I have the XD and an X2 head. I replaced the XD with a Jensen C10Q and it really didn't change the sound that much so back in with the stock speaker. I also bought the Kustom cab for $85 and replaced the speaker with a Jensen Mod 12-50. That was an improvement and a keeper. I run my X2 through a Blackstar 2x12 cab that has Celestion 70-80's which are still not broken in and it sounds good. I guess what I am saying is I wouldn't change out the speaker on the XD unless you go up to a 15" like Wayne. Then you will see some huge differences.