I am using my Fiio BTR5 via USB out of my computer. If I plug my HD6XX directly into it I can hear music and a comfortable volume with it set to about 40 (out of 60)...and it sounds good.
If I then use my 3.5mm to RCA cable to my new THX AAA 789 "SE Input" and connect my headphones to the 3.5mm SE jack on the front, the sound is notably lower. In fact, I have to turn the volume up all the way on the BTR5 and turn the THX amp up to full volume.
Is this normal? Should I use "SE Pass"?
Or do I have a defective THX amp?