphon MKP CAP Superior 400 Vdc
  • Audaphon MKP CAP Superior 400 Vdc
  • Audaphon MKP CAP Superior 400 Vdc
  • Mundorf baked varnish air core coil BL71
  • Mundorf baked varnish air core coil BL71
  • Mundorf baked varnish air core coil BL140
  • Metal-oxide resistor, 10W
  • Metal-oxide resistor, 5W
  • Metal-oxide resistor, 5W
  • Metal-oxide resistor, 5W

Kit with high-end-crossover without cabinet, price per speaker   EUR 284,64 excl. VAT: € 245.38 / $ 287.09

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).

  • JB, electrolytic capacitor, bipolar advanced, 22μF / 50 Vdc
  • 0.7 mm air core coil, 0.56 mH/0.55 Ohm
  • ceramic resistor 4.7 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 8,73 excl. VAT: € 7.53 / $ 8.81

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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