Since WinISD is over my head, being a dullard, I need some cab guru advice on cab improvements ( if any - maybe not ) I have a 2x10 with 2 Eminence BETA 10a's , well known here I suspect, but just in case, they're 250 watt 8 ohm, with the pair wired as a 4 ohm cab. Internal cab measurments are 560mm / 22" tall - 360mm / 14" width - 395mm / 15.5" deep Rear firing port is 95mm / 3.75" long and 95mm / 3.75" throat ( parallel , not tapered and no flare ) I'm wondering if another por