Wayne Parham Messages: 18784 Registered: January 2001
Illuminati (33rd Degree)
The trade-off, of course, is that as you crossover the main driver lower, you increase IMD. You don't want that because it's really objectionable in the vocal range. I'd pick the crossover based on the distance between sub and main, and make sure it didn't exceed 1/4λ. That's the main thing that will affect summing between the sub and main driver.