The LFE channel is not to have any bearing on your 2 channel music. It is a discrete information channel for Low Frequency Effects only (more BOOM!), starting at 120Hz on down. It should only be in effect if you are sending the processor a DD or DTS encoded signal that has LFE information. If you are experiencing a 10dB boost when you're not using a DD or DTS source, then there is indeed a problem in the processor/software implementation. An LFE trim adjustment of course is only for LFE information. All other routing of bass is to be at the system signal levels, i.e., same as the front speakers.