How do you think the Stage or Premium 4 Pi 18" would do with Altec drivers and 511b horns? I am set on the Stage or Premium 4 Pi 15" or 18" to use with Altec horns and drivers. Just need to pick between 15 or 18. The smaller size of the 15" box might be better but I can make room if the 18" version has advantages.

Thanks