I'm trying to figure out the best settings for my system. I currently have infinity ref-5030cx component speakers up front and Infinity ref-5032cfx speakers in the rear. I do not have a sub but do have an Alpine power pack hooked up to my 4 door speakers. The power pack has HPF controls for both front and rear speakers. Should the HPF be on or off for the speakers? If on, which would be best 60Hz, 80Hz or 120Hz? Thanks in advance for any help.