To Reproduce:
0. The "long.ogg" AudioClip is set to "Decompress on Load" and loaded from an AssetBundle.
1. Build & Run a standalone player. Click on Download.
2. Look at the memory usage in the Profiler:

After Download & Load: FMOD: 109.9MB, AudioClips: 1 / 109.7MB, Total Memory: 16.2MB, Activity Monitor : 172.5MB

3. Change the load type of the "long.ogg" file to "Stream from Disk" and rebuild the long.unity3d assebundle. (TEST -> Build AssetBundle from selection)
4. Build the standalone player and look at the memory usage in the profiler:

After Download & Load: FMOD: 109.9MB, AudioClips: 1 / 62.7KB, Total Memory: 16.2MB, Activity Monitor : 170.2MB

The question is : Why does the Activity Monitor report similar memory use, but the Unity Profiler reports 2x109MB being used?

Premium Support case : http://supportstats.hq.unity3d.com/history.php?tid=3577&site=TeamSupport