I have questions 45w x4 is that RMS or peak power? Is there any gain we can make it louder with aftermarket speakers? Or its better to add an other amp for louder music.
45W is the rated peak power. 23W is the rated RMS power, which is more than the factory head unit while remaing within the peak to peak voltage that the factory speakers are designed to handle but with improved damping factor, THD and S/N so your audio sounds good at the higher volumes. If you want to go significantly louder then yes it's better to add a higher power amplifier.
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