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Perhaps the speakers have clipping protection? Power doesn't blow speakers, lack of it does. No head unit really does 40w per channel, certainly not cleanly. Its possible that you just don't have the power for the volume you want and the speaker is protecting itself?
Generally if you're going aftermarket with radios, an amp (even a cheap low-power one) is a good idea. A 40wpc amp is significantly different from a "40wpc" headunit. You'll hear the difference, and your speakers will last longer.
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1968 911L
2004 Dodge Dakota SLT Plus
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