I love all the incarnations of these speakers = small BBC monitors.
They work well near-field, on bookshelves or on stands out from walls, where they really shine.
There have been a few DIY/kit efforts that you can benefit from - namely Jeff Bagby's Continuum and Doug Stirling's Monacor based drop-in replacements.
The key is getting the crossover/drivers to create the 'acoustic scaling' without losing all efficiency.
Highly recommended, but better suited for 25+ high quality watts. I'm blown away that I can drive them with my Spud, though in a small room.