Owners Manual
3
Introduction
King of the parametric equalizers
The PQ Mastering Equalizerisafullyparametric,dual-channelve-bandequalizer.
The PQ Mastering Equalizer – Model 1540/1544 is a new revised edition of the well-
known SPL PQ Mastering Equalizer – Model 2050.
Both units are based on our 120V Rail Technology. The new PQ features the same
high-quality characteristics as the previous model.
Allvebandscaneachbeactivatedordeactivatedandyougotthepossibility(forevery
single band) to separately switch between Constant Q and Proportional Q. This kind of
circuit has not yet been achieved in any other equalizer.
Each channel can completely be activated or deactivated, thanks to Auto-Bypass, even
automated in a freely selectable time frame.
Bypass of each band and constant Q of the left side can be controlled by the right side in
Link mode.
Thanks to the 1/4 Gain-Switch, you can reduce a maximum increase or attenuation of
the amplitude by the factor 3/4, which regulates the potentiometer from max +/-20 dB
to +/-5 dB cut. This gives you the possibility to perform small corrections, as common in
Mastering or higher amplitudes in Proportional-Q mode.
Thanks to the detented potentiometers, a precise recall is very easy to realize. You can
alsoadjustparametersGain,FrequencyandQin41stepswiththedetentedpotentiome-
ters.
The PQ Mastering Equalizer was designed, developed and manufactured in Germany.