So, I went ahead and added the Pyle 3.5 speakers today per Nosro's Speaker Upgrade thread.
The difference is noticeable. It's not going to sound like a 7.1 surround sound system or anything, but the audio is definitely MUCH clearer than before.
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As Nosro already documented, the hardest part by far is removing the grill, which just takes a lil time.
The three nylon nuts in the back are a 11/32" wrench. There's not enough room for a socket - ratcheting crescent wrenches will save you time here.
The three Torx secruity screws are T-15. The are NOT ordinary Torx screws; they are Torx SECURITY screws.
Once the three nylon hexnuts and the three Torx screws are out, just gently pull, and the grill should come right off.
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Note, there is a braided ground strap that comes off the far right threaded stud of the grill.
Now, here are the old speakers:
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And here is old vs new:
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Here are both mounted:
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Here is what they look like without being painted black and the grill assembly back on:
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Here, you will finally see them with the flash on:
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The female connectors are the same sizes as the speaker male spade connectors, so it is a literal plug and play job. I mounted my speakers and tested my audio before re-assembly, and they worked great.
I had to do absolutely zero modifications to anything to make this work or for re-assembly. With the correct tools, this was a 100% replacement plug and play job.
Thanks, Nosro, for the info and research on correct replacement speakers; they sound and look fantastic!