Wattage stays the same at 2,4 and 8 ohm on the Bass 400+ :wink:
I love the old Diesel 1x15 as stand alone cab, everything you (at least I) need is in there.
(no experience with the new cabs here btw)
But the Bass 400+ will stay LOUD(!), even the Bass 400 (six 6L6 or 6550) is loud as hell...