I purchased this amp to replace my factory installed Sony amp and speakers. The factory Sony units worked well but were six years old. I installed this amp and complemented it 4 rockford fosgate 6 1/2 marine speakers and a 10 inch rockford marine sub all from sonic. This is an incredible system. Clean and clear to the limit. Clear sound at 35 knots, the envy of the marina. Sonic will meet or beat any price and you will have your equipment within a few days, even if you are on the other coast as i am.