I have Apple TV and AIrplay for wireless. I bought Harmon Kardon Soundsticks iii from the Apple store online and I hooked them up. Music through iPhone, iPad or Macbook pro play as loud as I want but when I try to play movies or TV shows through Apple TV I cannot turn it up on the speakers to actually be able to hear it loud enough. I am sure I have all the settings correct on Apple TV. I am sure I know how to turn the sound up on the speakers.
I solved my own problem by reading Apple info on Apple TV it suggested hooking up a wireless keyboard through bluetooth and the keyboard has volume buttons and other buttons similar to my remote now I can turn it up as loud as I want. Im assuming I can also use my MBP since that has all the same buttons as the wireless keyboard