Hi there,
I use Klipsch headphones and I love their quality and comfort, but I did not think that they would affect holosync effect as there is no mention about it in holosync instructions, they say that we could use any set of headphones.
These are the ones I have been using to listen to holosync and Paraliminal
http://www.klipsch.com/na-en/products/custom-1-specifications/
