I blew the midrange driver on one of the Celestion Ditton speakers, I am back running the Cambers. The Cambers sound better anyway, and are way more efficient.
I also blew the Yamaha amp about the same time, I bought a Pioneer A717 integrated amp off of E bay, cheap enough. Fact: The Pioneer runs way cooler at all volume levels than the Yamaha. Subjective: The Pioneer sounds somewhat less bright than the Yamaha.....
There are sound differences between amplifiers.... The differences are not nearly as dramatic as differences between speakers. I ran both amps on both the Cambers and the Celestions, The Pioneer seemed to be able to drive the inefficient Celestions more effortlessly...
Read the details of my "listening room" above (actually, it is where I work). The room conditions explain why I do not spend more money on more expensive equipment.