Try contacting PCS directly for an official response, I have a different chassis but in mine it seems not likely just by looking at where it is placed and finding a similar replacement.
Speakers in laptops are generally very hard to upgrade (I looked into when I got my Genesis IV, which are pretty terrible themselves). They are usually limited to the exact form factor they come (i.e. you can't install larger), and the sourcing of new, better speakers is difficult for consumer people as the industry isn't based around supporting the idea.