You would want to bypass the factory amp.
About the Alpine internal amp, well...I believe they are above average, but if you were to find a 30w x 4 V12 amp, I'm quite sure it would not fit in the HU. Saying they use the same technology as the V12 amp is a pretty generic comparison. You could argue that a Jensen amp uses the same technology as the V12.
I doubt there are too many people who could tell the difference between 15 and 30 watts from a high quality amp.
Dave
