I have a pretty quick question that I was hoping someone would be able to answer. I have an Alpine CDA-9830 HU, Polk DB Series Satalites, and M301 Mono Amp for my Sub. I've read that setting the LPF/HPF is better in the amp, but if I set the HPF to 80 and the LPF to flat, what would I set my amp to? Any suggestions would be appreciated.