alexreinhold said:Thanks for the explanations everyone - I get the difference between series and parallel at this point but I would still be a lot more happy if I actually understood the fundamental electrical engineering component better. A colleague of mine is a physicist who builds amplifiers himself - so I will let him crash-course me
stratamania said:Having a switch to switch between 18V series or a single battery running in 9V as EMG suggested might give a chance to see which set up you prefer. Though the only practical purpose I can think of is if you need to replace batteries and only have a single replacement available as you are about to play Madison Square Garden may have a benefit. Though the moral here is if you are using active pickups is to have spare batteries in the gig bag.
@Stratamania I have 2 questions and 1 remark regarding that. Questions:
1. so the push/pull wiring diagram from EMG makes sense, you just don't see the practical purpose in it, right?
2. isn't there supposed to be an actual sonic difference between 18V and 9V?
Remark: Madison Square Garden might be a stretch but I refuse to stop dreaming But in all seriousness, the guitar that I am building is supposed to be as metal as possible. And the beauty about metal is that we metalheads do take it seriously but also like to make fun of ourselves. One of the things that is right on the edge of being dead serious and total BS is the legendary 18V mod. And I thought it was a nice gimmick to be able to switch between the standard 9V (as the default) to 18V mod just because I can. Does that make sense?
To answer your question number two, look to the link that I posted that indicates perceived results to be subjective specifically to headroom. To understand headroom, read up on “audio gain staging” or “gain structure” to put into its proper context.