This is where most compressed versions fail. To save space, audio is often converted to or a very low bitrate. The sweeping orchestral score sounds "tinny" or muffled.
These ISOs are notoriously finicky. Because data has been shifted to accommodate compression, you may encounter "Black Screen" bugs or crashes during specific level loads (especially the Icarus or Phoenix sequences). Hardware (OPL/FreeMcBoot): god of war 2 highly compressed ps2 iso
Even with a highly compressed ISO, you may encounter issues: This is where most compressed versions fail