I have. But I wouldn't know a good replacement, and I don't have the money unless someone would want to trade their speakers for the originals out of the cab. I'd rather not, because if I ever do sell the cab, to me, it's like selling snakes oil "yeah it's a Sunn but the speakers aren't, you sure you wanna buy this" "yes, it's still a Sunn" "Ok, it's your money"