Sennheiser EW-DX SKM 21158 Handheld Digital Wireless Microphone Transmitter

Handheld transmitter, comes with mic clamp and two AA batteries (capsule and BA 70 not included!).

Stepping up your mic set-up with the latest in digital wireless
​Whether for rental companies, touring bands, theatres, worship or broadcasting – EW-DX will simplify workflows and bring an exciting feature set to any application.

Like its EW-D sister models, EW-DX offers the lowest latency on the market (1.9 milliseconds), eliminates the need for frequency calculation, and offers an ultra-wide input dynamic range of 134 dB, enabling your transmitters to handle any signal that is thrown at them. Their operating time is 12 hours with the BA 70 rechargeable battery, which will usually take you through rehearsals and the show or event itself. Operating time with standard AA batteries amounts to eight hours. Depending on the RF environment, the transmitters have a range of up to around 100 m, enough even for very generous stage layouts. 

EW-DX systems additionally benefit from an automatic multi-channel RF set-up, scalable remote control and monitoring, as well as AES-256 encryption for secure transmission of contents. The bandwidth is higher than with EW-D, up to 88 MHz, enabling more channels to be accommodated. 

Spectrum efficiency and ease of use – how it’s connected
​As part of the Evolution Wireless Digital family, EW-DX is respectful towards the valuable resource that is the RF spectrum – and takes the complexities out of wireless at the same time.

Carefully engineered, the systems do not generate any significant intermodulation products. From a spectrum efficiency point of view, this means that the microphones do not pollute the available spectrum with their own intermodulation products, hence more transmission frequencies can be used and distributed evenly at regular distances (the so-called equidistant frequency grid or tuning grid). A frequency calculation is no longer needed, making your job easier.

In standard mode – i.e. with an equidistant frequency spacing of 600 kHz – EW-DX accommodates up to 146 links within its switching bandwidth, and up to 293 frequencies in Link Density Mode (LD, at 300 kHz spacing). And the best thing? This just comes at the expense of approx. 10% of the range, so you will have the same great audio quality and transmission power in LD mode, too. 

Ready for the stage – the EW-DX transmitters
​EW-DX offers a choice of two bodypack transmitters – the EW-DX SK with a 3.5 mm jack for microphones and instrument cables, or the EW-DX SK 3-PIN for microphones with a special three-pin connector. The bodypacks can be used with any digital-proof Sennheiser clip-on and headset mic, the Neumann MCM system and digital-proof third-party microphones. The handheld microphone is also available in two versions: with a noiseless, programmable mute switch (EW-DX SKM-S) and without a switch (EW-DX SKM). The mute switch can be programmed as ‘off’, AF Mute and RF Mute – the latter enabling you to change settings inaudibly or to keep a spare mic ready for use. A wide range of 14 Sennheiser and Neumann microphone heads (standard Sennheiser capsule interface) is available for the handheld.

All transmitters feature a trim control so they can alternate on the same receiver channel – for example when multiple guitars are used – and still have the same level on the mixing desk. For guitarists and bassists who do not want to miss that typical cable sound, the EW-DX SK bodypack offers a three-step cable emulation. 

The EW-DX transmitters are the first on the market to feature e-ink displays – even when switched off, you will still be able to read off essential transmitter data. They are also fitted with an adjustable low-cut to reduce handling noise, or pop noise in a broadcasting situation. Settings are ‘off’, 30 Hz, 60 Hz, 80 Hz, 100 Hz and 120 Hz. All transmitters feature charging contacts for in-device charging of the BA 70 battery and an in-built test tone generator.

Display brightness can be adjusted, all settings locked, and – an invaluable asset in more intimate stage settings or in a broadcast environment – the green status LED of the transmitters can be turned off. 

Power to your system – accessories
​First available is a two-bay, stackable L 70 USB charger that can recharge the BA 70 batteries. This charger is also available in the EW-D charging set, complete with NT 5-20 UCW power supply unit and two BA 70 batteries. Meanwhile, the EW-D power distribution cable and matching NT 12-35 CS power supply unit will power up to four EW-DX EM 2 receivers and keep your set-up cleaner.

Control software
​To get the latest firmware updates right from the start, Sennheiser recommends downloading its free Sennheiser Control Cockpit software to a Microsoft Windows computer. Performing an immediate update to the receiver firmware ensures that you will benefit from the full functionality the system can offer.