What is your opinion of single driver speakers

I’m also with the direction of observations stated. Accepting a system presents only an impression of musical performance —think “illusion engine”, to borrow from Dick Olsher’s article of something like that title— then minimal is what has worked for me (Moving Iron cartridge requiring no step up, TVC, SET, and fast 8” single drivers mated sufficiently well to a cabinet (or open baffle) design and supported by a fast sub. I have had success with a handily small yet fast and potent KEF KC62 which completely transformed my previously lean listening experience. This system gives a very high level of transparency that projects the beauty of sound and detail in and around music (air and space) I value hearing most.

Not to dynamic no great bass.Ill pass.

Tried many, Overall i prefer the Cube Audio stuff  More dynamic more bass than any other drivers iv tried.

I have Closer Acoustics OGY speakers (EMS LB5 fullrange driver + transmission line the size of a cereal box) powered by a fully-restored Continental Edison PA9109 amp and I couldn't be happier. You'd expect the OGY to lack bass and sound lean/dull. That is far from the case. The bass is so fast and tight with some extension. But manage your expectations considering the size. They don't play extremely loud however, so they're ideal for a small room like mine. Most other speakers just sound veiled to me, especially for movie dialog.

I also have a REL T5x sub, but I don't think it makes a huge difference at low/moderate volumes. 

I dont understand why so many folks like single drive LS, (SDLS). It got following issues, Bass- low bass can fixing to add sub, but still missing upper bass 100-300hz- sound still weak and no full body, Whizzer cone got very poor characteristic to compare hi end Tweeter, We design all my speakers included demonstrated at CAF and NY audio show -- wide range driver with no crossover like SDLS but with accompanies one or two woofers plus high end supertweeter , If you not far from Brooklyn, we have show room working 6 days in week, no appointment need it