ProBox is a two way compact speaker.
ProBox is a bass-reflex cabinet loudspeaker with drivers of Visaton .
The kit is delivered with the following drivers:
- a Visaton G 25 FFL 8 Ohm tweeter
- a Visaton W 130 S 8 Ohm midrange / bass driver
The loudspeaker has been developed by Thomas Schmidt and Holger Barske.
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 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 0,5% above 300 Hz and doesn't exceed 1% at 95 dB at 1 m between 300 and 15000 Hz.
the crossover components (right),
to be mounted on a small wooden board.
Kit without cabinet, price per speaker EUR 180,00 excl. VAT: € 151.26 / $ 172.44
The high-end kit is delivered with baked varnish air core coils 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 G 25 FFL 8 Ohm are of type polypropylen (MKP) Clarity-Cap ESA 630 V.
Kit with high-end-crossover without cabinet, price per speaker EUR 215,00 excl. VAT: € 180.67 / $ 205.97
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).
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 / $ 4.02
We recommend one board per kit (two boards for a speaker pair)