Owned the kav500 using all five channels with 4 cls & 1 theater. If you have the five channel version and use only two channels, the toroid is not taxed at all and there seems to be more headroom. In addition, once you put aftermarket fuses on the two boards you are using, such as hifi tuning fuses, you will notice a big difference in the presence part of the soundstage. Try using the xlr too.