BK-12m and BK-12m-Sol are two small floorstanding horn speakers with Fostex fullrange speakers.
BK12M has been developed by Bernd Timmermanns, Madisound USA and Günter Damde.
The speaker is built as a backloaded horn.
The crossover contains two wave traps in series to the speaker.
Between 200 Hz and 10 kHz, the frequency response of this loudspeaker is nearly smooth on axis. The decay spectrum is nearly without faults. At low volume, i.e. 90 dB at 1 m, the nonlinear distortions are below 1% above 200 Hz.
the crossover components (right),
to be mounted on a small wooden board.
Kit without cabinet, price per speaker EUR 114,00 excl. VAT: € 95.80 / $ 108.25
The high-end kit comes with Mundorf MCAO EVO oil capacitors and Mundorf baked varnish air core coils which minimize the 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.
Kit with high-end-crossover without cabinet, price per speaker EUR 168,00 excl. VAT: € 141.18 / $ 159.53
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 159 x 127 mm universal PCB instead on wood:
Universal PCB RA160, order no.. I-2766, price per unit: EUR 5,10 excl. VAT: € 4.29 / $ 4.84
We recommend one board per kit (two boards for a speaker pair)
Hobby HiFi Overview