Connecting the MS8 to factory Bose/Nav

edconline

This will likely be a lengthy post, I appreciate anyone taking the time to read and respond where they can.

First: I am changing up the audio in my Z. The system going in will be a JBL MS8 connected to a JL HD900/5, Front 2-Way components (Focal 165 KRX2), and the Wicked CAS corner box with a JL 10W3v3. No rear speakers.

What I am wondering is, where is the best place to tap into the signal from the factory nav headunit to feed the MS8? I was initially under the assumption that the factory nav would send an unprocessed, full range, low level signal to the bose amp, and there it would be processed, crossed over, and sent to the speakers. However, upon examining the bose amp connections in the FSM, it looks like the processing and crossover is being done in the HU?

If that is the case, then I would need as a minimum to wire the front tweeters, front door speakers, and subwoofer signals to the MS8 in order to achieve a full range signal, no? I have read that some people are simply taking the front L/R signal to feed a LOC, but if it is already crossed over than that LOC is missing a ton of the frequencies that it needs.

Second question is regardless of where the crossover is taking place in the factory system, how is it treating the speakers? Again, I assumed with tweeters in the front and a 6x9 in the door with 4" rear speakers, it must be using the system as a 3 way component setup. (As in not sending full signal to the rears, just treating them as mid bass drivers)

My end goal is obviously that the MS8 will give me a clean, 20-20 full range signal to send to the amp. Not a signal that has been reinterpreted to simulate a full range one, but the actual full range that the source is putting out just cleaned up. I have tried a RF 3SIXTY in the past, and I was not impressed when it was compared with an aftermarket source sending over RCA to the amp. I expect that for the price of the MS8 and all it is said to be able to do, that it will give me the same quality of sound from the factory head unit as I would be able to achieve with a high end aftermarket head unit.

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