Desk-Top BB4 is a 1 way loudspeaker that employs a Omnes Audio BB 4.01 fullrange chassis. The frequency response smoothing can be realised passive, or with an DSP. Desk-Top BB4 has been developed by Bernd Timmermanns.
The crossover consists of a 1st order low-pass filter (6 dB per octave slope) for the fullrange driver to smoothen the frequency response. In addition four parallel RCL absorption circuits smoothen the frequency response.
Between 60 Hz and 20 kHz, the frequency response of this loudspeaker is flat 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 250 Hz and below 0.3% at 80 dB/1m.
the crossover components (right), to be mounted on a small wooden board.
L2 has a DC-impedance of 3.5 Ohm. In the journal has been a printing error.
Kit without cabinet, price per speaker - not available
R2=6.8 Ohm because L2 has a lower DC-impedance.
Kit with high-end-crossover without cabinet, price per speaker - not available
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 / $ 3.81 We recommend one board per kit (two boards for a speaker pair)
Instead of a passive crossover we also deliver a pair of loudspeakers with digital signal processor (DSP). The DSP does his work between preamplifier and power amplifier.
Kit without cabinet, price per pair - not available
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