This is kind of long question. I'll give my set up and issue. For what it's worth I'm in a post-punk/indie-rock band and we play shows quite a bit. We're loud and I play a lot of feedback and heavy bass lines (post-rockish). Set up Hartke 350w 4 ohm head, Acoustic 15" cab 250w 8 ohms running parallel with a 4x10" Tubeworks cab (in the process of replacing speakers with Fender 8ohms), Big Muff pi distortion, Digitech delay, and mediocre digital multi effects pedal. Issue I went in today to have my Acoustic 15" replaced for the 3rd time. It'll play fine, then just quit and I'll get a very, very quiet distortion sound. I've also blown 3 of the 10" speakers in my other cab. I've talked to several people and no one can figure out what is going on. I keep the volume of my head at 2 1/2 and my guitar at 6 (which is still quite loud). I've replaced one of the 10" speakers with a Fender 8ohm and will probably replace the other 2 with the same. Question 1 - should I do so? (The first one sounded nice and punchy but will it last? Question 2 - Why are all my speakers blowing and has anyone had this issue with the Acoustic 15" cab? Question 3 - Should I replace the Hartke head with an Acoustic head, either the b200 or b600? Question 4 - What if I got one of the Acoustic heads and switched out my current 410 cab with the Acoustic 410 cab? Or, do you think I'll be okay with the current 410 with the new Fender speakers? Sorry the multiple questions/scenarios. I need to do something about this and I have little money to do so. I cannot for the life of me figure out why I'm having so many issues.