Help: Is this wire size OK?

Hey - I am about to swap out an amp and notice the wire size coming from my INfinity component speakers (amp and speakers installed through Best Buy). I know in my home audio equipment that wire size makes a big difference. Not sure in my truck. Take a look at this wire size and tell me if I should think of upgrading the wires when I swap out the amp (of course it will at least double the project time)

 

speaker wire looks fine but if that top wire is power i would deff. switch it out.

 

That top wire is ground. Both the ground and power are Monster 4 gauge. They are only about a year old. (the very top wire - Blue - is remote power. The red power is not visible in this shot)

 

then i would say everything looks ok.

 

I concur, everything appears as it should.