Interfacing Class-D Output w/ Hi-Z Recording Equipment

[miallen]

Hello,

I just bought a Yamaha YMC-500BL "media controller":

http://www.yamaha.com/YECDealerMedia...500sl_back.jpg

My understanding is that it's speaker outs are Class-D and it uses a TMS320 Cinema DSP chip.

I would like to interface 3 of the speaker outs (L, R and C) with a recording interface that has both TRS and XLR mic inputs.

The easiest method would of course be to create some kind of resistor network that can adjust the signal appropriately for the recording interface inputs. However I would be interested in hearing ideas about cracking the thing open and tapping into the power amp input. Yamaha is unloading these discontinued things cheap ($99 at newegg with promotion code).

I don't actually have the unit yet but as soon as I do I can look at what the speaker outs are producing under the scope and that ground is really ground and so on. Although I have no experience with signal transformers, it seems to me that a few signal transformers would work really well in this case because the ground would be isolated, the signal to the recording interface could be balanced and it would require no powered circuitry. Can someone turn me on to some cheap (~$10 USD) signal transformers that I could get from somewhere like mouser that would be appropriate for this sort of application? Or is that overkill?

Any advice is greatly appreciated.

Mike