I get really good Bass in some songs, but it sounds like I get no bass whatsoever in other songs. Any suggestions?

The settings look good to the best of my knowledge.

What do you recommend I have the settings at?

I have 2 12" Polk GNX subs. I have One sub hooked up to one channel and the 2nd sub to the other.

I will check my settings again to make sure they are right. Any suggestions on what would be the best setup?

Thanks!

What "left" are you talking about?

Not to sound like a moron...

ZX600ti

is the model

Not sure exactly what this means and if the amp is even good. I get very mild bass (no thump really) with the AMP hooked up, but I just noticed that a red light is illuminated and it says "D106" next to it. Never used the amp before and I will be back soon with the model of the amp. Thanks!