I have only seen one review of this and I just wanna know if I can use this with an external dac. Because from this 1 review alone and discussion on massdrop the amplifier is good however the dac is average. Because it's either I get this and a topping d50 or smsl su8 in the future together with it or a massdrop THX AAA linear AMP with a topping d50 or smsl su8. The only reason the hpa 3u+ got my attention is because compared to the massdrop amp , it is of more convenient size for me to place on my table and the single ended output is more powerful then the massdrop amp.I currently have no balanced cables I plan on using with for headphones