I have been using high quality 2x12" setups for a LONG time: Aguilar GS112, GS212, db112, db212, SL112...... but a single Barefaced BigBaby2 is 99% there IMHO.
Let's say, I need something with a bit more headroom.
As the LM800 does have a different power amp design and sounds different. It is not quite an option.