I ran the new monitors thru bass box pro and with the cabinet size listed and with 5 inch port and got an f3 of 39hz tuned. By itself it seems to be linear from 38hz to 5khz or 6khz ( the driver is stupid good, so it works well with all applications)i may have missed something but i am waiting to see Dennis' measurements. Sub wise there are so many that work well with the speakers, Im not sure. I was thinking that Jim could make both cabinets and a 15" sub with a cubed cabinet. Leavening the subs final specs and size to be defined. A 15" cube with the right dsp file would be sweet or 2 10"s with loading to accommodate the monitors at correct ear height.