Ok guys, 
I have bought an absolutely beautiful bass recently, but the previous owner for some reason had emg 40hz s but in it (on a bass that cost over 2 grand) so I want to swap these out. 
I have found that I am a bartolini person so I have looked at their options for this size rout and it comes down to this: 
The m45cbc 
The 72m45c 
The xx45c 
And the xx45m 
Does anyone know how these pickups sound? 
I know the specs of the pickups, just not the sound that they'll produce.  
Any reccomendations? 
(I have a 5 string with a low B by the way) 
Thanks