I have purchased a new Swift VXi ABS 5 days back. I have fixed it with a Pioneer 4 Speaker Music System with a seperate 12 CD changer. This Music System was gifted to me by my close friend from USA on purchase of my car.

Could you please recommend for a good quality Subwoofer and corresponding amplifer for my system. It should be minimum a 15" one. (A 17" may also do). I want to know about their make & cost as well as a place to get them installed. I feel Sony Xplod should be the best.