I get bass comming from the Klipsch RF3-II mains, RC 3-II center, and what appears to be comming from the RS3-II surrounds during the AVIA subwoofer setup test. If you are familiar with AVIA sub setup test tones, during the first level tests, it will test a main, then the sub. Is it normal to get bass from the mains and the sub at the same time with your mains set to small? *********** I did a search and found the answer AVIA intentionally carries its low bass test signals on each of the five main channels independently instead of the LFE channel for the express purpose of making main channel bass reproduction more accurate. Understanding why this is important means knowing the difference between three different concepts.