Option 2: Combining multiple links to one AWM 2/AWM 4

With this variant, you can use passive antenna splitters (SL PASC 2 or SL PASC 4) together with the AWM 2 or AWM 4 to combine the antenna signals from multiple receivers. This reduces the number of antenna cables required to a minimum.

Combining up to 2 links using the AWM 2 and the SL PASC 2

The following illustration shows an example of how to combine up to 2 links with one AWM 2 antenna wall mount. This reduces the number of antenna cables required from 4 to 2.



Combining up to 4 links using the AWM 2 and the SL PASC 4

The following illustration shows an example of how to combine up to 4 links with one AWM 2 antenna wall mount. This reduces the number of antenna cables required from 8 to 2.



Always combine all antenna sockets ANT I of all receivers and all antenna sockets ANT II of all receivers respectively to one of the two antennas of the AWM 2. If you are using only 3 of the 4 connections on the antenna splitter, you should close the unused connection with a terminating resistor (50 Ω) to minimize interfering signals and maximize transmission power.

Combining up to 8 links using the AWM 4 and two SL PASC 4 units

The following illustration shows an example of how to combine up to 8 links with one AWM 4 antenna wall mount. This reduces the number of antenna cables required from 16 to 4.



Always combine all antenna sockets ANT I of up to four receivers and all antenna sockets ANT II of up to four receivers respectively to the two sockets of one link of the AWM 4. If you are not using all connections on the antenna splitter, you should close the unused connections with a terminating resistor (50 Ω) to minimize interfering signals and maximize transmission power.

Signal loss due to extension cables and antenna splitters

In this scenario, the use of extension cables and antenna splitters with a remotely mounted antenna may result in loss of transmission power, depending on the cable length.

You can compensate this signal loss by configuring the transmission power of the receiver accordingly. Observe the following minimum transmission power settings (SL Rack Receiver DW: System Settings menu -> RF Power) for the respective cable lengths. The antenna splitter causes about as much signal loss as a cable length of 15 m. These losses must be included in the calculation of the transmission power level.

We recommend the following cable lengths in combination with the antenna splitter:

  • Receiver to splitter: 1 m -> splitter to AWM 2/4: 1 m
  • Receiver to splitter: 1 m -> splitter to AWM 2/4: 5 m
  • Receiver to splitter: 1 m -> splitter to AWM 2/4: 10 m
  • Receiver to splitter: 5 m -> splitter to AWM 2/4: 1 m
  • Receiver to splitter: 5 m -> splitter to AWM 2/4: 5 m
  • Receiver to splitter: 10 m -> splitter to AWM 2/4: 1 m
Cables longer than 10 m are not recommended for this variant.

This results in the following transmission power levels to be set in the menu of the receiver or simultaneously for all receivers in the Sennheiser Control Cockpit software:

  • 5 m cable length plus splitter -> at least level 2
  • 10 m cable length plus splitter -> at least level 3

Direct line of sight

  • If possible, position the antennas so that there is a direct line of sight (without obstacles) between the transmitters and the antennas.