Should I get an amp?

I installed a pioneer HU and 4 6.5" polks. I'm a little dissapointed with the sound. Just lacks depth or something. Thought about a sub then thought maybe I'm expecting too much from the Pioneer's claimed power of 50Wx4 (22Wx4 RMS). Sounded like enough to me when I bought it but would an amp greatly improve the sound? Found a good deal on a new JBL GTO504 that has 70Wx4 RMS. Should I buy and install? If so where's a good place to install in a DC?

 

do you have the high pass filter turned off on the HU? I have my HU powering my components and they sound pretty good to me. I know they would be better with an amp...but they are fine for me this way.

settings on my pioneer HU are
high pass filter- off
bass boost +2
loudness - low
high +5
Mid 0 or +1
Low +4 or +5

and the Sound retrieve button is nice sometimes too

 

i recently amped speakers i had for while and i was surprised how much better they sounded,so if they can take more then i would give them more. imo

 

Yeah it's off. I've tried many setting changes and still a little disappoined. It's better than stock just not as much as I expected. Maybe my speakers require more power from an external amp.

 

yea go for it then man. It wont hurt!

 

amping your speakers works wonders, but like keason said, my pioneer powers my speakers pretty well.

my settings are:
bass: +3
mid: +3
high: +4
sla: +4
loudness: high