常见问题：SpeechLine Digital Wireless

For the SpeechLine Digital Wireless Series there are 5 transmitters available:
- SL Handheld DW
- SL Bodypack DW
- SL Tablestand 133-S DW (with 3 pin XLR for gooseneck mics)
- SL Tablestand 153-S DW (with 5 pin XLR gooseneck mics)
- SL Boundary 114-S DW

Depending on the regional regulations it is possible to get up to 20 microphones in one room. With the Multi-room option the channel number can be increased.

For this case SpeechLine Digital Wireless offers the possibility to adjust the transmitting power. By selecting the corresponding room size it is possible to get as many mircophones in your building as needed. To get the right and secure value the "Walk Test" can support you.

More information can be found here

SpeechLine Digital Wireless is using DECT range, which is well known from telephone market. Due to this fact the use of SpeechLine Digital Wireless is future proved and license free.

No, the 1G9 DECT range is license free.

The latency of SpeechLine is 19 ms, which is an applicable value for speech.

To connect a transmitter to a rack receiver you have to press and hold the pair button on each device until the LED starts to blink red and green. For connecting a transmitter with a SL MCR DW press the pair button of the dedicated channel in Sennheiser Control Cockpit and press and hold the pair button at the transmitter until the LED starts to blind red and green.

To make the audio connection as easy and flexible as possible we provide several options. On the SL Rack Receiver DW we are offering XLR, TRS and phone jack as audio outputs. On the SL MCR DW all channels are available digital via DANTE and thanks to the integrated auto mixer also analog by using a 3- pin Phoenix 3.81.mm connector.

The transmitter have an lithium ion battery in the delivery with which a transmitter can work up to 18h (depending on the device).

For the case that more than two SL Rack Receivers DW are needed please use the AWM 2 or AWM 4 together with our combiner SL PASC 2 or SL PASC 4.

As remote antenna the AWM 2 and AMW 4 is recommended. You can use one receiver with the AWM 2 and two receivers with the AWM 4. Together with a combiner the number of receivers can be increased. In any case additional cables are needed.

We are offering 3 different chargers: 
- CHG 2 a two bay charger for handheld and bodypack
- CHG 4N a four bay network charger for handheld and bodypack
- CHG 2W a two bay inductive charger for tablestand and boundary. 
In addition the battery BA 10 (handheld) and BA 30 (body pack) can be charged via USB.

With the Sennheiser Control Cockpit the receiver and the CHG 4N can be monitored and controlled remotely.

Yes, the receiver supports DHCP, Automatic IP and fixed IP. The Network mode can be adjusted in the receivers menu.

You can use any headset or lavalier from Sennheiser. We recommend to use the SL Headmic 1 or MKE 1.

The firmware update is done via the Sennheiser Control Cockpit Software. As soon as a receiver has been upgraded to a new firmware the update of the portable transmitter will be done automatically when paired. In addition a transmitter can be upgraded via the Sennheiser Control Cockpit Software and the the CHG 4N.

To get the maximum number of microphones it is necessary to synchronize them with each other. Therefore, a master is needed, which controls all other microphones (follower). 
If you are using SL MCR DW the Master/Follower set up is done automatically.
Please note: Any change on the Master/ Follower set up can only be done while the transmitters are switched off. 

If you are using only SL Rack Receiver DW please follow the steps below to ensure a valid Master / Follower configuration for your system: 

- Prepare and connect the antennas (if needed with AMW 4 and combiner) 
- Switch on one receiver and pair a transmitter. Wait until the LED at the receiver turns to green. This microphone will become the Master. 
- Switch on all other receivers, while the Master receiver is still on. All other microphones will become a follower automatically.

IMPORTANT: As soon as the Master / Follower configuration has been done all receivers have to be switched on at the same time e.g. via a power strip.

Yes, the connection of a transmitter to a receiver is always AES 256 encrypted. The SL MCR DW offers the possibility to use IEEE 802.1x authentication for secured network deployment.

SpeechLine Digital Wireless is using Reverse-SMA connectors due to regulatory reasons at the SL Rack Receiver DW. Sennheiser is offering RG-58 antenna cables in 1m, 5m 10m and 20m. A length higher than 20m is not recommended because the cable attenuation will be too high.

Yes, SpeechLine Digital Wireless is using the Sennheiser Sound Protocol, which can be used for programming a media control system. Furthermore, Plug-Ins for Crestron and QSC are available.

SpeechLine Digital Wireless adjusts the sensitivity at the microphone automatically to the most convenient level. That means you don't have to take care about gain anymore.

The IP address can be set manually or automatically via DHCP. Furthermore, IPv6 and mDNS is supported.

Changing the network modes can be done via Sennheiser Control Cockpit or the Dante Controller from Audinate. In Sennheiser Control Cockpit select the SL MCR DW and browse to the Network settings tab. There any network setting incl. the network mode can be changed. In Dante Controller as soon as the SL MCR DW is selected go to the “network config” tab and select the required mode in the drop-down menu. Please note: A restart of the SL MCR DW is required after changing the mode.

No, PoE is not daisy chainable. For the case a second SL MCR DW an additional PoE injector is required. The audio and network data are daisy chained.

IEEE 802.3af Class 3.

Yes, that’s possible. We recommend switching on one SL MCR DW first to ensure, that this device become a Master. Afterwards any other Receiver can be switched on and will automatically be a Follower. Depending on the regional regulations up to 20 channels in one room can be used.

The automatic mixing of all audio channels offers the possibility to use up to 4 channels of Speechline Digital Wireless even if only one input channel is left in the DSP or audio mixer. To be as flexible as possible the down mix signal is available digital via Dante as well as analog. Due to this the integration of Speechline in existing infrastructures is very easy. The audio signal is equal on both outputs, but the level can be adjusted separately in Sennheiser Control Cockpit.

The SL MCR DW is a network device and therefore the same recommendation as for any other network equipment is valid. Depending on the quality of the network cable up to 100m can be used.

Yes the SL MCR DW supports AES 67. You can activate this function by using the Dante Controller. Use the AES 67 config Tab and enable AES 67. Make sure, that the RTP Multicast address prefix is the same on any device (default: 69).

Yes, the SL MCR DW is ready to use with the Dante Domain Manager.