I wanted to know if anybody has used multiple horns with one LF driver as opposed to using one horn with multiple LF drivers which I see frequently. I ask because I was considering the arrangement of most orchestras which include only one or two tubas seated in the back as more would likely overpower the rest of the orchestra. My second reason for asking is I am planning on building a set of Altec model 19s and now have a set of 511 horns and another set of 811 horns with drivers for all 4 horns. I would build the 811s into the cabinets and mount the 511s on top so the horns would be stacked over the LF driver. I would have crossover considerations to deal with as well. Any thoughts would be appreciated.