what i did last few days:
step 1: change from rca to balance cable ( Silver Sonic Air Matrix)
impressions : more noticable refinement. more details, wider soundstage,
downside is harsh high. edged bass, brighter.
comment: uncomfortable listening at mid and high.
step 2: got the above impression, then go to step 2 to make change
add a platinum fuse to diy power cord which gives power to headamp, dac and transport. add a ground cable attached to transport.
impression: overall picture is full of meat, feel like analog listen.
but downside is still harsh high and a little brighter. improve a lot but still
not so comfortable.
step 3 \; got the above impression, then go to step 3
change dac 83 to Furutech platinum fuse - above harsh high, brighter sound signature are gone.
and looks like give you back darkness and analog impression.
and this mod were helped by my 2 friends .
and 3 of us all agreed bass is much better than mod-before. more meat ,
and this bass should only be found out at hi-end equipment that my
system now can give out.