Minx X201 General Input Question

Hello,

I am planning to use a Minx X201 from Cambridge Audio as my subwoofer but I have a interrogation (which is quite general to active sub I think).

Here is the backplate inputs :



If my understanding is correct, for a 5.1 system I use the LFE output from amp and go to L (LFE) on the sub. And for a stereo system, I can directly feed the L/R analog input and the sub will made a low pass filter on it according the cross frequency knob.

Now my question :

If I leave plug in L/R cable constantly and that inside my DIY amp I use a analog relay to switch between only sending LFE signal (.1) on the L input or stereo signal on the L/R. Will the sub be "smart" enough to detect when there is signal on both input and when there is only LFE signal on L ?

I hope my question is understandable 🙂

Thank you.