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Positive Grid BIAS Pro Series EQ Plug-Ins




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Equalizer Tube/Passive/Digital

The world’s first analog EQ matching and component based studio plug-ins



Over the past decade, professional effects plug-ins have been about authentic analog emulation of original hardware, with either a black-box approach or circuit analysis and emulation. This gives musicians an easy-to-use user interface and faithful reproduction of analog tone in the digital domain.

Looking forward, the question is how we can create new tools to maximize the sound quality and usability with today’s new technology, with faster processors and memory, matching analysis, advanced nonlinear processing, and a cloud-based worldwide community. What can we do better, smarter, and more efficient?

Positive Grid teamed up the world’s brightest DSP engineers and component level modeling and matching authorities, working with the world’s leading producers, world-class engineers, and mixing & mastering gurus to develop some breakthrough technologies to bring software plug-ins to the next level.



After years of research and development with the world’s best DSP engineers, we are proud to introduce a new way of EQ matching, one that truly recreates real world outboard analog equalizers – for the first time at component level. We used analog filters to match the frequency response for each EQ module: digital, tube, and passive EQ.

The EQ match works by analyzing the signal from the input track and side chain track – you can even see the frequency response of the matching process in real time. It then analyzes the difference curve between input and side chain, and automatically adjusts the controls to match the different curves.

The Pro Series EQ match process uses analog filters to match the frequency response difference, without adding post filters to compensate the frequency response difference. The end result is a more natural sound with real world analog sound characteristics.



Loaded with 12AX7, 12AU7 and 12AT7 preamp tubes, the tube EQ captures the essence of analog EQ found in the best professional studios in the world, giving you the ultimate solution to add color and warmth to your recordings. It comes with low, mid, and high control panels so you can get a full frequency range control in one single EQ module.



Provides the most clear and transparent digital EQ sound ever in a plug-in. With 5 bands plus high pass and low filter for each channel, its wide range control will give your mixes the necessary sound balance for professional use. You can also use the digital EQ module to shape your tracks tone without altering the output signal.



With 3 band controls for each channel, the passive EQ module gives an authentic analog sounding EQ shaping for a more musical mix. You can use the available tube power amplifier emulation to add even more color to the output sound, and get that rich tone from real world tube amplifier EQ racks.



Positive Grid is currently working with mixing and mastering gurus and engineers to create professional compressor match models made from recordings in leading studios. Stay tuned, as more is coming.




OS X 10.7 or later
Audio Units, VST, RTAS, AAX Native
4GB of RAM minimal, 8GB or more recommended
400MB free disk space
Pro Series plug-in requires A DAW software (Digital Audio Workstation) to host, it doesn’t have a Standalone version at this moment.


Windows 7 (SP1) or Windows 8, Windows 10
4GB of RAM minimal, 8GB or more recommended
1.5GHz Dual core processor minimal, 2.0GHz Dual core or more recommended
250MB free disk space for per version (32 or 64 bits)
Pro Series plug-in requires A DAW software (Digital Audio Workstation) to host, it doesn’t have a Standalone version at this moment.

Support Host

Ableton Live8.0 or above
Avid Pro Tools10 or above
Ardour3.0 or above
Apple Logic Pro9.0 or above
Apple GarageBand6.0.5, 10.0 or above
Bitwig Studio1.0 and above
Cakewalk SonarX2 or above
Cockos Reaper3.4 or above
Harrison Mixbus2.0 or above
Steinberg Cubase5.0 or above
Steinberg Nuendo4.3 or above
MuTools MuLab6.0 or above
PreSonus Studio OneProducer/Professional 2 or above