My HK AVR125 has a fixed 100 Hz (at least I can find no way to adjust it) subwoofer cross-over. My question is this: does it make sense to buy a sub with an adjustable x-over (e.g., the EP175 I'm considering)? It seems to me that if I set it higher than 100 Hz, it wouldn't output anything at all since the receiver will only be sending it anything < 100. And if I set it lower than 100, I would effectively be filtering anything between that setting and 100. Thanks in advance.