4th order. Do they need to be separated by a baffle or do they fire into each other and work in tandem with one side wired in phase? If a brand says 3.5 sealed minimum is it ok to use 2 if the other side is ported? For 2 ssd 18's sharing 2k in iso 4th.. I have 3.5 sealed and 6 ported, the minimum recommended for each sealed and ported. Would like to keep 3.5 because it puts them at a window line.

 

Want flat response 25-65 hz.