@herman, impressive horn system. What is your crossover point to from big bass horn to the next? It's a passive XO I take it from seeing just one amp.
I should put that this in the description, The mid horn rolls off naturally about 200-2Khz. Above that the tweeter has the stock avantgarde first order filter and below 200 the bass horn has a first order filter, as single inductor in series.
I have tried triamping with various electronic and digital crossovers but this is much more cohesive, simpler, and of course less expensive