That’s amazing. I was thinking I may too after testing out the result of this starting point. My deck can do 4x20 (55peak) so may not be necessary given your experience.That would be cool to see. All I know is that my sound system now sounds 15 times better than stock... it's not even a comparison. I had thought about getting a 5 channel amp to power the other speakers as well, but there is no way I need it.
I can hear my music loud and clear going down the highway at 70 mph with the top off and doors off.