The reason why I am asking it’s because i have seen around many “rules”. Some people say subwoofer crossover should be set at F3, F3+10, 0,7*F3, 1,5*F9, from 80, etc. I guess there is no official rule that returns the best possible results with an amplifier that doesn’t have bass management. One must try.
I'd agree there is no rule whatsoever.
We actually there is my rule that runing monitors full range is a bad idea if you plan to listen loudly. High passing protects them from over excursion and that subwoofer could mask the speakers being over driven.
With many variables involved, I think somewhere between 60-100hrz is a smart High pass for a 6.5" woofer.
But If you can't HP you can't and at modest SPLs or with some beefy mains not really an issue.
With or without bass management, I generally find you ought to measure to find the best match. Listening is pointless for most folks unless you already have heard plenty of well measuring set-ups, even then measure. Use REW and a microphone and take 'moving microphone method' samples (not sweeps)of a listening window about 2feet wide by 18" tall. See what gives the best in room blend given all the variables for your space.
These include personal preferences, massive effects from distances from boundaries, boundary reinforcement, boundary interference nulls, room modes, listening position relative to speakers and boundaries, and even desired playback level as audible bass increases in perceived SPL faster than the midrange. So increasing from 80-90db is about double the perceived output in the mids but increasing from 80 to about 85/86db is perceived as about double in the bass. The right blend may be very, very different from any 'rule'.
The R200 will me brighter than the ELAC :
