No problem, thank you for your input/knowledge/assistance! I hope to have an opportunity to hear Sensaphonics customs at some point in my life, and I am especially interested in the active ambient due to this info on the Sensaphonics site:
"Our latest product, the 3D Active Ambient (available spring 2006), achieves the same sound quality as the 2X-S in a single-driver design. This is possible because, for the first time, we are providing our own, controlled ("active") power source to the earphone. This enables Sensaphonics engineers to specify a single, custom speaker - one not used in any other IEM product - to achieve the same performance. (We will offer a dual driver version of the 3D Active Ambient.)"
Although that might be overkill for me since I don't really need it. But it does sound intriguing!
I use the 3DAA-1 system and it sounds amazing with my nano. Having a dedicated 9V power source for the system is the key. No more sharing voltage with the program source!
Even though I'm not in a band and not a working sound engineer, I find the 3D extremely useful. Hidden benefit: With no source attached, it acts as a variable-level, flat-response earplug system. Great on airplanes and any high-noise environent. At audio trade shows like NAMM, it's great to be able to "turn down the room" at will. So when the guitar demos are endlessly pumping, I can listen at a comfortable 76 or 80 and still hear everything that's going on, including prcise localization.