The Nakamichi amp should not be run at 1 ohm. Some of them fail so I wouldn't run it below 2 ohm. If your looking for SQ and you have that much power to play with I would up the budget. Its a nice...
Best thing to do is actually listen to a nicely setup system and apply the ideas to your system mate. I can go on and on about how I think you should do this and that but hearing a nice system and...
I would go with the OAX802 mate since its 1 ohm stable, much more flexibility and upgradability so your not going to need to change amps with your next upgrade.
Well the 8" VIBE sub would work but besides that, Jason's idea of fibreglass would also work very well, just attach handles and use something like the links I gave you and you should be sweet.
I would just say "responsiveness", if your really unhappy with its performance and after exhausting all other avenues you could even use a smaller subwoofer in your next setup, as a rule of thumb a...
The Option Audio gear is definitely good value for money. Most of my customers buy the higher quality European stuff from me but when someone comes to me on a budget the Option Audio gear definitely...
Could also get an electrical engineer to modify it to accept RCA outputs. I'm not sure if its possible for that specific head unit but its definitely been done.
I definitely think bluetooth is a good idea. Its better than holding the phone while driving obviously. SD would be useful if you used it. Dumb question, I know, but would you use it?