OK I found more info about your amp. Indeed there is no need for a LOC if you use the high level inputs. The high level inputs are separated from the low levels. The high level inputs are on the opposite side of the RCA (low level) inputs. RCA are on the left while the high level inputs are on the right. Also you need to set the INPUT SELECT switch to BRIDGED if you use your sub amp to feed one single sub woofer