Sound Devices A20-Nexus Go 4-Channel Digital Wireless ReceiverThe A20 Nexus Go true diversity wireless receiver was made with portability in mind. It comes with four receiver channels, and can be expanded to six and eight channels via software license, without additional hardware. Need to transition to a rack or cart? The A20 Nexus Go receivers half unit size will save you space there, too. Its ready for anything. The A20 Nexus Go receiver utilizes the unparalleled SpectraBand tuning range of 169 1525 MHz,