Have had a 2001rb for a couple of months now and just recently paired it with a neo 412, now I have a question, does the tweeter volume not function when the woofer volume is turned all the way down. I could not find the answer by searching or in the manual. I just want to make sure things are working correctly. The tweeter volume works fine when I have the woofer volume up, I just assumed it would act independently from the woofer volume. Also, the dirt channel seems awfully noisy, has anybody noticed this at higher gain settings?