So I have this Marshall 1960 cab that I got 2 Vintage 30's in with the stock T-75's in an X pattern. I'm not particularly fond of how T-75's sound under the mic for my stuff or how sizzly and kinda hollow the cab sounds in the room. I want to keep the cab, though, because the V30's sound fine mic'd. I want warmer and less scooped both in the room and under the mic. Is there anything to consider when mixing two kinds of speakers in a 4x12 other than sensitivity? Will there not be phase issues from mixing different speakers? Right now, I am looking at: Celestion Creambacks - My guitarist loaded a custom cab with 2 of these and I really like them in the room. I also like the clips I've heard of them mic'd. Don't know if there would be issues with them being mixed with V30's(?) Eminence Texas Heats - I like the clips I've heard of them. Smooth and dark. They sound cool in that Trivium record too. Don't know if there would be issues with them being mixed with V30's(?) Celestion Vintage 30's - Probably the safest bet is to fill it up with all V30's? Would prefer to have more different flavors to mic, though, and I really don't know if I'd consider V30's "warm" either.