| SPL High Gain Technology
SPL is constantly pushing analog signal processing
to its limits by combining the best possible components with perfectly optimized
circuit design. As our latest achievement in this ongoing process, SPL's High
Gain Series surpasses the hitherto accepted limits of audio signal processing
and combines truly unparalleled analog sound quality with the control and
convenience of digital units.
Further High Gain projects are in planning,
including a microphone preamplifier and a compressor, although no availability
projections can be made for these currently.
PQ 2050
The PQ is a fully parametric,
dual-channel 5-band equalizer. As with all SPL High Gain units, the PQ has an
operating voltage of 124 V and is constructed with the best analog components
available.
The Filter Stages
The individually switchable filter
bands are self-contained on separate circuit boards. Contrary to most
conventional equalizers, the bands are not summed via a central stage, so that
the signal passes only through those filter stages which are
activated.
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 first equalizer to offer both modes, endowing it with double equalization
power for demanding corrective and creative applications.
In constant Q mode,
the selected bandwidth remains unaffected by the amplitude setting, making it
the better choice for corrective applications (e.g. to eliminate unwanted
frequencies). In proportional Q mode, the bandwidth is reduced as the amplitude
is raised and vice versa. This more "musical" operating mode is better suited
for creative, sound-shaping applications.
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 24,000
presets.
Motorized potentiometers
The adjustment range of the Frequency,
Bandwidth and Amplitude potentiometers is evenly dispersed throughout the
300-degree movement area, ensuring smooth and continuous adjustments and extreme
operational security. The high resolution of each respective value (e.g. Q from
0.1-3.7, evenly distributed over 300 degrees) allows extremely precise
adjustments as well as accurate repeatability.
We intentionally avoided
unnecessary or confusing functions such as frequency range switching or
frequency, bandwidth or amplitude multiplicators.
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
FThe 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
first EQ system that provides up to eight channels for coherent analog
equalization of surround recordings.
Remote Control Unit
SPL is developing 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, guaranteeing quick and easy operation and a
minimal learning curve.
Frequency
Each channel provides five fully parametric frequency
bands covering 10 Hz to 28 kHz. Each band overlaps its neighbor by one octave
and can be independently activated and deactivated.
The following frequency
bands are provided:
LF (Low Frequencies): 10 Hz-235 Hz
LMF (Low Mid
Frequencies): 35 Hz-720 Hz
MF (Mid Frequencies): 330 Hz-7.1 kHz
HMF (High
Mid Frequencies): 670 Hz-16 kHz
HF (High Frequencies): 1.2 kHz- 28
kHz
Amplitude
Amplitude settings are freely adjustable from -11.5
to + 11.5 dB. The lower range between 0 and 2.5 dB offers extremely high
resolution, allowing delicate adjustments with maximum precision.
Bandwidth
Bandwidth is adjustable between 0.1 and 3.6 Q in
proportional Q mode and between 0.7 and 15 Q in constant Q mode. The extremely
high maximum bandwidth in constant Q mode enables tight, selective control in
precision applications.
Illuminated keys
The PQ features illuminated keys that
illuminate brightly when activated.
LF, LMF, MF, HMF and HF keys
These keys activate (key lamps
lit) or deactivate (lamps off) the 10 filter bands.
Con. Q key
This key switches the 10 filter bands between
proportional Q mode (lamps off) and constant Q mode (lamps lit).
Additional construction features
All crucial resistors
in the I/O and filter circuits are subject to ultra-tight tolerances of 0.001%
to ensure clean and accurate amplifier stage performance. All circuit board
tracks are double-width (1 mm) and double-thickness (70 micrometers),
guaranteeing stable high-gain operation with minimum resistivity. A separate
grounding track is placed between signal track pairs, virtually eliminating
crosstalk for maximum signal separation.
Connections: The PQ is fitted with XLR I/O connectors.
Technical specifications
Input impedance (balanced):
10 kOhm
(Welwyn precision resistors; transformerless)
Output
impedance (balanced): 600 Ohm
(CMR trimmers,
transformerless)
Overload resistance: +34 dB
Harmonic
distortion:
@ -30 dBu: 0.2%
@ -20
dBu: 0.05%
@ 0 dBu: 0.01%
@ +10 dBu: 0.002%
@ +30 dBu: 0.0005%
S/N
ratio: A-rated: -108 dBu
CCIR 468-3: -97 dBu
Transmission bandwidth: 8
Hz-200 kHz
Processed frequency range: 10 Hz-28 kHz
Phase: +5.5° @ 10
Hz
0° @ 1 kHz
-1.23° @ 10 kHz
-8.8° @ 100 kHz
-11.25° @ 200
kHz
Common mode rejection: > 70 dB @ 100 Hz, 1 kHz, 10 kHz
Dimensions:
Standard EIA 19" rack chassis (4 units)
Weight: 18,25 kg/40,15
lbs
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