Not entirely sure what the problem is, but it can’t be the Klipsch. They are super-efficient and you can drive them to ear-bleeding levels with a mere 20-30 watts, if not less. I expect the problem is actually the Bose speakers. AFAIK they are decidedly inefficient, necessitated by the need to get deep bass from tiny woofers, and therefore take a lot of power to “move.”
As far as the sub, you can’t go wrong with any SVS you can afford.
Regards,
Wayne A. Pflughaupt