Twerc is an two way floorstanding speaker with drivers of high quality from Wavecor. The kit is delivered with Wavecor TW022WA04 tweeter. The woofers are the Wavecor WF120BD04 with balance-drive technology (BD) and fibre glass cone.
Twerc has been developed by Wolfgang Grasshoff, Lautsprecher-Berlin.
The crossover consists of a 2nd order high-pass filter (12 dB per octave slope) for the tweeter. The woofers are connected to a 2 nd order low-pass filter (12 dB per octave slope).
The frequency response of this speaker is nearly linear; Wolfgang Grasshoff choose a drop of acoustic pressure in the presence range. The decay spectrum is nearly perfect. At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are mostly lower than 0,5% above 300 Hz.
the crossover components (right),
to be mounted on a small wooden board.
Kit without cabinet, price per speaker EUR 292,44 excl. VAT: € 252.10 / $ 297.48
The high-end kit is delivered with baked varnish air 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. All capacitors are MKP capacitors (polypropylen); in series to the tweeter a ClarityCap type ESA is applied.
Kit with high-end-crossover without cabinet, price per speaker EUR 315,83 excl. VAT: € 272.27 / $ 321.28
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.. I-2765, price per unit: EUR 3,61 excl. VAT: € 3.11 / $ 3.67
We recommend one board per kit (two boards for a speaker pair)