Sennheiser EW-D ASA Active Antenna Splitter

The EW-D ASA is the active antenna splitter for Evolution Wireless Digital. Past about four channels, giving every receiver its own pair of whips stops working: the antennas crowd each other and the rack turns into a forest. The ASA takes one antenna pair and feeds the whole rack from it, with gain to cover the split.

It also passes DC to the receivers it feeds, so the rack runs off fewer supplies. The Q-R-S version covers the North American EW-D ranges; the CN/ANZ version is the variant for those regions.