Hey r/[headphones],

I’ve been working on a one-stop computational audio solution called PrecisEQ, and I’d love to get your feedback on its audio quality, usability, and overall feature set.

Simply put, PrecisEQ is designed to simulate a professional recording studio environment right on your headphones. It’s built to be a plug-and-play experience for casual listeners, while offering deep, granular customization for audiophiles. It works perfectly with streaming apps, runs on Android 11+, and does not require root.

Here is the link: PrecisEQ on Google Play

Here is a breakdown of the core features and technical details under the hood:

• Spatial Audio: The app comes preloaded with B&K HATS HRTF data. It uses real-time binaural effect algorithms to achieve physically accurate spatial localization. It also utilizes a 4-channel cross-convolution "True Stereo IR" reverb to simulate the soundfield of a pair of 2.0 monitors in an RFZ (Reflection-Free Zone) mixing room. You can get all of this with a single tap. For power users, the advanced settings let you freely adjust the azimuth and elevation, or even import your own .sofa files to calculate spatial audio using your personalized HRTF data.
• Headphone Calibration: I maintain a high-precision, continuously updated headphone database. It provides FIR filters to calibrate your specific headphones to a flat curve, and then uses a set of IIR parameters to shape it to a target frequency response. This approach allows calibrated headphones to seamlessly hot-swap between different target curves. I've included my own diffuse-field-based target, so beginners can just select their headphone model and be good to go. If you prefer a different sound, the built-in FR editor lets you create, save, share, and import custom target curves.
• IIR Parametric EQ: Features a real-time visualizer with intuitive gesture controls (drag to move, pinch to adjust). It supports an unlimited number of EQ bands and allows setting the filter type (including Peak, Low Shelf, High Shelf, Notch, Band Pass, Low Pass, and High Pass), Gain, and Q value for any band. All IIR filters are designed to be minimum-phase.
• Convolver: Supports importing IRs at up to four sample rates (44.1kHz, 48kHz, 96kHz, and 192kHz) and automatically applies the correct IR based on your active playback sample rate. The UI displays detailed IR metadata including channel count, bit depth, duration, Taps, and the frequency response graph. Users can choose channels mapping modes:
  1. Map each IR channel to its corresponding audio channel.
  2. Use the first IR channel for all audio channels.
  3. Cross-convolution mode for True Stereo IRs.

Pricing & Unlimited Trial

PrecisEQ is completely ad-free. It uses a freemium model with a one-time purchase to unlock Premium. However, the free version offers fully functional 15-minute trial sessions with unlimited retries. You can essentially trial it forever! I highly encourage everyone to take advantage of these unlimited trials to thoroughly test the app and see if it’s right for you before paying a dime.

Setup Requirement

The only barrier to entry is that PrecisEQ requires Shizuku to run. To make this as painless as possible, I’ve built a comprehensive, interactive notification guide right into PrecisEQ. It will walk you through the exact steps, telling you precisely when and where to tap. As long as you follow along, the guide will easily get your Shizuku setup up and running.

I would truly appreciate any suggestions, critiques, or bug reports you might have. Let me know what you think!