I play a regular monthly gig in a room where my AI cab sounded kind of thin, based on recordings, so I added a EA M-Line Wizzy 12. I drive both the AI and EA with an AI head that I place near me so I can tweak my volume if need be. I don't usually use the EA cab but for some room it *fattens* up the sound just as you asked about.
.......... Tom Lane
Ignorance is only stupidity when it's a chosen state.