Hi, I'm looking at getting another Acme speaker for my setup. I currently have one 4 ohm flatwound and would like to get another 4 ohm fullrange to put on top. These will run through a series box to let my Orange ad200b run at 8 ohms. I'm told that running 2 cabs in series can cause phasing issues if crossovers are involved. Will this setup bring phasing problems? Only one cab will have a tweeter that has a crossover. Thanks for the help.