Considering both .mpa and .ac3 files are audio formats, it is likely that mpa to ac3 conversion is doable. The real trouble will be with finding audio converters or audio editors that support both of these file formats. You can perhaps get more alternatives by searching for mpg to ac3 conversion as well.
Home > Search converters: mpa to ac3
Conversion of mpa file format to ac3 file format beta
Search for mpa to ac3 converter or software able to handle these file types.
Convert MPEG audio to Dolby Digital sound.
We have found 3 software records in our database eligible for .mpa to .ac3 file format conversion.
Microsoft Windows software 
- convert mpa to ac3 on Windows
Adobe Premiere Pro
A timeline-based video editing software from Adobe
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from mpa file | No | Yes | No | No | No | No | No | No |
to ac3 file | No | Yes | Yes | ac3 editor | No | No | No | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned mpa to ac3. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
xrecode
An audio converter and audio-grabber for Windows
Apple macOS / Mac OS X software 
- convert mpa to ac3 on OS X
Tiny Audio Converter
Audio converter for Mac
Additional links: Open mpa file, Open ac3 file
MPA
Files with mpa file extension are generally audio-only MPEG files. These were used mostly in the past.
AC3
An ac3 file extension is associated with the Dolby Digital sound file format also known as AC3 (Audio Coding 3).
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