Donau is a 3 Way high-end floorstanding speaker with closed bassrange system, ceramic midrange and air-motion-transformer. The tweeter is the very linear Air Motion Transformer Audaphon AMT-1i with very low distorsion. In the Donau kit the Accuton C173-6-191E is used as mids speaker. This Accuton midrange speaker you can find in a lot of high quality speakers in the five digit price range. The woofers are Wavecor SW182BD01 with 8 mm linear excursion and low distorsion balance drive technology. This woofers are very good to use in closed bass systems.
The crossover consists of a 3rd order high-pass filter (18 dB per octave slope) for the tweeter, a bandpass filter (12 dB high - and 12 dB lowpass) for the two mids. The woofer is connected to a 2nd order low-pass filter.
Between 40 Hz and 21000 Hz, the frequency response of this loudspeaker is very linear on axis. The decay spectrum is nearly perfect. At low volume, i.e. 85 dB at 1 m, the nonlinear distortion is lower than 0.4% above 500 Hz and below 0.6% at 95 dB at 1 m .
Kit without cabinet, price per speaker *
* In the Klang+Ton Magazine is an error about the price. The price is per kit, not for a pair.
The high-end kit is delivered with an CFC I-core coil instead of an Backlack I-core coil for the woofer. In the filter for the tweeter the capacitors are ClarityCap MR capacitors. The serial coil for the midrange are a CFC coil and the serial capacitor is an ClarityCap ESA. All other capacitors are ClarityCap PWA. All other inductances are baked varnished 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.
Kit with high-end-crossover without cabinet, price per speaker
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:
We recommend four boards per kit (8 boards per speaker pair)
MDF Front for Kit Donau, price per unit
MDF cabinet kit for Kit Donau,
price per unit
Assembled MDF cabinet (without paint) for Kit Donau,
price per unit
Assembled cabinet with white paint for Kit Donau, price per unit