I found what I was looking for............ regarding series wiring. I remember reading this back in the 1990s when JL audio was making a big splash in the car audio world. JL Audio dealers were sent a book/binder with info about their speakers, subs, enclosures etc and that is where I first read it I believe.
Like I mentioned before I have compared series vs parallel and I could not hear an audible difference. I only compared 2 subs in series I never tried 3 or 4 or more, maybe then there would be an audible difference? Or maybe it is more of a concern with higher frequency drivers and not as critical for subwoofers?
Anyway just thought I would post it to follow up if anyone was interested.
"Please note that when wiring multiple drivers, it is recommended that series connections between drivers be avoided at all costs. This does not include series connections made between voice coils on the same driver. For more information, please consult our dual voice coil tutorial section."
"It is far less desirable to make subwoofer to subwoofer connections in series. Due to slight and unavoidable differences between speakers and the high likelihood of uneven loading between different speakers in a car, there will be slight differences in the mechanical behavior of the two speakers in series. These differences in movement result in the creation of induced voltage (called back EMF) by the speakers across the series connection. This effect causes a problem when two speakers that behave differently are connected in series because the speakers can modulate each other (cause each other to move), resulting in distortion. The problem becomes more serious as more speakers are connected in series.
The following is a good experiment to show the effect of back EMF: connect four speakers in series and short the positive and negative input leads of the series circuit. Push down on one cone with your hand; you will notice that the three other speakers will move in the opposite direction of the one you are pushing. Now, reconnect the speakers in parallel, short the inputs and push down on one cone. The speakers will not modulate each other because each one is shorted directly."
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Last edited by bscool; 08-21-2018 at 12:21 AM.