@mijostyn I'm not marketing at all I don't care what anyone thinks of any of my systems (I have 4 Dolby Atmos systems in my home) I'm retired after 35 years in sound recording and mixing but I do care about what experienced people in the audiophile world think. I don't know that world so much. I do know physics and have studied all aspects of sound my entire life. This OP started by me pointing out what I thought everyone else already knew but they didn't, powered speakers are the "best practice" in building hi fidelity speakers, who cares how much they cost. Every speaker and amp manufacture who is gouging people for hundreds of thousands of dollars (my self included) for expensive systems knows that sound systems being designed synergistically are best. That is not a generalized opinion it is logical, the converse is what most everyone buys now believing that sound systems should not be designed synergistically. When someone asked how does this amp sound with this speaker now you know by reading this thread that the answer is maybe good maybe bad but it would be much better if the amp didn't have to push through the dozens of objective electronic design problems that happen when speakers and amps aren't made for each other.
One simple example other than the obvious crossover problems after the amp in the signal path is how efficient the amp can be when it is directly connect to 1 driver the needed power drops by about ½ and the throw and pull of the driver is perfectly dampened by the amplifier meaning the voice coil lasts a lot longer. It is impossible for normal voice coils to be perfectly dampened because of the unknown loads created by the crossover, connectors, speaker lines, in common in designed speaker amp combinations today.
If you say well I like tube amps, ok fine have a company design you a tube amp and a speaker in separate cabinets that are made for each other, fine. You probably can't get a company to do that today but if audiophiles would demand best practices it would happen sooner than you think. The amps are there the crossovers are there and the speakers are there make entire systems that are made for every other component. I have the PS Audio BHK components and I think they work together ok but when they finally made a speaker they didn't make an amp for it they would rather make more money and sell them separately.