I do this right now with my Epik Valor sub which has both a single separate LFE input and 2 line level inputs (L/R).
I have a MF A5 Integrated amp with HT Direct capability with preouts which I connect to the sub's line level L/R inputs.
I connect, at the same time, the sub out from my AVR to the LFE input of the sub.
When watch movies with all that very dangerous and scary LFE stuff, the AVR sub out provides the bass managed .1 output to the sub and the MF Int Amp is put into HT Direct mode and the L/R pre-outs from the AVR only sends the high passed signals to my front speakers.
When listening to music, the AVR is turned off and my source components are connected directly the MF A5 Int Amp. The preouts from the A5 are connected to the sub's line level inputs and I use the sub's low pass controls to integrate the sub with my mains.
Works great - no cable swapping and I can have dedicated 2-channel components working in the same rig as my AVR.
I have a MF A5 Integrated amp with HT Direct capability with preouts which I connect to the sub's line level L/R inputs.
I connect, at the same time, the sub out from my AVR to the LFE input of the sub.
When watch movies with all that very dangerous and scary LFE stuff, the AVR sub out provides the bass managed .1 output to the sub and the MF Int Amp is put into HT Direct mode and the L/R pre-outs from the AVR only sends the high passed signals to my front speakers.
When listening to music, the AVR is turned off and my source components are connected directly the MF A5 Int Amp. The preouts from the A5 are connected to the sub's line level inputs and I use the sub's low pass controls to integrate the sub with my mains.
Works great - no cable swapping and I can have dedicated 2-channel components working in the same rig as my AVR.