20006 Corolla - Speaker Upgrade - NO BASS??

#1
Hey guys, I own a 2006 corolla LE and have been looking to replace the front and back speakers in it. Nothing too crazy, just better sound. I purchased Kicker DS60 6-1/2 coaxial speakers for the front and Kicker DS693 6x9 3-way speakers for the rear. I installed the two rear speakers and the driver's side front speaker and then realized that the bass coming from them is severely lacking. The stock speakers are producing more bass than the kickers and it's noticeable. So I connected one of the 6-1/2 speakers to a home unit pushing out 120 watts per channel and the speaker only gave good bass with the bass booster on (they sounded beautiful when it was on though). Can anyone explain this?

Side note -- I installed an FM modulator in order to listen to my ipod and it needed power so spliced it into the radio power. Could this be the problem?

6-1/2 speakers: http://www.crutchfield.com/S-SUFCr5ejXgF/p_206DS60/Kicker-DS60.html

6x9 speakers: http://www.crutchfield.com/S-YrOcujOJfkA/p_206DS693/Kicker-DS693.html

FM modulator: http://www.ebay.com/itm/IS31-ISIMPLE-Wired-FM-Modulator-Universal-Auxiliary-Audio-Input-for-All-FM-Radio-/300868261699?pt=LH_DefaultDomain_0&hash=item460d255743
 
#2
Your stock stereo doesn't have to power needed to push them.
Or...I don't know much about these cars but some cars that have a premium sound system will have a 2ohm setup and putting in 4ohm cuts power down dramatically
 
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