Mac mini power supplies

I'm very new to computer audio and am building a system. Who's using an external power supply? How much of an improvement can one expect and what do users recommend? Thank you in advance for your comments.
I did a fair amount of research and decided on Mojo audio. Benjamin was great to do business with and I believe allows you to audition. As to how much improvement that is difficult for me to comment on because I still do not have my AQ usb cable. Two things I can comment on that make noticeable improvement are optimizing the mac and upgraded usb cables. Mojo Audio has info on optimizing the mac mini and Computer audiophile also has a lot of info/forums.

Happy building
Supplies for Mac Mini have special Requirements because of the fast changing digital load. In order to hear improvements, the supply should have very fast regulation. The Hynes supply that I will be offering soon meets this requirement. I also use the mini and will be evaluating a prototype soon. I hope to use it at the Newport Beach show May 31.

Steve N.
Empirical Audio
I have no idea how this sounds but their amps rate very well with reviewers.!accessory/conw

All the best,