Hi guys! I’ve been creeping on here for awhile now and have found many helpful threads. However, not too many threads were made for sub and amp install and the few I found weren’t really helpful instead more confusing. So I’m trying to add a sub and amp to my bose sound system 2013 G37x. I want to keep the bose subs too, is that possible?

I think I’ve figured out the wiring.
tap the positive LR and negative LR speaker wire to the subwoofer harness in the trunk and run that to my LC2i. Where would I tap my power wire for the LC2i? If I do this can I still just plug the harness back in and still get the subs from the factory bose system and my aftermarket sub and amp? Thanks!

Anybody who’s done this and can help, I am a visual learner so pictures or videos would be the best!!! Thank you!!!

 

I'll take a stab at describing what I understand about the system, though I haven't added a sub myself.

The thing is that the Bose amp has 7-channels - There's a "center" speaker in the dashboard below the rear view mirror (1). It then has two speaker outputs running to the each front door - a "woofer" signal and a "squawker / tweeter" signal - that's 4 channels for the front (5). (Since those are separate runs I'm presuming one is high-passed and one is low-passed, already been through a crossover.) Plus two more for full-range signals to the rear doors (7). The amp also does the crossover for the stock sub signal but that's a line-level output to the sub amp and speaker.

So some options... The LC2i is a processor that is expecting to see a full-range speaker input so if you got that route it would probably be best to tap into the rear door speaker outputs from the Bose amp. Remember that your sub would then follow the "fade" control in the head unit. Meaning, if you changed the "fade" control to "all front" then you'd have no signal to your sub. The first picture below shows which wires coming off your Bose amp you would need to tap if you went this way. (I'm taking this from a g37 FSM for Bose w/no NAV but I believe this part of the system is the same with or without NAV.)

Another way to go would be to tap the Bose amp's line level, already processed, mono sub signal which comes off that same plug. But you wouldn't use an LC2i in that case, just another amp and sub. Picture 2 below shows where that signal comes from.

The LC2i doesn't draw much power because it's just a processor so you might be able to tap power from pins 10/11(+) and 12/7(-). I'm not totally clear on this but it looks in the diagram like the Bose amp is switched on when the ground is connected - which seems weird so I could be reading it wrong. If that's the case then the +12 on pins 10 and 11 might always hot so ... be careful.

However, you'll need another amp to run your new sub and that means you'll want to run separate power all the way from the battery. There is not much "additional" power available in the trunk to tap off for a sub amp - which can require a lot.

There, now I've thoroughly confused you right? Sorry. You'll figure it out! There are some much better qualified folks in here who will jump in and help.

 

Yep, just blew my brain haha
Although I did learn a lot that I did not know prior so that is good, some very valuable information there. I think in this case I’m going to ditch the LOC as other threads have mentioned and make it easier for myself. I don’t know why so many YouTube videos tutorial shows that you need an LOC. Also, I forgot to mention I already have a power cable from the battery to the truck routed and a good ground. Just needed help with hooking things together.

 

Yeah, might be a couple good things about using the LC2i. I think it senses any sound coming from the radio and sends a 12v "turn-on" signal to your sub amp. That's handy because the Bose has only a 10V "turn on" signal - maybe just to mess with us? Then if you get the remote for the LC2i you can dial the sub up or down to your liking... So if you go that route, then tapping those Rear Speaker output wires from the Bose amp pins 23-26 would run to the LC2i and then the output of that processor runs to your new sub amp.

Make sense?

 

User manual for the LC2i is here:
https://www.audiocontrol.com/downloa...ser-manual.pdf
Both diagrams on the last page show a mono sub speaker but recommend connecting both speaker outputs to the processor's inputs.
We need to know if your car has NAV because that changes the pin numbers for your rear speaker outputs.
For LC2i power you should be ok tapping into the Bose harness: Pin 11 for + (should be a gray wire) and Pin 12 for - (should be black). Same with or without NAV.