Originally Posted by Freddyknuckles
So that being the case should I put my sub at 100hz and my reciever at 100hz and call it a day?
That depends on what speakers you have and what you're trying to accomplish. If you have large floorstanding speaker capable of producing decent bass, then you may want to set them to "LARGE" on the receiver. Most likely your center and/or surround speakers are small though. Depending on their frequency response, you will set the crossover on the receiver accordingly. Personally I try to avoid setting it any higher than 100 Hz because bass starts to become localized above that level causing the sub to draw too much attention to itself, but it's your call, really.
Whatever you do, if you're letting your receiver manage bass, then keep the crossover on the sub set to max, not at 100 Hz.