In April of this year, I bought an Ultra-High power amp from Walter to replace my High-Power model (can't have too much power...) Anyway, I've usually set up each channel for different basses, so that I can quickly change without having to adjust the EQ, etc. I had noticed that whatever bass was plugged into Channel 1 sounded a bit better, so I set each channel completely flat and A/B'd them using the same bass. I found that Channel 1 is a bit "fuller" sounding than Channel 2. It's not that it's louder, but that Channel 2 sounds a bit thinner compared to Channel 1. It's not a huge difference, but enough that my obsessive ears could notice during my A/B. Any ideas what could cause this?