ER4SR is Etymotic’s reference hi-fidelity in-ear monitor, for those who demand nothing less than the highest reproduction accuracy. The ER4SR right and left channels are matched within an industry-leading 1dB across frequencies from 100 Hz to 10 kHz.
 
					















 
		 
		 
		




 
		 
		
 
								 
								
 
	     
	 
	 
	 
	
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