Arecibo   Shelf speaker as in K+T 2/2021

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 82 dB
  • size (HxWxD): 240 x 158 x 224 mm
  • frequency range (-8dB): 50 - 20000 Hz
  • crossover frequency(s): 3400 Hz
  • speaker type: bass reflex

Arecibo is a two way compact speaker.

Arecibo is a bass-reflex cabinet loudspeaker with drivers of Visaton and Visaton.

The kit is delivered with the following drivers:
- a Visaton BF 32 full range driver
- a Visaton TI 100 midrange / bass driver

The loudspeaker has been developed by Holger Barske and Thomas Schmidt.

The crossover consists of:
- a 3rd order high-pass filter (18 dB per octave slope) for the full range driver.
- a 3rd order low-pass filter (18 dB per octave slope) for the mids-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 0,3% above 400 Hz and doesn't exceed 1,1% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Visaton BF 32, 8 Ohm
  • Visaton TI 100, 8 Ohm
  • Bass reflex tube BR30, 32x63 mm, black
  • Damping Sonofil 100 x 35 cm for 20 litres
  • 0,5x Foam N25-30, 50 x 50 cm, black
  • Spring loaded terminal T56 D
  • 2m Speaker cable 2x1.5 mm2, transparent
  • 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 MKT CAP 4.7 μF / 160 Vdc
  • Audaphon MKT CAP 8.2 μF / 160 Vdc
  • JB, electrolytic capacitor, bipolar advanced, 4.7 μF / 50 Vdc
  • 1.0 mm air core coil, 0.47 mH/0.32 Ohm
  • 1.0 mm air core coil, 2.2 mH/0.89 Ohm
  • 0.7 mm air core coil, 0.15 mH/0.28 Ohm

Kit without cabinet, price per speaker   EUR 192,00 excl. VAT: € 161.34 / $ 190.39

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 Visaton BF 32 are of type polypropylen (MKP) Audaphon MKP Superior.

  • Terminal T105 with gold plated brass terminals
  • Audaphon MKP CAP Superior 4.7 μF / 400 Vdc
  • Audaphon MKP CAP Superior 8.2 μF / 400 Vdc
  • Audaphon MKT CAP 4.7 μF / 160 Vdc
  • Mundorf baked varnish air core coil BL71, 0.15 mH/0.28 Ohm
  • Mundorf baked varnish air core coil BL100, 0.47 mH/0.32 Ohm
  • Mundorf baked varnish air core coil BL100, 2.2 mH/0.83 Ohm

Kit with high-end-crossover without cabinet, price per speaker   EUR 215,00 excl. VAT: € 180.67 / $ 213.19

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, 68 μF/100 Vdc
  • 0.6 mm core coil 3.9 mH/1.58 Ohm
  • Metal-oxide resistor, 5W 6.8 Ohm (blue-grey-gold)

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 7,70 excl. VAT: € 6.47 / $ 7.64

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.. str-RA160, price per unit:   EUR 5,60 excl. VAT: € 4.71 / $ 5.55
We recommend one board per kit (two boards for a speaker pair)


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