After trying various types of wide band as a low bass- lower highs driver,,,I've just ordered something I think will put my speaker in the ball park of true full range
W18's as bass modeuales, 40hz-1200hz
DavidLouis 6.5 , 80hz-,,who knows, maybe like 12khz rolloff
and a Seas Crescendo running,,like 4khz-say,,who knows maybe 15k+ hz.
There is alot of over lap between the 3 drivers,.
For me thats ok, as long as all3 have quality musical reproduction. (= no coloration/no muddy mids/no fatigue)
Think of it as a sort of **LIne Array**
And this set up is friendly to whatever amplifer of your choice. All are 8 ohms, easy load.
I'm running a DL 4 incher, and have pretty good results. Female voice accurate.