I am looking at a double or quadruple custom doorboard from Jehnert for my 2001 BMW 330i sedan. Refer to www . jehnert.de Here are my questions for those who have experience with this line. Does the quadruple system sound better than the double? How so? Does the quad system sound balanced...

As many have already pointed out the combination of the poor quality drivers that BMW use in all of their cars the extensive DSP they apply to the audio signals results in a system that is not musically engaging and for most material just sounds odd. This was going to be a quick little project...