Nakamichi components and subwoofers are great quality products... Lexus used them in many of their top of the line models. The only Nakamichi sub I've ever heard was a 10" free air in my dad's lexus sc400 but it sounds really nice. Their speakers are awesome though... Going from my Acura Integra(CRAPPY stock speakers) to my dads Lexus, omg? Its like going from a bathroom radio to a live studio lol...
I actually swapped my Integra speakers today with the Lexus ones since my dad is in California right now for some show, and he'll never notice since he doesn't listen to music with the volume over 5.