TheRealJCole

I'm getting conflicting info . On a 7 speaker non b&o 2018 supercrew, is the front door speakers and a-pillar tweeters on seperate channels ? Or are they combined?

Is the tweeter using a capacitor for high pass filter or is it done at the headunit ?
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dhmcfadin

The tweeter is using a capacitor but I believe the split occurs at the head unit.

TheRealJCole

Thanks for the reply. So for practical purposes, can I run the front door and tweeter off a single channel from an aftermarket amp using the factory wiring ? Trying to envision how people are hooking up the small in-dash amps like the alpine PowerPack .

dhmcfadin

It's depends. Do you have the 8 inch screen/sync 3?

dhmcfadin

The reason I ask is because for the 2018's with sync 3, 8 inch headunit, the tweeters are running directly off the headunit. Now, that is how the b&o system is wired. All speakers run through the amp and the tweeters off the head unit. But, there is zero difference between the headunits b&o or not, it's the same exact sync 3, 8 inch screen which leads me to believe that just like the b&o system, the tweeters are run off the headunit. That means that you will want to sum the tweeters and mids so you are maintaining a full frequency signal. This is a large assumption but it makes sense. If it splits after the headunit, I couldn't tell you where but I do know that the split doesn't occur in the door so you would have to trace the wire back.

TheRealJCole

Yes, sync 3, 8" screen, 7 speaker setup, but not the B&o (no subwoofer)

So will I have 4 extra wires for the tweeters coming from the head unit ? My amp (kicker key180.4) has the option to run the tweeters on their own channels, bi-amped and apply high pass filters to them.

dhmcfadin

Here's how I would do it. If you aren't going to sum the channels then let the tweeters run off the factory headunit. After all, tweeters don't need a ton of power to be loud and clear. Then use your amp for your four doors.

dhmcfadin

Better speakers are going to sound better regardless.

TheRealJCole

Problem is this amp has a microphone and does auto EQ and time alignment. I was hoping to use that functionality. I could splice the front doors and tweets together at the harness to sum them but then I'd be cutting the impedance in half... I think.

dhmcfadin

That is a problem. Let me do some research and see if maybe there is a harness available.