Bigasoft MP3 Converter 

This utility was created for Mac users who need to convert their audio files to the MP3 format. The application is also capable of extracting audio content from movies and saving it as an MP3 file, provides you with multiple output profiles besides the aforementioned one, and offers you a very simple and quick way to trim audio files on your Mac.

Bigasoft MP3 Converter features a built-in audio player where you can pre-listen the input files, a set of advanced output configurations (choose audio codec, sample rate, etc.), and an option to merge all input files. What's more, the application immediately converts the imported media files, even when selecting a large amount of videos and songs for conversion and choosing individual output profiles.

In my testing, the program worked flawlessly. It was very simple to configure, preserved the quality of the input videos and audio files, and offered me the output files almost instantly.

Other than that, not much more can be said about Bigasoft MP3 Converter. It does exactly what's being stated on its homepage without using many CPU resources or losing quality of the input files.

So, if you're looking for an efficient and simple audio conversion utility you should definitely give this program a try.