Thank you Matt for the response. I am going to match impedance and go with a 50w since that is close to what the original speaker was. I will also use your advice and check the rating.

                                                     Thank you again,
                                                             Brett

My question is this,

I have a Peavey pro 40 amp with a 40w speaker. I want to replace it, so do I have to find a 40w speaker or can I go a bit higher say 50w or 75w without damaging the amp or losing some sort of tone?