@orenm145 I concur with many others that have already stated that the amp is not the problem
In the interest of problem isolation, if you have not already done so, may I suggest you simply your build for a moment and validate the source of the problem
Take the PC and network out of the equation
What happens when you play the tuner, are you happy with the bass?
If so move up the food chain and connect an external CD player to the Yamaha and test
Those two tests should confirm if the amp is part of the problem
Best of luck