I didin;t mention it, but the only upgrade I would make now would be to add 4 more Goldsound(not to be confused with Goldwood) ($139 ea) 12 inch 15mm xmax woofers, which adds a woofer array to the package.Not that I need more bass, just that the bass would have the same level of low distortion that the rest of the system has.
Marlboro