Digibox 87 HP is a very small loudspeaker that employs a Visaton SL87 FE fullrange driver.
Digibox 87 HP has been developed by Bernd Timmermanns.
The speaker is built in a closed cabinet with a high-pass filter with different crossover frequencies to harmonize perfectly with a subwoofer.
The crossover consists of two RCL filters in series, one serial RCL and a 2nd order high pass filter (12dB per octave slope).
Between 300 Hz and 6 kHz, the frequency response of this loudspeaker is linear on axis. The decay spectrum is nearly perfect. At low volume, i.e. 90 dB at 1 m, the nonlinear distortions are below 1% above 400 Hz.
We deliver Digibox 87 HP with different cut-off frequencies to adopt it to a subwoofer. If you don't want to use a subwoofer, we recommend the the DIY kit Digibox 87 without high-pass filter.
the crossover components (right), to be mounted on a small wooden board.
Kit without cabinet, price per speaker EUR 75,00 excl. VAT: € 63.03 / $ 68.07
Kit without cabinet, price per speaker EUR 74,00 excl. VAT: € 62.18 / $ 67.16
Kit without cabinet, price per speaker EUR 78,00 excl. VAT: € 65.55 / $ 70.79
Kit without cabinet, price per speaker EUR 80,00 excl. VAT: € 67.23 / $ 72.61
The high-end kit comes with two polypropylen capacitors (MKP) and two baked varnish coils in the serial RCL. 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.
Kit without cabinet, price per speaker EUR 135,00 excl. VAT: € 113.45 / $ 122.52
Kit without cabinet, price per speaker EUR 117,00 excl. VAT: € 98.32 / $ 106.18
Kit without cabinet, price per speaker EUR 106,00 excl. VAT: € 89.08 / $ 96.20
Kit without cabinet, price per speaker EUR 112,00 excl. VAT: € 94.12 / $ 101.65
Kit without cabinet, price per speaker EUR 122,00 excl. VAT: € 102.52 / $ 110.72
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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