Because you are dealing with a modified APK (not from the Google Play Store), you must follow a strict protocol to avoid malware.
If the security risks of a Mod APK concern you, consider these legitimate (and often free or cheap) alternatives that provide the same virtual 3D sound effect.
Whether you are looking for a standalone player or a system-wide enhancer, these apps are highly rated for creating virtual surround sound: Get a 3D Stereo Sound Effect on Any Android - Gadget Hacks virtual 3d sound mod apk
Virtual 3D sound (also called binaural audio or spatial audio) simulates sound coming from different directions and distances around a listener. It uses to trick the brain into perceiving sound sources in 3D space using only stereo headphones.
[Stereo Audio Source] │ ▼ ┌────────────────────────┐ │ 3D Audio Virtualizer │◀─── Modifies Phase, Time Delays (ITD), │ Engine │ and Frequency Response (HRTF) └────────────────────────┘ │ ▼ [Immersive 3D Sound] ─── Adds the missing Depth Axis (Front, Back, Above) Head-Related Transfer Function (HRTF) Because you are dealing with a modified APK
Download the .apk file. Tap it and press "Install." If your phone warns about "Harmful app," tap "Install anyway" only if you trust the source.
The mod will likely ask for:
Virtual 3D Sound Mod APK is a modified version of the standard Virtual 3D Sound app, designed to provide users with an enhanced audio experience on their mobile devices. The modded version unlocks premium features that are typically behind a paywall, offering users a more immersive sound experience without the need for expensive headphones or additional hardware.