Originally Posted by jcn3
if the impedance of the pro jr speaker is the same then you're good. if the impedance of the pro jr speaker is higher, you're okay -- just don't go lower than what the class 5 needs.
you'll get a different vibe with the fender spkr, but you'll still get the crunch/breakup created by the amp.
sounds like a good bridge solution to me (assuming the impedances work).
Higher speaker impedance than what the amp is set at/rated for is worse then a lower load...
Some info I found about missmatching speaker/amp impedance