from a reverse angle.......
I used to rent a rehearsal space with a Drummer in Vancouver B.C. to practice bass'n'drums. He provided a very powerful PA for my bass(direct) and his Kick drum. One week, another local band, who was friends with my drummer used the space, and left their bass amp with him. When it was our time to rehearse again, I asked drummy if I could use their Eden Combo Bass Amp. He called their bassey and got approval.(The guy said,"Just dont blow it up....cuz if you do, you're gonna pay for it")
Well, I worked that amp out that night. I ran it at @ 75% for @ 2 hrs and it sounded Great! No problems at all. Well, A few days later I got a call from the Eden's owner. He angrily said that I broke his amp, and he wanted me to pay for it. I told him that the amp worked without a hitch, and when I shut it down I was relieved because there were no problems. He said," well....it just doesn't sound the same. I gotta turn it up to a higher level to get the same volume that i'm used to. And It sounds different now." "Different How?"I asked. "JUST DIFFERENT...I cant explain it" he shouts. He was kinda frustrated because he couldn't articulate what the audible difference was. "So it's not broken, but it sounds different? Is that what you're saying? What do you want me to do?"I asked.
"AHHHHH...F--- IT!" he shouted and hung up.
I realized that I'd probably worked his amp more than he ever had and even though I didn't 'break' his amp, I did put mileage on it. City Mileage. When I tried to compensate him, he refused, but stated that I could never use his amp(s) again.
Thus:
I dont borrow amps for rehearsals anymore, and I don't lend them either. It's like lending running shoes.
Some folks step light, but some step HEAVY.