Needing to replace thirty year old speakers.

Are you looking for new or used?

Adcom, blast from the past....  I serviced my old Adcoms and moved them to my Home theater... - GFA 585, GFA 5503.  I am running two tube amps now in monoblock mode - McIntosh Mc275s...   I went from Martin Logan electrostats with a separate sub-woofer to just Tower speakers.  In my case, Wilson W/P 8.  A subwoofer was not needed anymore.   So, in my opinion, if you want to get rid of your sub woofer, look for tower speakers with two woofers that are at least 8 inches, ie.  minimum 2 woofers, a mid, and a tweeter.  Note: your Canton ergo 80 are towers with two woofers and with a similar configuration I articulated, so, they should have been putting out some good bass.  So, I am not convinced that modern towers would produce enough bass for you.  You may not be able to get rid of your sub-woofer unless you go with big expensive tower speakers with more than 2 woofers.

New

I would recommend Sonus Faber… buy used… so you can get something like Olympica 3… you will be astonished at the wonderful natural, musical sound with detail over your old speakers.