I just bought some Sennheiser hd650 headphones and am interested in this DAC/amp to drive them. If I use my iPod or my laptop as audio out source through the 3.5mm headphone jack on each, do I need to buy a 3.5mm to RCA splitter to connect these to this amp/DAC? Sorry for such a newbie question, but want to make sure before I buy this. Thanks!