At the risk of getting everyone all worked up again, I will relate something I learned the hard way last weekend. Sometimes a battery box is the best tool for the job. Especially with AT-853's (different from your AT-9x3s). They need all the plug-in-power voltage they can get to provide headroom for high SPLs and the battbox provides more voltage than the preamp.
Last weekend I ran AT-853s > soundpro battbox > R-09 for three sets on a rainy morning. These are "plain 2 wire AT-853s" like Soundpro sells, not the "low sensitivity mod" that Chris came up with. To make a long story short, it worked fine with a 9V battbox (I normally use a 12v battbox), which sends 9V (or 12V) right to the mics. Then just because I was bored and had too many options at hand, I decided to "improve" the situation by replacing the battbox with an ST-9100 preamp. The preamp only puts out 3.5v plug in power, and I brickwalled for the next two sets.
When using Chris's mics with Chris's preamp, it's a great combo. For my AT-853s in a quiet acoustic set where I need gain, the 9100 is great. If it's loud, I'm going to stick with my battbox. YMMV.