listen via tv speakers

While it will not support the 18Gbs 4K formats (mostly used for gamming), this device will block the CEC communication while allowing the TV’s CEC to be enabled.

So using one of them it will stop the sound coming out of the bar but you can still use the remote on all devices via CEC ? 

CEC (Consumer Electronics Control) does not transmit audio. Evidently, when your TV receives a CEC communication from BEAM, it assumes that audio should be sent to BEAM. Using the CEC blocker will prevent BEAM from communicating with the TV and the TV will continue using its internal speakers, yet continue to communicate with the other CEC devices. Unfortunately, this will also block Volume CEC commands to BEAM. You can always use a SONOS controller to adjust BEAM’s Volume or you could train BEAM to respond to IR Volume commands from one of the remotes. Don’t use the TV remote for this because it will then adjust Volume on both the TV and Beam.

Most IR remotes provide an option to control Volume on an A/V receiver. You can pick any model and train the remote and BEAM to use these Volume commands. Give the same A/V receiver model to any remote that you want to use -- except the TV remote.