BSS London BLU 80-1204-C 4 Channel Analog Output Card

The Soundweb London Analog Input and Analog Output Cards are designed to populate any of the four card slots on Soundweb London BLU-800, BLU-320, BLU-160, BLU-120, BLU-80, BLU-32 and BLU-16 devices. These analog cards enable Soundweb London devices to send line level signals and receive microphone / line level signals.

eBay