I have looked in the owners manual and on this forum, but have found no specifications input impedance or damping factor. I will be working with a pre-amp soon, and it is recommended that the power amp have an impedance above 100k. Of course, I realize that all Decware products are designed to work with each other without issue, but in this case I am going to be experimenting with another brand of pre-amp. Any help would be appreciated.