Typical turns ratio is about 500 1 to match a nominal 50 kω signal source such as the magnetic pickup of an electric guitar to a 100 ω input.
													
																	Active di box vs passive. 
									
	
		
	
																	Active di units and passive di units. 
																	The most obvious difference is that passive di boxes don t need to be powered. 
																	Passive does not have active electronics and therefore does not require an external power source. 
																	But the differences go deeper than that. 
															
													
									
	
		
	
																	They contain a transformer to perform impedance matching and balancing and very little else the strength and impedance of. 
																	Passive di boxes are basically just transformers. 
																	A passive di unit typically consists of an audio transformer used as a balun. 
																	In contrast active boxes do have active electronics which are powered by external power sources. 
															
													
									
	
		
	
																	The biggest difference between an active di and a passive di is that an active di includes a preamplifier. 
																	Active di boxes require a power source usually batteries or phantom power over an xlr jack. 
																	The most basic definitions of the two different kinds of di boxes are likely what you d expect.