Played a benefit tonight and my former friend in the other band offered me the use of his 100 watt Ampeg BA115. I told him that wouldn't offer enough headroom and he was welcome to use my SM400 and 2x12 cabinet. I mention to keep the 40 Hz cut, careful with the bass as well as volume. First band was fine. Second band creates a 40 minute delay. From the first note he was playing much louder than his amp was ever capable of. When my band got up the EQ was all jacked around and the volume was up high; we were both playing stock P basses. From the first note I knew there was a problem. Now I have at least one buzzing speaker. With a HPF filter or different amp this may not have happened although we did have a discussion beforehand. I have used this amp for 30 years and have never hurt a speaker nor has anyone else who has used this rig even with TL606 cabinet. So, with a 2:30 load in, getting a shortened set as the bar had other obligations, I will pay between $100 - 200 in recones. I think I'm done with letting others use my gear. Any suggestions?