So, like the post is asking, is there any way: whether it be difficult or easy to wire the tweeters in the headrest stock speakers from I believe an 85 seat into my 1988 head unit stereo. It will be only until I figure out which aftermarket head unit I want to go with. I was also wondering which speaker position whether it be rear speakers, front speakers high/mid range etc. I would think that I can tap into and solder my wire extension from the seats to the wires that plug into the head unit.... Tell me what you guys know about the car stereo electronics for what I got. Oh and Pictures Help!
Picture of the head unit:

The drivers side wiring off the seat. Light Blue / Dark Blue Yellow / Brown

Passenger Side Wiring off the seat. Dark Blue / Light Blue Yellow / Yellow Brown Stripe

ran across this also and wanted to see if someone can explain this to me and how I can wire this into the stock speakers without having the original wiring for the front section B, C, and D.

My original Fiero, an '87, had earlier Fiero seats with the headrest speakers. The dash speakers and the rear pillar speakers were all functional as well. I re-wired it in such a manner that I balanced the impedence of the speakers... some were connected in parallel, some in series. Worked well, sounded great.

[This message has been edited by Patrick (edited 10-11-2013).]

quote Originally posted by Ponti88GT: So, like the post is asking, is there any way: whether it be difficult or easy to wire the tweeters in the headrest stock speakers from I believe an 85 seat into my 1988 head unit stereo.

I've never looked at the stock headrest speakers but I always thought they were full range 3.5" speakers with at most a whizzer cone. I did not realize they were 2 way with a tweeter on them. So from your question, it sounds like you just want to use the tweeter part?

Either way, it's pretty straight forward. Run the right and left channel speaker wires from the stereo through the center console skeleton area to the ECM area. There splice each wire to make it 2 wires. After that a + and - for right and left go to each side of the center tunnel down near the seat plug. After that it's just determining which is the right set of wires in the seat and which is the left, making sure you have the polarities correct and hooking them up.

The hard part is going to be taking the seats apart to find some way to bypass the mid in each speaker so all you get is the tweeter...

quote Originally posted by Khw: I've never looked at the stock headrest speakers but I always thought they were full range 3.5" speakers with at most a whizzer cone. I did not realize they were 2 way with a tweeter on them. So from your question, it sounds like you just want to use the tweeter part? Either way, it's pretty straight forward. Run the right and left channel speaker wires from the stereo through the center console skeleton area to the ECM area. There splice each wire to make it 2 wires. After that a + and - for right and left go to each side of the center tunnel down near the seat plug. After that it's just determining which is the right set of wires in the seat and which is the left, making sure you have the polarities correct and hooking them up. The hard part is going to be taking the seats apart to find some way to bypass the mid in each speaker so all you get is the tweeter...

The stock ones were full range, I think. But they could have been replaced at any time with 2-way speakers that fit. The trick to installing them into a later year Fiero is to not create a circuit that has a resistance lower than 8 ohms between the two seat speakers, and the rear pillar speaker, for each side, if you're going to keep the pillar speakers as well as the headrest speakers.

If your seats do have 2-way speakers, you're not going to easily bypass the full range side and get a direct line to the tweeter. If you only want tweeters in the seats, you should pull the seats apart and only install tweeters in them. The headrest speakers are really only good for the upper range anyway, due to the way they are installed in the seats, and how the seats are structured. There's no solid mounting and not enough air volume, for them to produce good quality mid-low range audio.
The pillar speakers are much better for producing quality audio.

I agree dobey. If they were replaced with aftermarket 4 ohm speakers then you need to change the wiring to run the left and right speakers in series between the 2 seats so you maintain that 8 ohm load. And yes, if all you want is tweeters there then replace them with tweeters and wire them accordingly. You will need either 4 ohm tweeters in series or 16 ohm tweeters in parallel. Of which the 4 ohm in series will probably be the easiest to achieve as 4 ohm tweeters will most likely be easier to find than 16 ohm.

[This message has been edited by Khw (edited 10-11-2013).]

What happens if you power some 4 ohm, some 8 ohm, for example off the same head unit?
Such as if you had 4 ohm speakers in the dash and 8 ohm in the pillars of Fiero?

hey guys, thanks for the replies. I am glad that the wiring is working out.

Here's the thing, I can run the wiring from the head unit/stereo just fine. Which left and right side should I use? Front or rear speaker outputs?

And this write-up keeps getting more and more technical with the ohms for each speaker setup, fronts, pillars, headrest speakers. Like the post before this, what happens if I just hook up the headrest speakers to the same wires as the rear pillar speakers? Wanting to make this work easily.

[This message has been edited by Ponti88GT (edited 10-11-2013).]

quote Originally posted by 2.5: What happens if you power some 4 ohm, some 8 ohm, for example off the same head unit? Such as if you had 4 ohm speakers in the dash and 8 ohm in the pillars of Fiero?

Not much. It depends on what the actual stable rating of the power supply (amp) in the head unit is.

Best thing to do is use external amps, and only output RCA signal from the head unit itself, turning off any internal amp it might have (most good quality aftermarket head units can do this).