Ok, I have a Gallien K 800rb head with a 4x10 Hartke Cab. The rig sounds great at moderate volume, but when I crank it up to play with my band, I get a horrible busted speaker sound. I pulled out all the speakers, and inspected them closely. The speakers are in good condition. I changed the battery in my bass, adjusted every single knob and that crappy noise still exist. Its like I cant get it loud without thinking my speakers are busted, but they are not. Is it my amp? or my cab? frustrated! p.s. no pedals, straight into the amp.