Co-Bold is a two way floorstanding speaker.
Co-Bold is a bass-reflex cabinet loudspeaker with drivers of Bold North Audio .
The kit is delivered with the following drivers:
- a Bold North Audio BDT-2901 tweeter
- a Bold North Audio BWX-6501 woofer
The loudspeaker has been developed by Thomas Schmidt and Thorsten Fischer.
The crossover consists of:
- a 3rd order high-pass filter (18 dB per octave slope) for the tweeter.
- a 3rd order low-pass filter (18 dB per octave slope) for the woofer.
The frequency response of this speaker is nearly linear.
The decay spectrum is nearly perfect.
At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 0,4% above 500 Hz and doesn't exceed 1,1% 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 384,00 excl. VAT: € 322.69 / $ 342.05
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 Bold North Audio BDT-2901 are of type polypropylen (MKP) Clarity-Cap ESA 630 V.
Kit with high-end-crossover without cabinet, price per speaker EUR 452,00 excl. VAT: € 379.83 / $ 402.62
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).
Price per impedance correction for one speaker, to be mounted on a small wooden board. EUR 13,30 excl. VAT: € 11.18 / $ 11.85
If you prefer to mount the crossover components on a universal PCB instead on wood
PCB 150x115 mm, tin plated, price per unit: EUR 4,70 excl. VAT: € 3.95 / $ 4.19
We recommend one board per kit (2 boards per speaker pair)