You could convert the
mixer output to balanced audio for the run but that may provide no isolation, which can be a factor since it is quite common to have to run the powered speakers off a different
circuit than the
mixer. Using a DI is possible and can provide
transformer isolation but also forces you to run a
mic level signal to the speakers. You could also run the signal unbalanced and put a good input
transformer at the
speaker end, that should work just fine and also provide
transformer isolation.
I think that padding down of the signal related to doing so before the interface box, or at least prior to any circuitry in the box. You are still dealing with overloading the input of the box and possibly at a lower
level than the
speaker input, so you'd have to pad the signal prior to the DI or interface circuitry to get any benefit and that still won't
address any
clipping from the
mixer.
Unless you need the USB connectivity, the Rolls MB15b would probably be a less expensive option to the MB35. If you want something that comes more from the pro rather than consumer/MI end, look at
Henry Engineering, however the price does reflect the higher quality.
You may be paying for more than the name and reputation with the Radial Engineering AV2, there can be differences in the transformers and other components used that aren't readily apparent. Since no model was noted, I assume it is the
EWI FDB-202 being referenced. I would be interested to know what is actually in the FDB-202, you have to go to Audiopile's site to get any data on it as
EWI seems to provide no product specs or data on their web site. However, the FDB-202 would likely be quite acceptable for this application, although you'd then be dealing with
mic level signals to the speakers.
