Love the avatar. "But there's an evil monkey in my closet, Dad!"
I really hesitate to say this (don't want to offend!), but you may want to add an outboard amp if the reciever has pre-outs, or replace the receiver. Unfortunately, Sony tends to inflate its specs quite a lot (for example, that 100 watt power rating is probably from a single channel driven, as opposed to all channels driven.) My H/K 525 rated at 70 wpc all channels driven pushes my M50s/QS4s pretty loud. I don't think I generally listen at reference levels, but I'm sure I could put it up to them and be around -10 or -5 (the receiver goes to +15).
Your old speakers were probably very efficient.
