So, I was using Beyerdynamic shotguns at a DMB show last month in a PMD660. The mics require phantom power, so I was running the 660 with that switched on, and the recorder died after about 2 hours with a new set of batteries. So, I was looking at battery-powered phantom power units. The Art PhantomIIPro looks good, and the price is reasonable. What do you all think? I'm a little concerned with the added noise, but not having to worry about power would be nice. I looked into the high-capacity rechargables, but I'm not sure.