Good to hear.
So I'm thinking these would make good satellite speakers since they are easy to position without giving up floor space. How does their frequency response compare to pre-built options? Is their lack of bass typical of satellite speakers, or a concern?
The Frequency Response (FR) curve in your enclosure seems typical of small full range driver systems. Some listening would be in order, it's really difficult to say how you would like them based on FR alone (there is a bit more with regard to measurement that tells the whole story).
With multi-way driver systems, there is an opportunity to tune the sonics via the crossover (and most professional speaker designers do tune based on ear after the theoretical Xor is applied); you won't have that option, at least to the same extent.
You can add some Xor elements to a full range (FullR) driver, that can alter FR but it kind of takes away from the reason for choosing FullR in the first place (no crossover elements make for better sonics, certain difficult to measure qualities, like "immediacy" and "realism" which FR systems tend to possess would probably be diminished).
The obvious option would be to add a sub if you feel it's necessary, but you might find they are fine as is. Note that many systems we are OK with everyday (laptops, cellphones, television built-in speakers, portables) will have similar response (and via measurement, often worse) as yours seem to be exhibiting, and they can still be satisfying.
