What would happen if one did not use the LFE on the sub ? But use the non LFE jack on the sub and set the crossover on the back of the sub to the same frequency as your bass management ? So if 80hz is your crossover frequency in your receiver, and you set the crossover on the back of the sub to 80 wouldn't the sub still be playing the same frequencies ? Not using the LFE jack on the sub . When your using LFE on your sub, can't the sub play as high as 120 ? Why would I want my sub to play to 120? Please shed some light on this