Hello! I have a GK 1001RB. The time has come to buy new cabs. I have found a cabinet that I like. Here is the issue: I can buy it used in 8ohm for cheaper. However, I would only be able to use 480 watts of the GK, that's how much wattage it puts into an 8ohm cab. Or I can buy it new at 4ohm and use all 700 watts of the GK. Both the cabs are rated at 800 watts. I won't be able to hear the difference between these two before buying. My question is this: am I likely to hear a big difference in terms of overall volume between these two cabs? I don't mean volume in terms of numbers, I understand the 4 ohms will be louder. I mean volume in terms of real life volume, on a gig? Thanks!