Hi all, I was previously using a Hartke HA4000 head and a 410XL cabinet. My kids decided one day that it would be fun to poke a barbeque skewer through the aluminum cones. They ruined 2 of the speakers. I replaced that cabinet with a 4.5XL and a 115XL. I finally got my speakers and hooked them up to my head. I had a few problems with the head in the past. Loose connection or something but I could usually get it to work. Here I am at home all stoked about my new speakers. I played through them with the HA4000 for about 15 minutes when the fuse blew. I replaced the fuse and they just kept blowing as soon as I turned on the juice. Since it was on it's last legs anyway I replaced it with a HA7000. I just got it today. I can't wait to get home and try it out! I just had to tell someone! Thanks for listening!