Wayne, how are you?Punch, no need to do anything solid below 60hZ is what got them.
Personally, the cabs in SWR's and others that entertain 4/ten config, are missing, and they put a horn in there from 3K up for the fingers.
The 8/10inch ampeg was a full system with interaction and it could do justice...well it is a sales thing.
The finest bass rig I play through lately is the main PA or my own A7 or my other cabinet which is a single 18 in a 7cuft, 3 12 inch JBL's and 311 altec horn with an Atlas driver on the back with my phase plug I built.
I never need more than 50 watts no matter. Large stage too.