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4 ohm speakers are designed to operate at a higher impedance than the 2 ohm system, which can potentially lead to overpowering the amp and causing it to overheat and potentially fail. 4 ohm speakers require more power to produce the same sound level as 2 ohm speakers, which can be challenging for the amp to provide. The amp may generate more heat when driving 4 ohm speakers, which can lead to reduced lifespan and reliability.
They may work for now, but I would not use 4 ohm speakers on a stock 2 ohm system.
When the amplifier and the speakers have the same ohm rating, yes, 2 ohm speakers pull more power from the amplifier than 4 ohm because they have less resistance and allow more power to pass through. However, when you use 4 ohm speakers on a 2 ohm amp, you are also straining the amp and/or speakers.
As far as volume, you cut your volume in half when changing from 2 ohm to 4 ohm because half the power is getting to the speaker. If you are comfortable with your volume at 75% with 2 ohm speakers, then put in 4 ohm speakers, you will need to set your volume much higher to hear it at the same audible volume. Therefore, your amp is now working harder, because it has to output more power than it did with the 2 ohm speakers.
Efficiency also plays a role, which is why the higher efficiency Hertz speakers are louder than the stock junk speakers instead of being half as loud, and the Hertz have better quality as well. The speakers' efficiency allows it to make better use of the power that is being fed, so it can make more sound with less watts.
When the amplifier and the speakers have the same ohm rating, yes, 2 ohm speakers pull more power from the amplifier than 4 ohm because they have less resistance and allow more power to pass through. However, when you use 4 ohm speakers on a 2 ohm amp, you are also straining the amp and/or speakers.
As far as volume, you cut your volume in half when changing from 2 ohm to 4 ohm because half the power is getting to the speaker. If you are comfortable with your volume at 75% with 2 ohm speakers, then put in 4 ohm speakers, you will need to set your volume much higher to hear it at the same audible volume. Therefore, your amp is now working harder, because it has to output more power than it did with the 2 ohm speakers.
Efficiency also plays a role, which is why the higher efficiency Hertz speakers are louder than the stock junk speakers instead of being half as loud, and the Hertz have better quality as well. The speakers' efficiency allows it to make better use of the power that is being fed, so it can make more sound with less watts.
Just for reference from the article you linked:
Thank you again for the explanation, I didn't read that line. Yet even hertz wrote me that (I translate from Italian):
Regarding what is required, there is no risk of damage or overloading of the amplifier in case a speaker with a higher impedance than the original 2ohm is used as in the specific case indeed, the same could work in a more "relaxed" way since the amplifier will provide less power in view of the load applied.
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