I am enjoying HUD-mx1 -> M-stage -> K702/HD600.  But I don't know more about K550.

hello,        I am enjoying HUD-mx1 + m-stage + K702 for months. I often listen vocal, vocal jass , pop and stringed music. I would prefer HUD-mx1 and m-stage both are great entry level DAC and heandphone amp.

I see. I normally switch to onboard sound card when watching movies because I am still using XP OS.   Quote:  

I think so. I am using foobar SACD plugin and is ok for me.   Quote:  

There's great.   Would you tell me which USB Isolator and 12V LRPS diy kit you are using?  I am also planning to have a try.  

hello, I am new to head-fi. currently I want to upgrade my mx1 opamp section for my new coming AKG K702. I am wondering which selection is better for me, Matrix M-stage or OPA128SM? Thanks.