Extension Speakers - Great!

One of the best features of my 212 65 is the extension speaker output is great. I was having a problem with feedback from my single coil Tele until I plugged in an extension speaker. Now I seem to get twice the volume without the feedback - I love it! I used to own a mid 70's Fender Deluxe and the extension speaker output was weak. The Music Man is great!
Al