I just received a custom cab loaded with a Faital 15PR400 woofer. The cab looks great BUT I had ordered it with a 4 ohm woofer and recieved and 8 ohm cab. The cab has a crossover and that would need to be redesigned so I can't just swap the woofer out. Don has told me that there isn't much difference in volume between the two woofers. I only plan on using this cab by itself so I don't need the 8 ohm and wanted to use my amps to their full potential. I'll probably be happy with the 8 ohm cab and in the off chance that I do someday want to use it with another cab the 8 ohms would be better. But - It's not what I ordered. What do you think? Worth it to send the cab back across country to fix this? Would there be much difference with the 4 ohm speaker?