You might could get a direct box (DI) to go inbetween the spider and the MP-1. This might make the signal more friendly for your MP-1's input. I had a similar problem with my Rockmaster preamp going into my DEQ. It's regular output was a bit hot. It also has a balanced direct out. So, I started using it, and gained a lot more headroom. DI's are fairly cheap, so that's alway's a plus.