Originally Posted by Infinity

So the question remains...

When the factory amp eq circuit changes based on speed and volume settings what is the result of the modification?

If you have not taken that into your calculations then your modification is not 100% on target. Not to mention the additional capacitive load you are suggesting here is at what slope?

There is more than meets the eye here and the old school fixes (while they work on some systems) will not deliver the results expected across the volume range or vehicles speeds.

Essentially if you want to weed out the bump in the response around 100 hz drop the bass control -3 and it will work, and all of the other settings in the factory EQ will work as normal.

While products such a Clean Sweep are available for adding aftermarket amplification and negates the effects of the eq, they do not take into account all of the delay and compression limiter circuits either making them minimally effective. Sure they look good at 1/3 octave RTA measurement, but that is not sufficient resolution to see the problems that are heard by people (in this case our ears are better) moving to 1/12th or better yet 1/20th of an octave measurement lets you see the problems. Additionally they do not take into account spatial averaging which is critical in ensuring that each location in the car maintains the same level and quality of sound (we should see products like these hit dealers showrooms in the next year).