Greetings, I'm considering replacing the stock speaker (18") in my Carvin cab. The Carvin is paired with an Epifani UL-410 cab. Epifani sounds great but Carvin sounds "slow" and dull (I suspect I should expect that out of an 18" but to that extent?). Playing through Carvin alone also sounds very drab. Carvin speaker rated for 600 watts (I tbelieve). Will want a speaker capable of 600 watts minimum to replace it. Don't mind sheeling out the bucks for good quality. Any recommendations??? Has anyone else out there in TB land replaced a Carvin 18". Thanks in advance for any feedback.