I just purchased a Peavey 115 bx bw amp to go with my TMAX combo to get the full 500 watts. When I ordered used from ubgm I had no idea Peavey made a 4 and an 8 ohm version. I'm still learning the ohm thing but if when I get this thing it is 8 ohms instead of 4, am I gonna get less power out of it then 150W because my head is 4 ohms? From what I've read it will be less but I may have misunderstood. Hey! I was a journalism major. I don't know!