Bbe who have had a 300 series with driver sub, I invested in an active filter so that my driver and my Digam Powersoft Crest CC 2800 ... the filter is superb, rendering the sound is magic ...
paufine it sound superbemebt well thanks to adjustable contour separate left right
(In the bass and treble separated!)
The sound is optimal and quite differing in outdoors or indoors, and those with BBE ... I can not do without!