Okay, technical answer here. Like others have said, putting an 8 ohm speaker onto a car deck will work just fine. I actuality, the car deck power supply does not have to work as hard. That JVC deck will output 22 clean watts per channel into a 4 ohm speaker. However, the deck will only be able to output 11 clean watts per channel into an 8 ohm speaker (half as much power output due to resistance, but less strain on the power supply).
That being said, the Polk Atrium are actually 3 db more efficient that those JVC marine speakers. The JVC come in at 86 db sensitivity. The Polk Altrium 4 come in at 89 db sensitivity.
It could very well be that you won't notice a volume difference here.
That being said, the Polk Atrium are actually 3 db more efficient that those JVC marine speakers. The JVC come in at 86 db sensitivity. The Polk Altrium 4 come in at 89 db sensitivity.
It could very well be that you won't notice a volume difference here.