2 ohm speakers?
07 G35 coupe with Bose. Is it true that I can only use 2 ohm speakers throughout the car? Keeping stock HU and was keeping the stock Bose amp (for now) if this is the case, what are the best/cleanest sounding 6 1/2 or 6 3/4 separates anyone would recommend? Also do I need to buy some spacer or something? Does it make a difference if I go with 6.5 or 6 3/4 components? Thanks - Tim

You can use 4 ohm speakers but you may lose some volume compared to the factory speakers. There are some 2 ohm automotive speakers available but not many. A larger speaker will generally produce more bass so I would use a 6 3/4" if it will fit.