I've decided i'm going to save up for new cabs over the summer. I'm going to get a pair Avatar 1x15s, but i'd like to load them with 8-ohm JBL E-140s (I'm going with them because they're very efficient, and i'm only using a 60-watt tube head). Can somebody run the numbers through WinISD, and tell me if they'll work alright in that cab? Or will I have to build my own cabs for them? Also, if I ordered them without the tweeter, and left the hole open, would that make the tuning of the cab better or worse for the speaker?