Good idea, draggy! A little extra boost could help!

What I read in one of the ‘Connecting Combos’ links was that the 40
Well, an instrument cable from the 100's
FX Send to the 40's INPUT is
easy enough. It's
safe but you need to turn down the 40's Gain & EQ 'cause the signal is already EQ'd from the 100.

That has worked for some Rumblers, too.

True, Tim-migh, it's not spreading the power across all the speakers. But neither does the preferred FX Send to FX Return do that. But, both methods put the power where it is
appropriate! You definitely don't want to put the 100 watts into the speaker designed for the 40!!!

And, yes, the 40w is a significant addition to the 100. Just ask Goner the difference between his 100w and his 140w standalone 200 combo!
.