I have 515B Altec in my Voice of the Theaters, I also have a pair of 416A that I swapped out for the 515's. They are both rated less than 50 watt and are from the old tube amp era
I have tri amp my system since 2000 with an Ashly active crossover. Once you get it set correctly you rarely change any settings, occasionally I will boost or reduce the mids a little depending on the volume.