You have a great classic vintage british speaker that has been made in one form or another for decades any equipment upgrade will yield a great benefit with them there is no best gear with them and dollars does not mean better with them great components matter the most no matter what the type or vintage.
Is there a point of diminished returns with amps and Harbeth 30.1s?
I’m currently using Herron M1As with my 30.1s and I’ve upgraded the rest of my system (Aries/Fatboy/SUT/DL103r and Lamm pre and phono) and each upgrade has been VERY satisfying. So is it going to be worth spending $5000 or so on the used market to upgrade the Herrons? Any thoughts as to whether I’ve reached the apex of amp/speaker performace for the M30.1s?