How inefficient is my Car audio system operating?

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CrispjaHoyn

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My subs are 83.1 db input sensitivity I have two of them. DVC 4 ohm. Running on a KAC-9104d at 1-ohm with greater than 900w rms on 90 db input sensitivity.

Are my subs getting 7 db more or less per watt?
What is going on?
 
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