Josh,
“I’m going to defer to Chedwin’s (Josh’s) advice here.”
And now you see why.
I agree that the 15 would be the only one to possibly consider. But at just $300 (in quantity) for the drivers alone, you could find something similar with warranty and support at a comparable price once you add in all the other bits and pieces, not to mention the amps truly required. Plus, a consultation from a local professional in the field would be invaluable.
Yes, it would be a great achievement to say we built this by ourselves from the ground up, but sometimes it’s the long term view you need to see, especially if the initial people involved become un-involved for any reason.
