Redmi Dolby Atmos Sound Enhancement

Overview

Redmi Dolby Atmos Sound Enhancement (authored by Skai6087) is an audio DSP calibration module developed specifically for Redmi devices.

Many Xiaomi and Redmi devices feature Dolby Atmos capable hardware and Qualcomm Hexagon DSP processors, but have restricted audio profiles or disabled spatial acoustic options on specific regional software builds. This module re-enables high-definition spatial surround audio by injecting calibrated Dolby DAX profiles directly into the vendor audio stack.

Technical Architecture & How It Works

The module operates across two key audio integration layers:

1. Vendor System Properties

During device boot, the module sets specialized audio flags via system.prop:

ro.vendor.audio.sfx.harmankardon=0
ro.vendor.audio.feature.spatial=7
ro.vendor.video_box.version=2
ro.vendor.audio.aiasst.support=true
ro.vendor.audio.sfx.earadj=true
ro.vendor.audio.sfx.scenario=true
ro.vendor.audio.surround.support=true
ro.vendor.audio.spk.stereo=true

These properties instruct the Qualcomm Audio HAL to initialize spatial acoustic virtualizers and scenario-based signal processing.

2. Dolby Audio Experience (DAX) Configuration

The module overlays /system/vendor/etc/dolby/dax-default.xml, providing multi-band dynamic range compression, speaker frequency linearization, and virtual surround channel upmixing.

Verification & Tuning

1. After installation and reboot, navigate to Settings > Sound & vibration > Sound effects.
2. Confirm that Dolby Atmos or Spatial Audio controls are active and configurable.
3. Switch between Dynamic, Video, Music, and Voice profiles to experience calibrated frequency responses.