I just received my SDAC moments ago and expected to be able to connect it to my one of my laptop's USB ports and use it right away by plugging my K7XX headphones directly into the SDAC's 3.5mm jack on the back of the SDAC, while I await receipt next month of my pre-ordered Drop 02 amp. However, I see the "Setup Instructions" card that comes with the SDAC says with respect to this 3.5mm jack (referring to it both as a "connector" and a "port"), "2a. Connect to an amplifier via the 3.5mm connector. (Don't use headphones with this port.)" Just to be safe, am I correct to assume that despite the parenthetical in the foregoing instruction, it is safe to use my headphones plugged into this 3.5mm "port", when I want to use the SDAC without an amplifier, as I certainly THOUGHT was the case when I placed my order for the SDAC?