So, I am running a Ampeg PF-500 with a Ampeg PR410H and jazz bass with passive pick ups. When i play at low volumes under 12o'clock on the volume and under 12o'clock on the gain the head sounds fine, but when i go over or attack really hard on the strings its sounds like it clips and cuts out sometimes it may have something like a beeping going on also, but when i turn the volumes down it goes away. The Head is 500w at 4ohm and 300 at 8ohm and cab is 600w at 8ohm. I'm not really sure what is going on with it and thought one of you guys may know. The PF-500 is new for the most part and the cab is a few years old, could the PF-500 just be to strong for the cab i had the same problem before with a Head and Cab.