Hmmmmm, mine sounded just as good as my headunit with my laptop.
Just out of curiosity i took off the power to the monsoon box and the music still played, I thought that was odd. But when i went back in my car later (still no power to the monsoon box) i had a clicking in my speakers, turned on my laptop and no music. Plugged the power back in and its all good. Big thanks again for the write up! this works great.
Is it possible the polarity on your setup is incorrect?
Just a thought