I apologize in advance as I am a newbie (to bass) and expect this is a dumb question. I bought a bass for recording, a Peavey T40, a couple weeks ago. My 13 year old son asked if he could use it to try out for jazz band at school. I said absolutely, but you'll need an amp... So I picked up an Acoustic 260 Mini-stack (really cool!). After his first practice he mentioned that he let a buddy plug in as he did not have an amp yet. His buddy has a Squire P-Bass. So they had one bass plugged into the active and one plugged into the passive input. My questions are, could this damage the amp/cab? Does it hurt to plug an active bass into the passive or vice versa? Thanks in advance!