[ChevyGuy]

The radio was tuned to match the stock speakers. Apparently that tune is the wrong thing for your new speakers.

I'm not buying into the theory that the stock unit has low output. Low output would translate into low volume. But that's not your problem. Notice that XtremeRevolution is using a DSP to re-tune the output to match the speakers he's using.

 

[ChevyGuy]

Some1 else also suggested me to get a DSP for my Cruze, but will i notice a Huge Difference in Sound Quality if I Add a DSP?

Yes, but keep in mind that the DSP is just the tool. You'll need to find someone who can use it to tune the sound system. Depending on the skill, it could sound great, or it could be horrid.