The unprotected mode... that's why I like it better perhaps. Makes sense! LOL The U16 uses Accusilicon oscillators. Anyone know a vendor that sells Accusilicon oscillators? I would like to modify my DAC if I can find the right type. I have called Accusilicon sales offices in California several times and only get a recording. Never a returned call. Just want to know where and how these oscillators can be purchased.