I'm sure its the exact same thing as on powerbooks, the speaker system is in fact three speakers, two mid-high range drivers, and an extra one for more bassey sound, the trouble is the bassey one is not centered in the system, its more towards the left speaker, thus unbalancing the sound in some situatins. as such, it's nothing that can really be fixed, its that way by design limitation of cramming that much in such a thin case.