Sound Performance Lab PQ Mastering Equalizer - Manual (Page 6)

6
Constant Q and proportional Q modes
Each frequency band consists essentially of two fully parametric equalizers: one for
constant Q mode and one for proportional (or variable) Q mode, selectable per band.
The PQ is the fi rst equalizer to offer both modes, endowing it with double equaliza-
tion power for demanding corrective and creative applications.
In constant Q mode, the selected bandwidth remains unaffected by the amplitude
setting, making it the best choice for corrective applications (e.g. to eliminate
unwanted frequencies). In proportional Q mode, the amplitude is reduced as the
bandwidth is raised and vice versa. With the smallest bandwidth setting, the
maximum amplitude reaches +/- 11.5 dB, while it is reduced to +/- 2.5 dB with the
broadest bandwidth setting. The Proportional Q mode is better suited for creative,
sound-shaping applications, as a bandwidth-related amplitude allows for sensible,
musically suggestive operation – with raising bandwidths, higher amplitudes are
increasingly less useful.
Controls
All variable controls are motorized and all keys are digitally controlled to provide the
same programmability and repeatability of digital units. Individual settings can be
stored in up to 800 presets.
Link mode
Channel 1 and 2 can be linked for coherent stereo operation and either channel can
be designated as master. In link mode, coupled bands can be activated/deactivated
simultaneously, while single bands may also be released from link mode if required
for individual adjustment.
Master/Slave (unit link) mode
The PQ offers a Master/Slave mode for surround applications or subgroup processing,
in which the settings on the master unit are precisely duplicated on the slave units.
Thus the PQ is the fi rst EQ system that provides up to eight channels for coherent
analog equalization of surround recordings.
Remote Control Unit
SPL offers a remote control unit with an identical user interface to the PQ, which will
be able to control up to four units—individually or in common.
Display
A central display clearly indicates all information relating to preset, storage and
control functions. The control logic is clear and intuitive without menu layers, guar-
anteeing quick and easy operation and a minimal learning curve.
Key Functions