The mismatched impedance between the speakers and the audio output drivers can cause premature failure of the audio output circuits.
I believe the 2005 and earlier had 8 ohm speakers and if you switched to 2 ohm, you will probably fry the output transformer. If the old system was 2ohm and you switched to 8 ohm, you would usually just have lower volume. Going 8 ohm on the output to 2 ohm is almost akin to shorting the output of the radio.
Do you have an amp? If so, is the impedance selectable (2, 4, 8?). Or,you could add an amp with that capability.
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