Originally Posted by grifo21
im not sure if this has been asked before or if this is a stupid question, but is running a combo amp through the line out of a head/bigger combo a bad idea?
What is the goal? Do you want to try this to boost the level or to use an additional amp, so you can cover a larger area with dispersion of the sound by using more speakers? If you just want more output, use the bigger amp. If the smaller amp's preamp does things the other one doesn't, you could use a power amp, fed signal from the line out.
Your question has no reason for doing this and it's not really possible to answer.