It works well and maintains a reliable connection. It took many failed attempts to pair it to the subwoofer. I almost gave up but it finally connected after I tried seemingly random different sequence of activating pairing, powering on the sub, and standby mode/active mode. I just got lucky. The procedure as documented in the instruction booklet didn’t work. Minus two stars from five because I think others might not be as patient and determined and would just return the unit. Once connected (finally!) it has worked well thus far.

This works exactly the way it's suppose to work. I have the subwoofer behind my couch and this transmitter hidden behind pictures. It's so small that it can't be seen. They do not have a line of sight with each other. I had no problem pairing it. There is no delay what-so-ever. as soon as it calls for the subwoofer it works instantly and it doesn't matter how low I have the volume. It will work while watching TV. I couldn't be happier with this purchase and HIGHLY RECOMMEND.

I can't recommend the wireless solution the 10S MKII with the AT-4. The first one quit working after a couple of months. That one also was a little noisy on the headphone jack connection and it could have been the provided cable but I never swapped it out to check. The Second one that RSL was initially much better, no noise and quickly paired with the subwoofer.. unfortunately it also lost its paring after a couple of months. I contacted RSL and they were quick to point out that it was probably noise in the 2.4Ghz band that the was causing it to permanently lose it's paring. Which I don't buy. If you can't pair the transmitter from 2inches away from the subwoofer it's not a good solution. RSL's recommendation was for me to send in the device and they would test it and see if was the device or it was just my environment. However RSL didn't provide any process on how to do that or who bares the cost of shipping and handling . The other recommendation was to use SVS's triband transmitter, a $200 option. I would only recommend the Wireless if you are just trying to figure out where in the room you want to put your sub and will hardwire it later. Otherwise I would skip the frustration and just hardwire it.