Speakers aren't loud

I currently just installed a Kenwood Excelon x802-5 five channel amplifier in my car. I have 4 JL audio coaxial speakers running at 50 RMS and a Kicker sub at 500 RMS. The bass is good... but the vocals do not get as loud as the factory system did before I replaced it.
Don't get me wrong, it still gets loud. But it never gets to the point where you have to turn it down because your ears are ringing. The old system had four 20 RMS tweeters. I set all the gains with a multimeter, I have the gains set at 3/4 of the aftermarket head unit's max volume, and it is delivering the correct voltage to all speakers.
Should four 50 watt speakers be louder than this? Or do I just need more tweeters/midrange to make it louder. This is my first time installing a car audio system, so I'm not familiar with how loud these speakers should be. Any help would be greatly appreciated!
 
factory speakers usually sound more distorted giving the (false) impression of loudness.

Be sure you have no phase cancellation after installing the satellites to the woofer. Turn 1x the phase of the bass and see if it gets louder. The louder is correct as a phase cancellation always sounds more thin.
 
OEM equipment can be optimized for the power that they are going to receive and can be more efficient. Aftermarket speakers are generally going to be less efficient, especially if they're going to try to get a flat frequency response across the audio spectrum and extended (relatively) low-frequency response.
 
Should four 50 watt speakers be louder than this? Or do I just need more tweeters/midrange to make it louder. This is my first time installing a car audio system, so I'm not familiar with how loud these speakers should be. Any help would be greatly appreciated!
If the system voice is not loud enough for you i would try lowering the sub gain level.
If it is still not enough i would say adjust the response with the equalizer.
Also remember adequate soundproofing and mounting for the speakers, this cleans up the sound.
 
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