Turn on 
		HTC BoomSound with 
		Dolby Audio and put on your headphones to enjoy refined audio details in a more personal way. 
	 
 
  
 
	 -  
		  From the 
				Home screen, tap 
				 , and then find and tap 
				Settings. , and then find and tap 
				Settings.
-  
		  Plug your headphones into the headphone jack. 
		   
		
-  
		  Tap the 
			 HTC BoomSound with Dolby Audio 
			 On/Off switch. 
		   
		
-  
		  Tap 
			 HTC BoomSound with Dolby Audio, and then select an option from the 
			 Choose your headphones screen. 
			  HTC One M9(s) remembers the headphone profile you chose so you don't have to select it again next time. 
		   
		
 
		Note: HTC BoomSound with 
		  Dolby Audio is not available over HDMI, 
		  Bluetooth, 
		  Miracast, or USB audio out.