AAC stands for Advanced Audio Coding - a standardized, lossy compression and encoding for digital audio. This type of files usually offers better sound than MP3 with similar bit rates. It is also a lossy format, so when a CD quality files are converted some of the data will be removed from the files, which should not impact listening experience. However it is not the same sound as a CD-quality file would provide. Just as with MP3 the quality of AAC files measures in bit rate.
Even though AAC is considered to be more advanced and developed audio format, there are times when one simply needs an MP3 more than an AAC. MP3 is more known and well-spread for that matter. But for those times when you need to play AAC audio there is the perfect AAC player - Elmedia Player for Mac.
Elmedia is a very easy going app that additionally to being user friendly and simple has a variety of handy settings. It offers virtual speakers for headphones to help improve your headphone experience by making the sound similar to that from loudspeakers, with each ear hearing both channels. There is a graphic 10-band equalizer for the most flexible shaping of sound. For simpler sound adjustment there are popular presets like Large Hall, Party, etc., and of course you can create your custom presets.
If you are looking for a fantastic acoustic experience Elmedia Player is the first choice, because it is not just the AAC music but also the movies with AAC soundtracks it can play.