It is easier to attach your photos or schematics here to your reply (using the Go Advanced button) instead of over there.
Since your speakers are tiny then they will not be loud and will not produce bass frequencies.
Honestly, for how small the speakers are... They actually produce quite a bit of bass!
Im GUESSING because of how big the magnets are! and they're pretty loud as well!!!
Ill try and find some pics and maybe specs of them online!
My pc speakers are 3" with a pretty big magnet and a rubber surround. Their enclosures are pretty big. They go down to about 100Hz so deep bass frequencies are missing. Your 2.5" speakers will produce frequencies no lower than about 130Hz.