So...I bought a Parasound 2250 v.2 to up the power to my Bose 901's. Everything was fine until I went for a little headphone listening session and discovered there was no more sound to be had from the headphone jack on my NAD C 326. I disconnected the amp and re-inserted jumpers from 326 pre-outs to main-ins. Sound was restored. OK, now what? Luckily, the Parasound amp has a loop output, so I connected that back to the main input on the integrated. In retrospect, I guess it was no big deal, but I was a bit worried that when I powered up after connecting amp back to integrated that sparks would fly, or worse, when I powered up. Still, seems like an odd way for NAD to do things; to provide pre-outs that bypass the headphone jack. Just glad I have my hp jack back and that nothing blew up!