The Sennheiser EW-D EM (S1-7) is the stationary half-rack (1/2 19-inch) digital receiver for the Evolution Wireless Digital system, used with EW-D handheld and bodypack transmitters for live sound, houses of worship, conferences, schools and theatre. This S1-7 version covers 606.2 - 662 MHz. Digital UHF transmission and the elimination of intermodulation allow channels to be placed on an equidistant 600 kHz grid, giving up to 90 channels in the 56 MHz tuning range, with auto scan to find clean frequencies quickly. The 134 dB dynamic range means input sensitivity never needs adjusting. The front-panel display shows RF and AF levels, gain, AF output and channel, and the receiver can be configured remotely via the Smart Assist app over Bluetooth Low Energy. Audio output level is up to +18 dBu, latency is 1.9 ms, and it runs from an 11 - 13 V external supply. It measures 212 x 44 x 189 mm and weighs about 1 kg; rack mounting hardware is available separately.