I have an Ampeg B1RE head. It's rated at 175 watts at 8 ohms or 300 watts at 4 ohms. I had previously been using an 8 ohm cab - the Ampeg SVT-15e, which is rated at 200 watts RMS. I've been playing in a loud garage band and wanted to up my output, so I traded my cab for an Ampeg SVT 410 HLF, a 4 ohm cab rated at 500 watts RMS. I get to practice thinking I won't even have to turn my amp up halfway but once we get going I notice there's no discernable loudness difference from my old cab. Am I doing something wrong here? Is there a button or switch on the head that I'm somehow missing? I've attached an image of the back of the B1RE. Thanks in advance and sorry for the noob question!