The Navi HU may have a center channel output after all.
Information about the 20-pin socket (black, for the iPod and sat radio accessories) shows pin 1 listed as 'center audio gnd' and pin 11 as 'center out'. I don't know whether it's speaker-level or line-level.
Interested in testing this?
Looking at the rear of the HU, with the socket's thumb latch at the top, pin 1 is at the far right top, and pin 11 is below that.
Remember that you'll probably need to turn on the menu option for the center channel. On the other hand, it's possible the output may always be active, and the menu option simply alters the way the audio gets mixed to all of the speakers.
Okay, I checked this out tonight. Results:
Center channel is live!
So, I first checked the wiring with a voltmeter and I could not observe any significant changes when increasing volume. I tried connecting directly to a speaker and nothing. So, I thought maybe it was a line-level output. So, I clipped on a female RCA connector then hooked it up to the amplifier. Viola, crystal clear center channel sound.
In order for it to work, you do have to turn on the center channel operation in the menu settings. I actually want to use the center channel for watching movies, not for radio or audio tracks, which sounds better in stereo mode. In fact, when turning on the center channel wihout a speaker connected to it, only surround sound signals are sent to the RF, RR, LF, an LR channels. Therefore, you lose the midrange frequencies and the voices are muted and vey difficutl to understand. Try it and you will know what i am talking about. This Navi HU uses a true 5.1 surround sound system, the same that you get in a home theater system.
So, now I have the ability to run a true 5.1 surrond sound system in the car! However, this is a project that I intend to tackle in the future. I'm off to Africa for a vaction in a couple weeks, so that takes priority.
For tonight, I spliced a 6 foot RCA cable to the proper wires so I do not have to do it in the future, in case I forget which wires do what. Also, this project will require a lot of effort to make it work. I need to purchase speakers, find best locaton to mount them (I'm leaning to the small cargo space directly in front of the transission shifter), and I will likely have to buy a new amp. I have the JL XD600/6 but 4 channels are in use with the remaining two channels bridged for the sub. I feel the subwoofer is under powered, so I will likely buy the JL XD 600/1 for the sub and connect the center channel to the two remaining channels on the 600/6. If I run two speakers, like a mid/tweeter or mid/mid then I can split that center signal and run both speakers on a 4 ohm load. If I get just one speaker then I will run it in bridged mode.
Okay, so back to the wiring. David (SVXdc) you are correct. Pin 1 (Purple, Center Channel negative) and 11 (Green, Center channel positive) on the black Ipod 20 pin connetor is the proper signal source for the center channel. It is a low voltage line-level output, so you must connect it to an amplifer. The center channel must be turned on in the Navi menu in order for it to function. I think it will work on movies as well as other input sources like the radio, sattelite, etc. but I did nt check those. I did not splice into the harness that connects to the HU. The Ipod kit has another female harness. I spliced the RCA cable into this locaton. This way it is much easier to hide that cable and it remains out of the way. My recommendation to you is to produce a wiring harness for center channel with that black male plug and a female RCA connected to the 1&11 pins. This way, if someone is using the Ipod kit, then they just snap this harness plug into the open Ipod female plug. If they do not use the Ipod kit then they can snap the harness plug directly into the back of the Navi HU.
Thanks so much for brnging this to my attention. I have been wanting to use a center channel for a long time. Only, now you just cost me a lot of money, so for this I say
Here are a couple photos on the plug and wires.
On another note, I can also watch movies from an Ipod touch on the Navi HU screena and the car seakers. I use an Ipod composite cable. I ran a video cable from the back of the Navi HU to the center console. I inserted a female RCA connector next to the 2.5mm stero jack. So now, I connect Ipod yellow cable to video jack, then I use a simple 2.5mm stereo to RCA adapter. The power usb cable from the ipod cable is connected right into the aux 12volt socket. When connected, the Navi HU will display a video source in the menu options. For those people with the three RCAs in your center console instead of the 2.5mm aux port, you just connect the Ipod composite cable right to those jacks and you are done. No adapters are required.