The C-1 and all other condenser microphones need phantom power to operate. The BEHRINGER Xenyx mixers which have XLR ports will have phantom power, but only on the XLR ports. The 1/4 ports will not supply the phantom power. If your mixer does not have phantom power supplied in the channel, another option is to purchase a BEHRINGER Micropower PS400. This item will supply power to a condenser microphone.