I have a pair of 902-8Bs on 511Bs I bought to make 2 way La scalas. I built a pair of 1st order crossovers at 650 Hz and hooked them up. They sound good if you keep the power down. At loud conversation level, bass notes make the 902s buzz like the wires of a snare drum. One is worse than the other.
What is the recommended crossover frequency and slope for the 902-8B on a 511B?
What else might cause the noise? How do I identify non-Altec diaphragms?
It's time to get serious with them. i've picked up a pair of Peavey FH1s (La Scala bass horn clones) and will be using them as sound reinforcement at church and outdoor events. I want these things to be nearly stupid-proof.
Obviously, I have work to do.