I was curious about using this device to extend line level audio. What I found was that it transmits more than enough spectrum for a sub woofer, and it has a smooth roll off in the vicinity of 5 KHz or so. This is important, because you don't want it to interfere with your crossover frequencies.

So, this device isn't really suited to extend music to another line source, which is very disappointing, but it would be suited to extend voice quality audio to another room.

This could be an idea device for extending conference call audio, paging audio, to another powered speaker. If the powered speaker has a treble control, you could definitely squeeze some good speech diction out of it (the T and S sounds).

I had this SAME ISSUE and hated the popping! My fix was easy and came after trying several things. Most suggestions are to move things around (listened to all the line of sight comments, avoid other devices, moved them closer together etc), I even bought RFI filtered power strips to avoid any noise coming directly from a wall plug. Didn't do it. FINAL ANSWER IS !

If your sub has only a L/R plug and no direct sub line, then you MUST match it on the receiver end as well ! Even though my receiver has a direct sub line for some reason when I used adapters (not included) on both ends matching L/R. The popping stopped, even at super low TV sound (mainly dialogue w/no action) which was my biggest pet peeve. It would kick on/off like crazy. Mind you the wireless will still shut off the sub after about 15 seconds if no activity but you wont notice it.

After I moved everything back to my original setup, over 15 ft away, no line of sight, everything tucked away and hidden. Works great! Hope its not to late!! or maybe revisit with this approach. Best of luck!