I wonder how practical would it be to convert passive speakers into active? Class D amps are readily available in various sizes. The digital equalization and crossover would be tricky tho.
I did an amateur job of it as a hobby. using a MiniDSP UMIK-1, and starting with a pair of JBL Studio 630. and pair of Fosi v3 stereo. Source is MOTU Ultralite mk5 audio interface.
In addition to some basic tweeter protection, I found there was a fair bit of tweeter hiss - improved with attenuation by resistors - the power to the tweeters to match the SPL to the mid-woofers with the same amp is still WAY less. even the mid-woofer had a somewhat surprising, but in practice acceptable amount .(listening at ~2m in a small room).
Effectively tuned them for in room response. Some time-alignment was applied and seemed mostly to help with frequency response around crossover. So I guess that was a success.
Used 48db/Octave Linkwitz-Riley crossovers. All processing is done in REAPER digtal audio workstation and windows PC. All PC Audio is "loopback" through the ASIO driver of the MOTU audio interface.
I can't really comment on the "active" improvements, as too many variables, including them ending up in a different room to when they were passive. The passive version have pretty mediocre frequency response, but directivity/dispersion is good, so they seemed to make a good candidate for the "hobby". I suppose I gained some efficiency, but again, not quantified.
TL;DR If you have the means/channels to do it, and a measurement mic, could be a fun project!
That said, I'm still keen on a pair of AsciLab and may get them... Though I'd LOVE it if they sold them with 2 sets of binding posts, no passive crossover, and they supply the crossover, eq and time alignment parameters that I can implement with my own DAC, software amps etc.