H Kramer, It's good to see you back and active again. I was barely around in the good ol' days when you were an integral part of the community but i do remeber fondly your famous thread about the KSC75 mod which was very cool and effective. So this is my little oppurtunity to give you somthing back in return. :)
While i can't draw a direct comparison because i never heared the SA300 but i've read several of Graphisicm's refernces to the SA5000' (Which i owned and still have a free access to) that indicate that they're obviulsly quite similiar albeit even lighter in tonal balance and possibly brighter.The K701 I had a couple of years ago (the same time with the SA5000) recabled with the Moon-Audio Black Dragon and a WA6 and the MA900 until recently driven with an objective 2 amp. same DAC as in my profile.
I assume your prefernces are mainly for Rock-based music? What are you looking to imprive from the K701? I can tell you straight away that MA900 has warmer and somewhat fuller sound than the AS-IS K701s, but while more bassy they are somwhat messy with transition from bass to mids, in comparison, and thus don't have the same kind of precision and seperation the the K701 possess, closer to the Senn approach.
I found them to be too warm and a but dark for alternative rock and metal but perform admirably nice with pop/rock and vocal singer-songwriter, They are very natural sounding with human voices, I'd say defintely moreso than SA5000/SA3000 and K701, to a lesser extent.
Edited by Amarphael - 3/22/13 at 5:56am