1989 Fifth Avenue sound system advice needed.

Interior and Electrical

  1. Chris in GA

    Chris in GA New Member

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    Question for you gurus. Someone put an Infinity head unit (looks like the original radio would have but says "Infinity" on it) in my 89 Fifth. The sound is horribly weak. The speakers appear to be original with no amps on any of them.

    What is the easiest way to get good sound? Find a non-Infinity head unit, or find speakers that go with the Infinity system. Trying to keep original appearance.

    I have the dash and back package shelf out now so it will be easy to change any of it out before I put the headliner and trim back in. (Now that's another story!)

    Thanks. And...go!
     
  2. Aspen500

    Aspen500 Well-Known Member

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    The first thing would be change the speakers. The sound will be MUCH better.:)
    I put modern speakers in my Aspen and even with the original AM/FM stereo, it sounds 500% better than it did with the stock speakers. Not what you'd call good but what do you expect from 4 watts per channel, lol.
     
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  3. 89.Fifth

    89.Fifth Well-Known Member

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  4. Mikes5thAve

    Mikes5thAve Well-Known Member

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    Defiantly do the speakers. Even if they were good at some point being in a car for 30 years never helps much.
    Depending on what the radio is out of some infinity ones had external amps and other crazy stuff going on and it could be what the radio is sending out as sound itself.
     
  5. Duke5A

    Duke5A Well-Known Member

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    Some of those Infinity decks were goofy. Verify it is a 4 ohm deck before tossing speakers at it.

    As for speakers, you'll get the best results from properly enclosing the backside of the speakers. Any kind of low end response is due to this. It's impossible with the front speakers, but not with the rears. The torsion bars for the deck lid interfere, but you cam work around them. I would find 5x7 buckets for those speakers.

    If you really want to bump without losing truck space then this is what I did with a custom box and upward firing 12" sub mounted under the package tray.
     
  6. SharkHead

    SharkHead Member

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  7. SharkHead

    SharkHead Member

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    It is fairly easy to replace the rear speakers with an upgrade, this will help your sound a lot, also the head unit is easily replaced with a variety of single DIN units, I don't know too much about the front speakers but just replacing the rear speakers and the head unit will increase your sound quality greatly! I put a dual xhd7714 in mine-has HD radio reception which is another huge upgrade!
     
  8. MoparDan

    MoparDan Well-Known Member

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    The factory front speakers have very small magnets when I replaced mine the magnets on the new speakers were a lot bigger so I had to get a set of tin snips and cut the holes to make them fit, the passenger side was easy to do, but the driver's side was tricky with everything in the way
     
  9. Aspen500

    Aspen500 Well-Known Member

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    Problem I had with my front speakers was, the magnet hit the vent duct. Heat gun and reshaping a bit, and all was well. I've got the stock AM/FM stereo so it's far from great sounding but the new speakers made a noticeable improvement, even though I hardly ever use the radio in the Aspen (engine sound is all the music I need, lol!)

    I made rear speaker enclosures using foil faced "Hot Rod" insulation from Speedway Motors, and held them together with metal foil tape. Can't recall off hand how I've got them mounted to the underside of the deck though. Might be held on with more of the foil tape. It's all covered up with trunk finish panels now, or I'd run out and take a look. Anyways, they work good.
     
  10. MoparDan

    MoparDan Well-Known Member

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    Last edited: Oct 23, 2020 at 6:09 PM
  11. Aspen500

    Aspen500 Well-Known Member

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    I mounted the rear speakers under the deck and made spacers out of PVC to lower them down about 1/4", so the tweeters would clear the deck finish panel.
     
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