Single driver speakers. Are they worth considering ?

Cube Audio complete Nenuphar speakers were out of my price range so I purchased F10 Neo drivers via Refined Audio and had  Salk Sound build the cabinets - to Cube Audio specifications. I am very happy with  the result. The first thing that hits you is the bass: it is BIG, the biggest I’ve had. The sound is very detailed and dynamic, even at low to medium listening volumes. I don’t find it fatiguing at all. When they first arrived I spent the whole night listening to various favorite albums and enjoying the newfound clarity. This set replaced Tekton Design Double Impacts which are great but came out more muted in comparison (or, using the audiophile cliche, you could say “veiled”). They never reached the lowest bass which goes down to hell with Cubes. I spent a week or two switching between DIs and Cubes. To be completely honest, I think DIs have a bit more presence in mid bass but it seemed more muddy - definitely not as punchy and satisfying as Cubes.
I am driving them with PrimaLuna Evo 300, rarely going past 1/4 of the volume. I also tried First Watt SIT-3 and found it very comparable but a tad too polite and not as engaging and alive as PrimaLuna.

SIT 1 works better than SIT3 with Nenuphars according to those that have tried both on them.

@tkukeilk Congrats!  What a great outcome. 

How much did Salk charge for the cabinet construction?  I've been thinking about building my own as well, but was just planning on buying a 12" sealed box from Dayton Audio.  And any way for us to see a picture?

A single, dynamic "full-range" driver per channel is a single point source per channel. One point source per channel is a major draw, as is the avoidance of a passive cross-over, but for a single driver to approximate anything close to full-range let alone maintain its virtues over a wider band is hardly realistic, but I may sit corrected with the representation out there and the gains of the development over the years. Pearl Acoustic speakers, among other brands, have interesting (small) single-driver-sans-XO options for the smaller listening areas and with SPL-limitations. Charney Audio, Omega speakers and Voxativ are very highly praised, and may offer a more all-out assault compared to multi-way speakers with pros and cons on both sides. A coaxial driver also acts as a single point source, though it needs a cross-over (but not necessarily as passive one) and comes with caveats in the throat area of the HF-unit here and the LF-cone to act more or less as a horn. Some coaxial drivers do come equipped with a separate horn/waveguide to load the compression driver inside. The 10" coaxial driver-equipped WLM Diva speakers sound great, I find, and mate well with lower powered tube amps. There’s also the interesting, active Geithain RL 901K speakers that fairly closely emulates a point source. And then there’s Danley Sound Labs Synergy horns that act as a true point source per channel/speaker, by summing the sound of several drivers via a shared horn. They’re high efficiency speakers intended for the pro arena, but that’s not to say the can’t sound excellent in a domestic environment. Different options here, but the SH50’s are popular among the (open-minded) audiophiles that appreciate live-like dynamics and live-like tonality and overall presentation. Mated with a pair of, say, Danley Sound Labs TH50 tapped horn subs it’s a dynamite combo that can challenge most any "high-end" speakers out there, at a much cheaper price and close to unlimited dynamic envelope to boot.