I carry my Barbetta in the van as a back-up. If I arrive at a venue and feel that it (the venue) is too large for the Bose Compact alone, I daisy the Compact with the Barbetta. You may have to ensure that they have enough space between them (I walk off 5 to 7 paces) as to not cancel sounds and itís a good idea to plug them both into the same power source/surge protector to avoid hum. Itís easy to plug one amp on one side of a stage and the other in a separate receptacle at the other, but it may cause an annoying hum.
Ciao,
Jerry