Welcome! And thanks for the introduction.
My first serious loudspeakers were LS3/5a clones from the 70's. Still a believer in monitors. Assembled Hafler pre/power amp and transmission line bass kits in 1980, and commissioned single driver floor standing transmission line loudspeakers in 2004. But would never consider DIY anything audio wise, have too much respect for "real" designers like JBL, Dynaudio, and the like who have state of the art testing gear/facilities and staff with hundreds of years of experience in pushing the state of the art.
These days CD and higher quality streaming is the preferred route for convenient access to millions of albums. And active monitors are gaining popularity for their inherent advantages. Buchardt A500 is a striking example of what can be done along those lines. I've owned a couple of active 2-way monitors and greatly enjoyed them. But my commissioned loudspeakers serve me quite well, driven by compact reasonably affordable Temple Audio mono-blocks that come from the UK.