ER77

Hello everyone, I'm new to the group/site but found this site while trying to answer this question:

I have an 06' Rx400h with ML and happy to say just PAID OFF!!!
Anyway, I figured, i could send an extra payment to my local audio shop to get an upgrade since i haven't really done much to the Rx.

I was thinking of adding a small (maybe 10") sub to the audio to give it a little base with an extra 300w amp to push the sub. I have read that the ML does not have pre-amp out so i found the Audio Control Epicenter Plus, that adds pre-amps and adds lower frequency. And an added feature that i would like, an Auxiliary Input.

Almost at the question...

So can the sound processor be connected at the head unit so the auxiliary input will work or does all the sound get split up to the 3 zones so if i switch to auxiliary i will only get the aux from one zone and have to keep it set to all?

Does that make sense?

Would really appreciate any ideas/feedback.