Sennheiser EW-D ASA (Q-R-S) | 4-Channel Active Antenna Splitter | 470–694 MHz RF Distribution

EW-D ASA (470 - 694 MHz) EW-D ASA  (Sennheiser 508879)

Active Antenna Splitter

The Sennheiser EW-D ASA (Q-R-S) is a professional active antenna splitter designed to distribute RF signals from a single antenna pair to multiple wireless microphone receivers. It allows up to four EW-D EM receivers to share one set of antennas while maintaining strong, reliable signal performance across large wireless systems.

Ideal for touring racks, installed audio systems, houses of worship, and live event production, the unit also provides DC power to connected receivers to reduce cable clutter and simplify rack wiring. Covering the Q, R, and S frequency ranges from 470–694 MHz, it ensures stable RF distribution for modern wireless setups.

Sennheiser EW-D ASA (Q-R-S) Competitive Differences

• Active RF distribution for up to four EW-D EM receivers using a single antenna pair
• Integrated DC power distribution reduces rack power supplies and cable clutter

Sennheiser EW-D ASA (Q-R-S) Description

The Sennheiser EW-D ASA (Q-R-S) provides a streamlined solution for expanding wireless microphone systems while maintaining strong RF performance. By receiving wireless signals from one pair of antennas and distributing them to up to four receivers, the splitter helps simplify antenna management and improve signal consistency across multiple channels.

The unit operates across the wide UHF frequency range of 470–694 MHz, supporting the Q, R, and S frequency bands used by Sennheiser EW-D systems. Built with rugged metal construction, the EW-D ASA is designed for dependable performance in demanding touring racks, broadcast setups, and permanent installations.

In addition to RF signal distribution, the splitter also supplies DC power directly to connected receivers. This feature reduces the need for multiple power adapters and helps maintain a cleaner, more organized rack setup. Each receiver connects via included BNC cables for fast integration into an EW-D wireless system.

For increased wireless range and reliability, the system can also be paired with external remote antennas such as directional or dipole antenna options. Positioning antennas closer to transmitters helps optimize RF coverage and minimize dropouts in challenging environments.

EW-D ASA Features

• Active antenna splitter for EW-D wireless microphone systems
• Supports up to four EW-D EM receivers
• Operates across Q, R, and S bands (470–694 MHz)
• Distributes RF signal from a single antenna pair
• Integrated DC power distribution for connected receivers
• Low signal loss with balanced amplification
• High RF isolation between outputs
• Durable all-metal chassis for rack systems
• Compatible with external remote antennas for extended coverage

EW-D ASA Specifications

• Frequency Range: 470–694 MHz (Q, R, S Bands)
• Antenna Splitter: 2 x 1:4 or 1 x 1:8 Active
• Amplification: 0 ± 1 dB
• Isolation (Output Connector): > 25 dB
• Reflection Loss: 10 dB (All RF Ports)
• Operating Voltage: 12 VDC
• Power Supply Input: 100–240 VAC, 50/60 Hz
• Current Consumption: Typical 210 mA
• Maximum System Current: 3 A (with 4 EW-D EM receivers)
• Supplied Power to Antenna Boosters: 12 VDC, 320 mA
• Supplied Power to Receivers (A1–A4): 12 VDC, 350 mA (Max 500 mA)
• Operating Temperature: 14 to 131°F (-10 to 55°C)
• Storage Temperature: -4 to 158°F (-20 to 70°C)
• Humidity Range: 5 to 95%
• Dimensions: 8.3 x 6.6 x 1.7 in (212 x 168 x 43 mm)
• Weight: 38.8 oz (1.1 kg)

What's In The Box

• Sennheiser EW-D ASA (Q-R-S) Active Antenna Splitter
• NT 12-35 CS Universal Power Supply
• EU, UK, and US Power Adapters
• BNC RF Connection Cables