Can my headphone amp xenos 3ha be used as a preamplifier? Forgive me, I've been trying to figure this out and don't know preamps very well. I want to buy the emotiva UPA-2 2X120 Watt amplifier and it requires a preamplifier (also has no volume control button). It needs 1.2 V to be driven...

Having bought the Xenos 3HA headphone amp, I have spent an extensive time trying to tweak it to my liking. I found that the details were veiled the voices seemed unnatural etc.etc. on my HD600 refurb bought from Amazon for around $200 However, I did notice that the amp had plenty of power. So...