Hadera is a two-way bassreflex bookshelf speaker with drivers of high quality from Morel. This woofer is a good choice for small enclosures. In the high range is working the Morel CAT 408. It employs a tweeter Morel CAT 408 and a woofer Morel CAW 428.
The crossover consists of a second order high-pass filter (12 dB per octave slope) for the tweeter. A bypass capacitor extends the frequency response above 10 kHz. The woofer is connected to a 2nd order low-pass filter with a series resonance circuit to smooth the frequency response curve.
Between 70 Hz and 22000 Hz, the frequency response is nearly ideal. Apart from some weak resonances the decay spectrum is nearly perfect. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are lower than 0.4% above 400 Hz and stays below 1% at 95 dB at 1 m .
the crossover components (right),
to be mounted on a small wooden board.
Kit without cabinet, price per speaker EUR 254,00 excl. VAT: € 213.45 / $ 226.25
The high-end kit is delivered with baked varnish air coils (except in parallel to the woofer) 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. All capacitors are of type MKP (polypropylen) and in series to the tweeter ClarityCaps of type ESA 250 V are employed.
Kit with high-end-crossover without cabinet, price per speaker EUR 278,00 excl. VAT: € 233.61 / $ 247.63
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 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)