Bigasoft Audio Converter 

Bigasoft Audio Converter enables Mac users to convert their songs and audio books to various sound file formats, like AIFF, AAC, AC3, AU, DTS, MP3, OGG, MP2, and many others. This program is also capable of extracting soundtracks from movies and trimming audio files with just a few clicks.

You can import multiple files of different formats, pre-listen them before launching the conversion process, choose individual output profiles if necessary. The utility immediately provides you with the output files you need, without any quality loss.

This conversion tool might prove to be of good use whenever you're dealing with incompatibility issues between your sound files and the audio editors from your Mac. The utility also enables you to convert audio files to formats that are supported by multiple media devices, like iPhones, iPads, game consoles, etc.

You can also use this program to extract segments from audio books and save them as individual sound files or trim large music mixes into multiple tunes.

An important advantage is the fact that the application preserves the quality of the input files.

So, you should definitely buy this Mac utility if you're looking for an efficient and simple to handle audio conversion tool. Plus, it's cheap.