DVC - change RMS?

stevdart is my hero...that is the best i have ever heard that explained

Gene Norvel is the Vice Pres. of Power Acoustik. and does most of the designs.

Very nice man...met him in okla. @ Petra show.

Actually, Dave, you've corrected me before a couple of times...but that's how I learn things.  I have a pornographic memory so you know I don't forget much of what I read.  Close to two years ago I read through the JL help info and tutorials, including the info reprinted below:

http://mobile.jlaudio.com/support_pages.php?page_id=161

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.  Additionally, if you have an idea for a wiring configuration and you do not see it here, chances are you should re-think its implementation (in other words, don't do it). You will more than likely find that the results will be less than optimal.

http://mobile.jlaudio.com/support_pages.php?page_id=163

...Because all driver-to-driver wiring should be done in parallel and two 8 ohm drivers wired in parallel will yield a 4 ohm final impedance.

 

It is far less desirable to make subwoofer to subwoofer connections in series. Because of slight and unavoidable differences between speakers and because of 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 induced voltage (called back EMF) being created by the speakers across the series connection. This effect causes a problem when two speakers which 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.

A good experiment to show the effect of back EMF is the following: 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.

Back EMF modulation is not a concern when the voice coils of a dual voice coil speaker are wired n series to each other because the coils are physically coupled on one moving mass. Therefore, they cannot possibly modulate each other because they cannot move independently.

My memory didn't serve me as well as I wanted, though, with my statement:  At the same time, when you link the two coils of one driver in series the same applies.  What is the priority, then? ...if this info is the basis for what I wrote.  And I didn't remember where I saw this info, so I didn't review the alleged reason when I answered the post here this morning...thus I winged it best as I could.  Oh well...I'll remember all this the next time the subject comes up, including your argument.

Since I read this I have noticed that wiring diagrams always favor series/parallel, where they certainly could show the wiring the other way instead.  And I have read nothing from any of our resident experts, including you Dave, that specifically addressed this question.  So I've had this impression all this time.  I'll have to keep an eye out for pros and cons on the subject.  And now I presume you'll get onto JL right away and let them know of their error?   ;)

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

My fault for relaying that bit of information so poorly.  I knew the basis but not the real reason, and it probably would have resulted in a different response from you, Dave, had I waited until I had enough time to find the backup source before answering.  "Winging it" often puts me in the hot seat, but this time I made hero status!  :)