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SPL Audio PQ Mastering Equalizer
Brand:
SPL Audio
Product Highlights
- 5-Band Fully Parametric EQ
- Stepped Knobs for Recall, Rack-Mountable
- Dual-Mono or Stereo Operation
- 120V Rail Technology, Mastering Grade
- Proportional or Constant Q, Auto-Bypass Mode
Achieve unparalleled precision in your audio mastering with the SPL Audio PQ Mastering Equalizer, designed to deliver exceptionally clean and transparent sound reproduction. Featuring an expansive frequency range from 10 Hz to 100 kHz and an ultra-low distortion rate of just 0.0005%, this professional-grade equalizer ensures every detail of your mix is perfectly sculpted. Discover how this powerful tool can elevate your studio monitoring to new heights.
₹863,155
In stock
Estimated delivery dates: Apr 14, 2026 - Apr 18, 2026
In stock
PQ
Mastering Equalizer
This is a unique equalizer – for several reasons. It has two times five fully parametric filter bands, each of which can be switched between constant Q and proportional Q! And there’s sheer unlimited headroom and a very special kind of EQ sound – thanks to 120V technology.
The Filter Bands
Stepped Potentiometers
Recall of all settings is easy thanks to the potentiometers with 41 steps.
Cut/Boost & 1/4 Gain
Each filter band can be boosted or cut up to 20 dB.
If only minimal changes are required, the 1/4 Gain switch can be used to reduce the boost or cut range from +/-20 dB to +/-5 dB.
Frequencies
We have designed the frequency distribution to overlap widely between the bands, so that problematic frequencies can also be addressed with two bands.
| LF | 10 Hz – 330 Hz |
| LMF | 33 Hz – 1 kHz |
| MF | 128 Hz – 4.1 kHz |
| MHF | 310 Hz – 10.2 kHz |
| HF | 760 Hz – 24 kHz |
Bandwidth Q
The bandwidth Q determines the steepness of bell characteristic. A small Q is a wide bandwidth and a high Q a narrow bandwidth.
The labeling of the scale is divided into two parts. The values with white background refer to the proportional Q mode and the values without background refer to the constant Q mode.
Constant & Proportional Q
The blue button is used to toggle the Q mode.
In constant Q mode, the amplitude is constant regardless of the selected bandwidth. This is ideal for eliminating interfering frequencies.
In proportional Q mode, the amplitude is proportional to the bandwidth. It decreases with increasing bandwidth and vice versa. At the smallest bandwidth setting, the maximum amplitude value is +/- 20 dB, while the maximum amplitude decreases to +/- 2.8 dB at the largest bandwidth setting. This control behavior simplifies sensitive, creative processing and is musically very useful, since high amplitudes become increasingly unusable with increasing bandwidth.
On/Off
The orange button is used to switch the individual filter band on and off.
The Center Section
Auto Bypass
For an objective evaluation of the edited music program, it makes sense not to switch between the original signal and the edited signal yourself, but to leave this to an automatic system.
It is also an advantage that, for an optimal evaluation of the processing, one does not have to move from the stereo center and can concentrate fully on the program.
With the help of the Interval control the switching time window can be determined. Turning it clockwise extends the time interval.
The 120V technology
The 120V technology is our reference technology. The 120V technology is unique in the world. It operates at a DC voltage of 120 volts. This is four times that of IC-based semiconductor op-amps.
The highest possible audio quality requires the highest possible audio operating voltage.
The 120V technology works with +/-60 V. To be able to handle such a high voltage, we have developed special proprietary operational amplifiers that can operate with a DC voltage of +/-60 V: the SPL 120V SUPRA operational amplifiers.
This high voltage would destroy conventional components and operational amplifiers.
The 120V technology achieves exceptional technical specifications and sonic benefits. Technically, in terms of dynamic range, signal-to-noise ratio and headroom. Sonically, in terms of richness of detail and an absolutely relaxed listening experience.
By the way, the “120V” in the name of the technology has nothing to do with the local mains voltage from the mains power socket. This is about the operating voltage inside the device with which the audio signals are processed.
The mains voltage from the mains power socket is transformed to the required secondary voltage in the device’s internal linear power supply with toroidal transformer. Rectifiers convert this AC voltage into DC voltage required in the audio device.
The idea for SPL 120V technology and the SUPRA operational amplifier based on this technology were developed in the 1990s by SPL founder and chief developer Wolfgang Neumann.
With the goal of building the best mastering console ever, this basic technological philosophy then took shape for the first time – thus the SPL MMC1 Mastering Console for Galaxy Studios saw the light of day in 2000.
The outstanding sonic and technical features quickly got around in the scene – so further orders were not long in coming.
Besides the MMC 1, another legendary product with 120V technology was created with the PQ, the “King of Parametric Equalizers”.
Since that time, 120V technology has been the foundation for all SPL premium products. Meanwhile, not only for mastering applications, but also for the, studio or hifi use.
Comparison
Most audio devices work with an internal operating voltage of +/-15 volts and can thus process a maximum input level of +21.5 dBu. If a DAC, for example, has an output level of +22 dBu at 0 dBFS, level peaks of the music material would already cause overloads in the input stage of the device.
All components in the audio device often operate at their limits. The result is an unsteady sound that causes stress and faster ear fatigue.
SPL devices with 120V technology can handle input levels of +32.5 dBu thanks to the higher internal operating voltage of +/- 60 volts – thus offering 12 dB more headroom. All components consequently operate continuously in the optimum operating range. The result is a very pleasant, natural and relaxed sound experience. So you can enjoy your music in every detail.
These diagrams clearly show the superiority of the 120V technology in comparison to other circuits with lower, common operating voltages.
| Analog inputs & output | Maximum input & output gain : 32.5 dBu |
|---|---|
| Mains Power Supply | Mains voltage (selectable, see fuse chamber) : 230 V AC / 50; 115 V AC / 60 Hz |
| Dimensions & Weight | W x H x D (width x height x depth) : 482 x 177 x 300 mm, 19 x 6.97 x 11.8 inch |
