Tympany recommends it up to the break-up point, that's pushing it. I'd base the crossover point on the off-axis curves and match directivity, so depends on the tweeter. I was going to waveguide-load a Peerless BC25TG15 and see how low I could take it, shooting for around 2K. The waveguide would have been made from air-dry modeling clay, extending the existing throat of the faceplate out to 7" diameter, if I remember, about 3/4" deep. Project has been dropped due to uncertain driver availability.How far is it recommended to cross this driver?
I see measurements till 800hz, but first break up is 3000+Hz?
Thanks