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		The unit applied input short design : 
		 
			         
			The  
			
		unit  had design the analog idle input 
		short circuit for avoid the disturb between different sources. 
         This design also applied in a 
		lot high end 
		brand devices. 
         The working theory :  
			 Without the idle input short circuit 
			,if 
			 the 
		input 5 and input 4 had connect two extra DACs,  while users select 
			the either input 5 and input 4 , the another input signal 
		will fire through the circuits and mix  into the using signal, even though this 
			signal is  weak  but still can degrade on the sound 
		quality. 
          With the idle input short 
		circuit function : if user select either the input 5 and input 4, the 
			another input signal will short 
		circuit then no any signal fire through circuits , can keep the sound 
		quality had not degrade. 
		          Below case users 
		 don't want the idle input short 
		circuit function, users can open the chassis, pull off the jumpers of 
		the proper input channels, please note must pull off of left and right 
		channels together : 
        1, The same extra source not only connect the 
		unit analog input, but connect with other amps simultaneity.  
        2, The same extra source connect to the 
		unit 
			 different inputs  at simultaneity. 
		
			
			
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