Characteristics and sound properties
The Rotterdam is a bass-reflex cabinet loudspeaker with drivers of Beyma .
The set is equiped with the following drivers:
a Beyma TPL-75 air motion transformer (ribbon-tweeter)
a Beyma 6 G 40 FE mids driver
a Beyma 12 WR 400 woofer
The crossover consists of:
a first order high-pass filter (6 dB per octave slope) for the tweeter.
a band pass consisting of a 2nd order high pass filter (12 dB per octave slope) and a 3rd order low-pass filter (18 dB per octave slope) for the mids-woofer.
a 2nd order low-pass filter (12 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 0,5% above 250 Hz and doesn't exceed 0,8% at 95 dB at 1 m between 300 and 15000 Hz.