dhodgson Some day, my son, you will too own such great gear. If you only practice that guitar 6h a day for ten years.
I hear substantial differences in sound as well on my Atc scm50asl speakers thru a cranesong avocet.
Anyway, your measurements are in accordance with my findings. The line out is a lot lower than the spdif out, meaning that with my converters ( who want a VERY loud signal and send a very loud one as well..) I have to amplify it with a line signal booster, a preamp... I also need to back the outputs by -10 plus trim about -18 to do profiling without clipping. There must be something to be done about this...