So I went ahead and bought the Nuforce uDac2, which is awesome btw. It works great for my cans! I tried hooking it up to my subwoofer today and then tying my bookshelf speakers from the speaker outputs on the sub but I get nothing in the L/R channel, only bass through the sub. Unforuntately it seems like the subwoofer isn't powering the speaker outputs. I know on my new Bic F12 those outputs are only powered when the speaker level inputs are used, so it might be the same case here. I'm a sad panda because now I need to find a cheap amp that I can feed the uDac2 signal to.