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About SPX Files
An .spx file is an audio file that likely stores a voice recording, music, or sound effects. It contains audio data in the Ogg Vorbis container format encoded with the Speex Audio codec and supports metadata.
Since the Speex codec is optimized for voice recordings, .spx files became a common method for transmitting and storing speech in the 2000s for various VoIP applications, podcasts, audiobooks, and video games. While the Xiph.Org Foundation no longer actively develops Speex, and the more advanced Opus codec surpassed it in efficiency, .spx files still remain a common choice for sharing and storing voice recordings.
Converting SPX Files
You may want to convert an .spx file to MP3 format since it is more widely supported. However, there will likely be some quality loss since the MP3 format is less efficient for storing voice recordings than Speex.
You can also convert .spx files to the AAC format, which is a better option than the MP3 format for retaining quality and is also widely supported (not as much as the MP3 format). However, both the AAC and Speex formats are lossy, which will result in some quality loss, and the resulting .aac file size will likely be larger than the original .spx file.
About FileHelper.com
FileHelper.com is a free web-based file utility that can open Ogg Vorbis Speex files and over 150 other file formats directly in your web browser. It displays file properties, including metadata, and image EXIF data, along with information about the corresponding file type. FileHelper.com can also view and convert images to several common formats. Have an unknown file or a file without an extension? No problem — FileHelper.com can identify over 15,000 file types.