The AP with Purepower upgrade is another subtle but noticeable improvement but again it all depends on your particular setup.
I ditched my Silverstar cable and went with the Direct Connection as I subscribe to the best cable is no cable school of thought. But the biggest wow moment I had was when I ditched my passive preamp and went direct connect from my DAC to the amp. My older recordings came so much more alive. I now use the Audirvana volume control. I figure just as in the no cable scenario, one less box to color the sound is another good deduction.
I ditched my Silverstar cable and went with the Direct Connection as I subscribe to the best cable is no cable school of thought. But the biggest wow moment I had was when I ditched my passive preamp and went direct connect from my DAC to the amp. My older recordings came so much more alive. I now use the Audirvana volume control. I figure just as in the no cable scenario, one less box to color the sound is another good deduction.