Use without battery
Hello,
I am down to buying either these PXC 450's, the Sennheiser HD 650, or the HD 600. I would prefer these for their noise cancellation. My question is, Without the battery, and using an ASUS Xonar Essence ST sound card, will I be able to run these headphones noice cancellation "properly" without the use of a battery. With the phones requiring 150/750 ohms (im assuming the 750 is without battery? Please correct me if im wrong) and the sound card amp being only 600 ohms will I not be experiencing everything these phones have to offer me. The reason the HD's are in consideration is because of their 300 ohms requirment which leaves room to spare for the sound card.