I guess I can agree with Tvad that it is possible that the majority of your recordings are poorly recorded.
That said, there is also the possibility that you have poor AC power or a component (even wires) that is making your system sound that way.
Your mission, should you choose to accept it, is to investigate the cause. If it's a particular component, or trashy AC, those things can be addressed. If it's simply the poor quality of your recordings, you can buy some better sounding ones. If nothing is wrong then you can move to tubes or a less resolving system to help soften the harshness.
That said, there is also the possibility that you have poor AC power or a component (even wires) that is making your system sound that way.
Your mission, should you choose to accept it, is to investigate the cause. If it's a particular component, or trashy AC, those things can be addressed. If it's simply the poor quality of your recordings, you can buy some better sounding ones. If nothing is wrong then you can move to tubes or a less resolving system to help soften the harshness.