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Being such a simple device, there aren't a great deal of features to talk about. The Class D amplifier inside the receiver unit musters 2 x 30W, which isn’t hugely powerful but should be enough to make surround effects audible.
The unit comes with a small remote, which provides a convenient way of changing the volume and turning the devices on or off. The credit card sized zapper is a little bit fiddly but keeps things simple with only a few blister buttons – volume up and down, on and off, mute and three buttons for switching zones.
These buttons come into play when you are streaming audio to more than one RS4 WLR receiver. Expansion kits containing a receiver and remote cost £179, and you can add up to two extra receivers. A single transmitter can feed all of the receivers but you can still control the volume and power settings of each receiver independently as they have their own controls on the front. You can switch between zones using the dedicated A, B and C buttons on the remote.
The transmitter unit features an 'Auto On' mode, which activates it when it detects an audio signal. There are two sensitivity settings for this, -50dB and -60dB, as well as an off setting. Elsewhere you can adjust the impedance to match that of your speakers. The default is 4 ohm but you can change this to 6 or 8 ohm by holding down the volume button and pressing one of the 'zone' buttons on the remote.
It’s also worth noting that the system delays the sound signal by 20ms, which could adversely affect the timing of surround effects when watching movies. You’ll need to adjust the distance or delay settings within your AV receiver to correct it.
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