The problems those people have had has been with mismatching speaker resistance. Most automotive speakers are 4-ohm speakers, but I believe the RF system uses 2-ohm speakers (I'm not 100% certain of this info; you would need to pull an actual speaker and see if it has the resistance labeled on it, or hook it up to a multimeter and measure the actual resistance). Lower resistance in the speakers means you get more volume with less power. If you shop around really hard, you can find 2-ohm speakers, but they'll be on the pricey side.
To be perfectly honest, the RF system's amp isn't that great. It distorts badly at about 3/4 of max volume, whereas a high quality amp won't distort at all or only above 90% of max power. If you're looking for good sound quality at higher volumes, replace the amp and the speakers.
Almost
Its the sensitivity rating of a speaker that determines how much output volume you get at an equivalent power input (typically measured at 1w from 1 meter)
The ohms is a measure of impedance (similar to resistance but not quite the same).
Using a 4 ohm speaker should work fine.. I've done it in jeeps etc a lot of the years in systems that have factory 2 ohm speakers. But typically when you increase the impedance from say 2 ohms to 4 ohms, the amp outputs half the power to that speaker.
That's why if you read most after market amp specs they'll say like 200 watts RMS @ 4 ohms, 400 watts RMS @ 2 ohms (or 350 watts at 2 ohms but you get the idea)
Typically going up in ohms won't hurt the amp, but will decrease its power output.
The issue is if the stock amp setup had 4 ohm speakers and you replace them with 2 ohm speakers. While this may increase the power output, it puts a lot more stress on the transistors and other components and can cause the amp to over heat, go into protect, etc.
So yes, replacing the stock 2 ohm RF speakers (if they are infact 2 ohms) with 4 ohms should work fine, but you may notice a decrease in volume.
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