Is it possible with all the different tips and ports to make the SA6 sound similar to the HD650? I love the sound of my HD650's and I want a portable that has similar tonality. I already have a pair of SA6's on the way, got them dirt cheap so I took a chance. I'm fairly confident that I'll be able to tune them to my liking, but I'd like some further verification on this. Has anybody heard both of these and have anything to say about them? Also, are the SA6's fairly easy to drive? This will be my first B.A. IEM, so i'm not familiar with how much power they need. My portable source is a tad on the weak side and I'd rather not have to buy and carry an amp. Thanks in advance guys,(and gals).