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 74,70 excl. VAT: € 62.77 / $ 67.17
Kit without cabinet, price per speaker EUR 76,40 excl. VAT: € 64.20 / $ 68.70
Kit without cabinet, price per speaker EUR 74,60 excl. VAT: € 62.69 / $ 67.08
Kit without cabinet, price per speaker EUR 79,60 excl. VAT: € 66.89 / $ 71.57
Kit without cabinet, price per speaker EUR 81,70 excl. VAT: € 68.66 / $ 73.46
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 - not available
Kit without cabinet, price per speaker EUR 106,00 excl. VAT: € 89.08 / $ 95.31
Kit without cabinet, price per speaker EUR 112,00 excl. VAT: € 94.12 / $ 100.71
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 / $ 3.78
We recommend one board per kit (two boards for a speaker pair)
Hobby HiFi Overview