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Yes you can. I replace my factory speakers on my 1998 Ford Expedition with Pioneers.
The rear speakers in a Toyota solara convertible, you must first remove the existing speakers by removing the cusions from the back of the seats and then accessing the main wire panel to discconect them.
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I am in the process of replacing the factory speakers in my wife's 2002 Liberty. Unfortunately, the deck does not drive the speakers, there are small amps in each of the front door speakers. Therefore, you cannot replace them with aftermarket speakers unless you replace the deck as well. The other option is to replace them, add an amp and rewire the entire system. This is not what I bargained for when I started this project but in the end it will be a lot better system then the factory system.
6.5 in front and 4x6 in back
is it a convertible? if so the onlt thing that you do is lift the flap in the corners ( with the top up of course) and there you will find the speakers. Simply undo the screws and unhook the connection. Then you put the new speakers back in the holes, attach the wires and put the screws back in.
Walmart.com and others sell a speaker spacer that should work.
3.5"-4" in the dash and 6"-6.5" in the front door. To remove factory door speakers, you will have to drill out the rivets. To replace door speakers, you will have to fabricate a spacer ring or find one to purchase (door is very shallow).
To remove The speakers you need a very simple Philips head screwdriver, that's it. First, put the convertible top about halfway down, because this allows easy access to the speaker assembly. Once the top is halfway down, look near the 1/4 windows towards the back of the car, their will be a vinyl covering that covers the speakers, this snaps off easily. Now, the speaker assembly should be revealed. carefully unscrew the speakers from the panel, or for a custom installation, unscrew the 4 or 5 screws located around the speakers central point that are in various locations, once this is done, disconnect the speaker's wire harness, the harness is located under the panel that supports connection for you tonnue cover (also know as the convertible boot or "top cover"). You can now pull the speaker out. If you have decided to remove the panel, as i have done, this is how to remove it properly. The panel should be pulled from the back, and then up, because the speaker panek built to "lock" into the fake leather (vinyl) panel located above the small armrest for backseat passengers. You can either attach the the factory wire harness to the speaker wires by soldering the positive and negative wires, or use clips to connect them, I found it was easier to use the factory harness. Now, fabricate the speakers to you liking. If you want them to be hidden, munt the speakers using factory holes, and then connect the wire harness. You now have sound. *** for custom rear fabrication of the speakers, you can remove the cloth material, and cut the perferated speaker holes out, then sand and paint the panel. this requires time and a dremel, but it really adds a custom look to your beloved little convertible. In summation, this will add a touch of customization to your car. I fabricated the speakers so they are scene and it really added a lot to my interior. I love my Chrysler Lebaron Convertible, and I hope you do to.
There is no definite time that you need to replace a convertible top. If it is properly maintained then it can last for many years.
Which speakers are you trying to replace? Front or rear?
It is a relatively easy job to replace your speakers depending on where they are located.