Model 2050
Parametric Mastering Equalizer

"The king of parametrics." (Resolution, UK)

• Pure analog, discrete Class A equalization circuitry
• Constant Q and proportional Q equalization (selectable per band)
• Digital storability and total recall with motorized controls
• Channel link and master/slave unit link modes (deactivatable per band)
• 120 Volt internal operating voltage for clean, consistent audio
• Remote control unit controls up to four PQ's for surround processing*
• SPL's discrete SUPRA op-amps with 150 dB dynamic range
• Exactly the equalizer you've been wishing someone would build ...

Details

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, the 120V Mastering 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.
PQ 2050

The PQ is a fully parametric, dual-channel 5-band equalizer. As a member of the 120V Mastering Series, the PQ is based upon SPL's unique 120V SUPRA op-amps. Only the finest components are used throughout to offer the ultimate sound and built quality.

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.

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.

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
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

Technical specifications external power supply

The PQ comes with an external linear power supply featuring a toroidal transformer for optimal audio quality and dramatically reduced inductive disturbance/interference.
Input voltage: 110-120V/60Hz or 220-240V/50Hz
Output voltage: +/- 60 V AC
Noise: › -100 dBu
Dimensions: Width: 15 cm (5 9/10 inch)
Depth: 24,5 cm (24 1/2 inch)
Height: 7 cm (2 3/4 inch)
Weight: 4,2 kg (9,24 lbs)