Here's the harness that will connect my modified overhead unit to the modified PAC unit:


Quick test fit before finishing installation, to make sure everything is working:

Very Nice. I hope to do this to my new Fiero, but by the looks of it that will have to wait for now.

It is very time consuming, the way I did it. Today alone was about 6 hours, just for the volume control unit. If I didn't care so much about it appearing factory it would be quicker, but I like the fact everything just plugs right in and works. So now I can easily change amps, headunits, subs, etc. and everything will just plug in.

Having the Performance Sound overhead volume control work with an aftermarket amp is great, I can easily adjust the bass to the song without messing around with the stereo equalizer and overdriving the speakers.

I am quite happy with it

What an exhorbatant waste of time. All you had to do was buy a high level to low level adapter and run an A/B switch for the high or low sound systems.

For that matter, why would you ever want to have a high quality sound system and then switch it off anyway ? The factory decks are already preprogrammed to not overload the factory speakers when turned all the way up. Did you not know that ? Wow.....you did all that work for nothing. NIce switch though.

quote Originally posted by GT Quick: What an exhorbatant waste of time. All you had to do was buy a high level to low level adapter and run an A/B switch for the high or low sound systems. For that matter, why would you ever want to have a high quality sound system and then switch it off anyway ? The factory decks are already preprogrammed to not overload the factory speakers when turned all the way up. Did you not know that ? Wow.....you did all that work for nothing. NIce switch though.

Its not a switch, its a gain control for the amplifier. The slider adjusts the gain of the Subwoofer, not the speakers. It is identical in function to the factory Performance Sound unit, many amplifiers come with a remote volume control knob, are they then pointless?

Part of the advantage is I can counteract that preprogrammed function you mention. As the volume of the stereo is turned up, the stereo reduces the bass. So I slide the slider over to boost the subwoofer.

Edit: In case you didn't notice, that is in fact a High Level to Low Level adapter.

[This message has been edited by Xanth (edited 02-10-2008).]

Ahh I get it.

Another approach would be to just use a high level input/output E/Q and run it as the preamp for the sub amplifier but wiire directly to the factory speakers. Then regardless of factory output it could be adjusted by high/mid and low frequencies. A number of audio manufacturers made these in the early 90's to resolve this exact problem. It was an active/passive unit that would have worked perfectly in this scenario.

Then yet ANOTHER aproach would be to hard wire some ohm boards that split the signals to the speakers. We use to call them "bass blockers" and they were a primitive version of the box that the 3 way speakers come with these days. Take those and hard wire them, use the outputs to go high level in/low level out and run it to the amp RCA's input. Adjust the amp volume accordingly and tweak it so that the factory EQ has enough control for good quality sound with acceptable bass.

Or if all else fails drop the dime for an aftermarket head unit and go from there.

Part of my goal is a factory appearing and functioning unit, so an aftermarket deck was not an option. I sold my Pioneer Premier and got the Delco Pontiac unit, bolts in and matches the Fiero interior and lighting.

Stock subwoofer housing, using aftermarket sub and amplifier for flexibility. The amp can easily power a larger sub should I choose to do so and will be completely hidden when I am done.

The amp has a built in crossover, so the sub receives only the low frequency. I do not want to block bass from the speakers, I want to maintain a full range of sound from them.

So I can use the equalizer on the deck to set the speakers to sound how I want, then use the volume control on the overhead to boost or turn down the subwoofer. I set the gain on the amplifier itself to set the high end, and the overhead unit adjusts within that range, using the high level to low level converter.

Keeping a stock appearance is a major part of my goal, I have to use the stock performance sound overhead and a factory stereo.

If I was willing to use an aftermarket deck, I wouldn't have to do any of this. My Excelon decks had all the features built in that I am adding to this unit. I would not be as happy with it, even though it would be greatly easier.

[This message has been edited by Xanth (edited 02-10-2008).]

I like it because it looks original but performs better. Will the Performance Sound still work if I just replace the Head Unit with one out of a Newer Pontiac. I just want a CD Player right now, I will do what you did when I have the money and drive to tackle the job.

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2002 Pontiac Grand Prix GTP- R.I.P.

1986 Pontiac Fiero GT- My Summer Fun. Mildly Modified

1989 Chevy Camaro IROC-Z- , Sold!!!

1986 Ponitac Fiero SE- Daily Driver, 100% Stock

http://www.myspace.com/craigsfierogt

Feel Free to Add Me to Your Myspace!!!!

Nice test song. Cake is awesome!! Musically and with frosting as well.

BTW: Great looking install!!!

[This message has been edited by Indyrestoguy_JR (edited 02-11-2008).]

quote Originally posted by craigsfiero2007: I like it because it looks original but performs better. Will the Performance Sound still work if I just replace the Head Unit with one out of a Newer Pontiac. I just want a CD Player right now, I will do what you did when I have the money and drive to tackle the job.

If you have the full performance sound system, I believe all you need to do for it to work with a new headunit is add a relay in to power the amplifier. The stock amplifier is already wired into the speaker harness, so its easy to swap the headunit.

quote Originally posted by Indyrestoguy_JR: Nice test song. Cake is awesome!! Musically and with frosting as well. BTW: Great looking install!!!

Thanks for the compliments

HAHA i didnt listen to the video, i just kind of skimmed through this but.. im listening to cake at the moment... haha nice .
One of those bands that never get old.

Want to keep out of archives, still not done yet

While you are at it, you might as well add some sound deadening material.

That will be included eventually, when I redo more of the interior I'll have sound deadening under the carpet and behind the seats. Planning on doing the headliner next.

Hope for updates soon, I just grabbed two of these:
http://www.partsexpress.com...241&CFTOKEN=66582162

Here they are:





Gave em a quick test, these are quite nice. Once I have them hard installed I'll get a better idea of how much power they produce.

Hey Xanth,

Looks good, I have a couple of these in my Fiero, where are you planning on installing the bass transducers?

I was thinking directly under each seat, though these are a bit taller than I expected. I would love to install them on the seat backs, but I don't see being able to install them there without chopping up the seat.

quote Originally posted by Xanth: I was thinking directly under each seat, though these are a bit taller than I expected. I would love to install them on the seat backs, but I don't see being able to install them there without chopping up the seat.

Good thinking, At first I had them on the firewall just behind the lower section of the seat back - It didn't do much.
Then I've relocated them to the metal part of the seat back (same lower back area) - It works MUCH better
No chopping needed but it leaves a "bump" in the rear seat cover (no one sees it anyway.

I would be curious to know what it would do below the seat but I would recommend installing then like I did. We usually "feel" bass in our chest and that's as close as you can get to that feeling.

One more thing, consider installing a push switch under the passenger seat that makes it work ONLY when someone seats on it, in my Fiero the passenger seat rattles a bit when I blast it, and no one is there to absorb it LOL.
I admit the seat vibrating does create a bit more bass effect, but might get annoying.

[This message has been edited by Mister (edited 04-29-2008).]

I'll probably stick them like you did then, didn't realize I could get them on the seat without harming it.

I'm hoping they help create the sensation of a much larger system, the Tang sub provides excellent bass, but is much too small to make you feel it most of the time. With these I'd like to get a great bass experience even at a low volume. My amp should be able to drive both shakers and the sub at the same time.

Interesting idea on the switch, no reason to rattle the seats apart if no one is sitting in them. Might PO my amp though

[This message has been edited by Xanth (edited 04-29-2008).]

quote Originally posted by Xanth:Might PO my amp though

Agreed, I don't think adding/removing the load of another transducer will "help" the amp or the fine tunning you'll make, I'm not big on the amp Ω calculations but it would probably effect it. I decided to keep it connected and as mentioned the additional vibrations add more to that bass feeling

I stuck mine in the same location and let me say, holy crap! I practically rattled my eyes out testing the things. They have way more oomph than I even need.

Did you do anything to secure them in place or just zip the seats back up? That's all I've done for now, still have to route the wires and get plugs for them. They don't seem to produce any real heat either, so I'm not too worried about leaving them in there.

While I was at it I finished off my PAC unit so it all snaps together:


My amp looks a mess right now, have to pull the interior back apart to re-route these new wires. I have a left and right bass shaker, and the subwoofer is bridged:

quote Originally posted by Xanth: holy crap! I practically rattled my eyes out testing the things.

LMAO...Fun Eh?

quote Originally posted by Xanth: Did you do anything to secure them in place or just zip the seats back up?[/URL]

Sure thing, to get the best effect (Thai massage feature) they must be hard mounted. I used short self tapping screws on all 4 corners. (I don't think the zipper will close)

[This message has been edited by Mister (edited 05-03-2008).]

Adding connectors onto the bass shakers:


Sizing out wires for the car:


Here's the harness from the amp to the seats:


Bass shaker in the seat, wiring harness out the bottom:


Wiring harness all in place:


Have to re-organize the amp some more, a few wires are visible now:

Your seat has a tumor. LoL! Looking great!

Very nice and clean, I'm not crazy about the Amp cover thing but that's yours to design
I'd say....TEST DRIVE TIME

I'm test-driving alright, this gets me exactly the effect I was going for. You'd never guess I've just got a 5 inch sub. Excellent too because it doesn't alert everyone outside the car to the fact there is a sound system installed.

That's the reason for the amp cover, which isn't actually finished. I've already had my cars broken into twice for audio equipment, I'm doing my best to make everything appear stock and hidden away. The amp has to be secured and the whole rear panel will be redone, so its not even a flap anymore.

I'm thinking of getting studs tack-welded in for the amp mounting tray.

[This message has been edited by Xanth (edited 05-04-2008).]

quote Originally posted by Xanth:I'm thinking of getting studs tack-welded in for the amp mounting tray.

OMG You are taking it to the extreme EH? please take pics

I thought I was going to have more to post here, but for an error on my part

Anyone need some Hi-Performance 6 X 9s or 6 1/2 speakers? https://www.fiero.nl/forum/Forum6/HTML/056517.html

Because of that small error, everything is still sitting as-is. I meant to have new speakers in place, but that will have to wait for now. I got another idea to distract me, putting touch-sensitive radio controls into the stock steering wheel. I don't want to loose the stock wheel, but would like to use the steering wheel controls that are available for my Cd-player.

Will post more info/fabrication as it develops

[This message has been edited by Xanth (edited 05-11-2008).]

Putting these in right now:



Have Kenwood 4X6s to put in the rear as well. I was originally going to do something a bit more fancy with plate speakers, but decided against it. I need more mid-low range sound, which the plates I had were incapable of providing. I'm selling the pair of Infinity 6412cfp speakers in the mall.

My current rear speakers have also started rattling like crazy, got them for free though so I got my money's worth out of them

Working on these right now:



I snapped out the grill material, made a noticeable difference in sound quality. The grill material I'm using is from PartsExpress.com , supposedly almost completely acoustically transparent.

[This message has been edited by Xanth (edited 05-30-2008).]

Great write-up so far. I really appreciate you adding the video because now I can hear what to expect with my subwoofer upgrade. Good looking speaker recovering too.

The video really doesn't do the subwoofer justice, especially now that I have the Aura Bass Shakers installed. The sound is very impressive for such small components.

Here's how the speaker grills turned out:

[This message has been edited by Xanth (edited 06-10-2008).]

That did sound real good. Do you have any more sound bytes or videos? I was thinking I would have to get a pretty big setup, but I like how this worked out, so I' might do this instead. Free bump too . Awesome job

HEY! sweet i got the same seat covers glad someone else has them too sorry couldent resist as soon as i saw them i knew what they were

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Hey just wondering what you did to mount the amp behind the seat