I did a bunch of MT vs. 722 comps last night. Unfortunately, I have a cold and my ears are congested..
What I did was mount my HD280 headphones on my mic baffle with the 4061's sandwiched inside.
Then I played some purely acoustic bluegrass out my computer through the UA5 to the headphones.
I recorded with the 722 at 0 db gain and at 54 db gain. That should give us a baseline from which the gain of the MT can be determined.
With the MT, I did a bunch of recordings. Line in mode at min gain, line in at max gain, medium mode at min and max gain, 5 volt supply to 4061 vs. 9 volt bbox supply to 4061, 1/4 trs input vs. 1/8, etc.
All recordings were done at 24/44.1. I'll probably dither everything to 16 and seed it on easytree.
The good news.. I discovered that line in does apparently work on my mt. Somewhow I missed that the unit had to be turned off in order for the switch to have any impact. Also, line in is not supported on the 1/8 input (as chris at soundpro suggested), somewhat contrary to the manual. It was unfortunate that m-audio support missed this detail when I spoke with them.
A big question for me is whether I can do away with my bbox and run the dpa on 5v. If so, I will build a custom low-pro 1/4" input that sucks 5v from the 1/8" input. Another option would be to use a voltage divider to knock the 30v phantom down (but that would draw more from the battery).
I haven't fully evaluated the results. But in two bbox tests, I found that the peaks using the bbox vs. the 5volt with the dpa were very close. 12 db in one case and 13 db in the other. These weren't massively loud tests (by any means) so it remains to be heard whether loud signal handling is compromised.
