i am not considering amping my stock speakers. rather, i just want to compare mine with my friend's car, which is a previous gen maxima. his rear speakers are stock, but when he turns it up, they vibrate my whole body, causing a total-body sensation to the music. the sound is not as clean as aftermarket speakers, but they are very decent for stock. compared to my stock rear ones, all mine do is hurt my ears when turned up high. no total-body sensation ;(. thats why i want to know the RMS of mine and the maxima's factory speakers.
edit: my HU puts 60x4 max watts, probably 25-30 RMS on my speakers. they sound adequate, but raspy at high volume, and when i fade all the sound to the front, it sounds horrible. when i fade to the back, its semi-decent. with no fade, its good music for factory speakers. but not nearly as good as my friend's maxima with stock speakers and stock HU.