Sennheiser EW-D SK BASE SET Digital Wireless Microphone System with Bodypack, No Mic (R4-9: 552 to 607 MHz)

The Sennheiser 508742 is a wireless microphone system that transmits a digital signal and combines an EW-D bodypack transmitter with a half-rack receiver. Because no microphone is included, you can choose the compatible Sennheiser lavalier, headworn, or instrument capsule that matches your needs.

Inside the system, 24 bit conversion and a dynamic range that reaches 134 dB preserve every detail, from the softest whisper to a loud guitar amp. Operation takes place in the R4-9 band between 552 and 607 MHz, and the UHF link stays reliable for distances up to about 330 feet when nothing blocks the line of sight.

Setup moves quickly through the Smart Assist App. Pair your phone with the receiver over Bluetooth, walk up to 120 feet away, and run frequency scans, adjust gain, or push firmware updates without touching the hardware.

For large productions, the system offers a switching bandwidth of 56 MHz, 2240 selectable frequencies, and an equidistant tuning grid that allows up to 90 channels to work at the same time without intermodulation. This flexibility makes the set a practical choice for rental inventories, multi-room conference centers, and theater productions.

Both the transmitter and the receiver sit in metal housings that cope with life on the road. Two AA batteries deliver roughly eight hours of run time, while a battery pack that can be recharged extends operation to about twelve hours. An OLED screen that provides high contrast remains readable on dark stages and in bright rehearsal rooms.

Singers who want freedom to move, presenters who need tidy cable management, and teachers who switch between classrooms will all appreciate how the EW-D platform trims complexity while keeping the renowned Sennheiser sound.

• 24 bit digital audio and a 134 dB dynamic range handle quiet passages and loud peaks without clipping
• UHF transmission covers up to 330 feet under clear line-of-sight conditions
• Smart Assist App connects through Bluetooth for fast setup and remote control at distances up to 120 feet
• Equidistant tuning grid lets up to 90 channels run together without intermodulation
• Bodypack transmitter uses a metal housing, and the receiver fits in a half rack for touring durability
• Operates for about eight hours on AA batteries, or around twelve hours with the optional rechargeable pack
• 56 MHz switching bandwidth and 2240 selectable frequencies suit crowded RF environments
• OLED screen with high contrast stays easy to read in low light
• Works with a broad range of Sennheiser lavalier, headworn, and instrument microphones that are sold separately