The equivalent to LFE+Main on my Onk is Double Bass. LFE+Main is a Denon/Marantz/Integra term.

If you set some small speakers to large, and then play a bit louder than normal, you can ignite them or destroy their spiders. That's what happened to my Dreamcatchers. Unlike Axioms, some speakers are not designed to gracefully exceed their recommended maximums.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated