I was running a Hartke 3500 through a 4 ohm 215 cab that I had rewired to 16 ohms since the hartke is an 8 ohm amp. I found a RBI for a steal so decided to switch to a crown xls drivecore 1000. I also rewired the cab back to 4 ohms. Here's what I dont understand. The Hartke was running 350watts @8 ohms through a 16ohm cab and that setup sounded much much louder than then crown running 1100 watts bridged mono @ 4 ohms. ***??? The numbers dont make sense to me. I could never take the Hartke past 7 without feeling like the walls were going to come down. I can max out the RBI and the crown and it just seems loud. What say the experts?