The Nissan Path

How can I add bass to stock sound, easily?

Is there some way to plug into head unit?

Thanks

buy a sealed powered sub ( kenwood, infinity, pioneer all make a decent one), then wire it in using a line level converter. I think the infinity will let you do it without a converter though.

That is the easiest way and the pioneer and kenwood will fit under the front seats. no extra amp needed. If you want a full higher powered system then you'll need an IDQ8 or Rockford 360.2 unit to convert all the factory signals into a usable preamp for amplifiers

Do you have links to the products/difficulty of instillation?