After having some experience installing aftermarket speakers in a few LC's over the years, it really depends on what you're hoping to accomplish when you decide to upgrade your audio. Do you just want to replace some crackling worn-out speakers? Do you want more volume? Do you want more bass? What type of head-unit are you going to run? (in some cases, it may be all you need)
For example, I'm upgrading all the speakers in my '94 LC because I want good sound quality and I like to feel the music with some added bass. You can see in the photo how much of a difference in size there is from the factory to the after-market; with a simple speaker upgrade, most people would be happy. The speakers in the photos are the rear door speakers.
If you take the time to add some sound deadener, you'll enhance the sound in your rig just by canceling out background noise and concentrating the sound movement within the door. This is probably the easiest and most beneficial upgrade you can do with an audio upgrade. And....don't forget to put up weather/moisture barrier if you do....
Pulling a 2-strand speaker wire into the doors isn't hard, just time-consuming. Just make sure that's what you really need to do before you start getting into it. It can change an installation from a few hours to several hours or even longer depending on how you want the results to look. When you do that, you need to consider the location of the amp you want to run. You don't want to splice wire any more than absolutely necessary.
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