Hi, I'm super new to this forum so any info would be great. I hooked this sub woofer up to my older Harmon Kardon AVR100 by digital audio cable(not sub cable) to LFE. I adjusted my avr settings, front speakers(small). The knob is turned to LFE, the volume is 3/4. I can hear the sub, makes a difference, but the WOW factor isn't there. I read several posts on this subject, but I'm still in the dark.