This topic has been discussed before, so please do a search before posting.

To answer you question, there are no preamp outputs (RCA outputs) on the stock head unit. Also, if Nissan lists the stock at 200 Watts (I thought it was 100?) then it really means 200W total. Divide it by 4 (the tweeter is connected off of the 6 3/4" front speakers). That gives you 50W max output per channel (25 if the total is 100W). The max is about twice the continuous output (RMS) supplied to each speaker. This means that each speaker is really getting about 25W (12.5W if 100W) of power since the RMS wattage is more meaningful than the max output wattage.

I've changed out my head unit with an aftermarket Pioneer, so before you ask, I thought the sound was inadequate.

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2000 Silver Ice SE 4X4 Auto
http://albums.photopoint.com/j/AlbumIndex?u=1406935&a=10805120