Subwoofers in Series?
11-07-2006, 06:37 PM
#41
Originally Posted by Haunz
dukk...... there is no way that two coils in series can not see the same signal as one another....... one electron in will always cause one electron out....... and that is the bottom line....
Haunz
2 speakers in series will see the same current, but depending on their impedances, they will not neccessarily see the same voltage accross their terminals.
a 3.9 ohm resistor and a 4.1 ohm resistor in series have the same current, but not the same voltage accross each.
Same is for 2 speakers in parallel. They will see the same voltage, but the current passing thru them will depend on impedance.
11-07-2006, 07:23 PM
#42
^ that is %100 true...........
Edit: and the underlying point is still that an amp's voltage will be across BOTH of two coils in series...... and that the current flowing between them must be exactly the same......... differences in amplitude between coils are due to resistance (impedance)........
Edit: and the underlying point is still that an amp's voltage will be across BOTH of two coils in series...... and that the current flowing between them must be exactly the same......... differences in amplitude between coils are due to resistance (impedance)........
Last edited by Haunz; 11-08-2006 at 10:12 PM.
11-08-2006, 02:08 PM
#43
Originally Posted by StickyFingaz
Can someone explain to me why it is unadvisable to wire multiple subwoofers in series?
JL Audio's website says to avoid it at all costs, but my simple mind can't figure out why....
JL Audio's website says to avoid it at all costs, but my simple mind can't figure out why....
The anwer I got from JL:
"Thank you for your interest in JL Audio.
All your assumptions are correct. I do not have anything that I can provide to you, to show what we are discussing. In our statement we do say it is less desirable, but we never say don’t do it, it is just a recommendation.
In the real world in most cases the issues that arrives when wiring woofers together in series is not going to cause a large enough conflict.
Steve Duffield
JL Audio, Technical Support Manager "
There you have it...You can now wire woofers in series and sleep well at night.
thanks guys for the great discussion!
11-08-2006, 02:43 PM
#44
Administrator
Join Date: Feb 2006
Posts: 16,855
^ Is this not what I have been saying? 
Not the end of the world but definitely something to avoid if possible.
Haunz - you're not even discussing the topic anymore.
The point was and is that the woofers interract negatively when wired in series.
Not the end of the world but definitely something to avoid if possible.Haunz - you're not even discussing the topic anymore.
The point was and is that the woofers interract negatively when wired in series.
11-08-2006, 03:23 PM
#45
Originally Posted by Dukk
^ Is this not what I have been saying? Not the end of the world but definitely something to avoid if possible.
Haunz - you're not even discussing the topic anymore.
The point was and is that the woofers interract negatively when wired in series.
Not the end of the world but definitely something to avoid if possible.Haunz - you're not even discussing the topic anymore.
The point was and is that the woofers interract negatively when wired in series.
And I will ignore any additional posts on this topic unless
they are backed up by verifiable theory or measurments. We are not talking about someones subjective preference for one brand speaker vs another. We are talking about a technical statement that should be void of any subjectivity and should be provable by theory or measurement.
Now, I have work to do...as I use theory, and Finite Element Electromagnetic simulation software to design an emiting coil for a Magneto Resonace medical imager at...65 MegaHertz (an MR imaging scanner as found in hospitals)
Last edited by zoomer; 11-08-2006 at 03:32 PM.
11-08-2006, 05:11 PM
#46
Originally Posted by zoomer
To me that is irresponsible and should negate their web statement.
I think a lot of warnings that are stated are not always meant for someone who knows what they are doing, and maybe JL's statement was aimed at someone purchasing their equipment that knew nothing about caraudio, or audio drivers in general.. I'm sure if you contact car manufactures and ask them if running a 3kw system in their vehicle is a wise thing to do, as far as everything else in the car is concerned, (electrically speaking) and they will tell you not to do it. there are warnings all over the place, and sometimes it's up to you to make your own comclusions, and just live with it.
If you don't like the answers given because they are not backed up with pages, and pages of technical data, then that's fine, but in my book experience count's for a lot more than technical theory...
regards, Mark
11-08-2006, 11:33 PM
#47
/\/\/\/\ What he said....
I believe we have now reached the point where the hair has been split so fine it has vanished from human sight....just like the variances in output from the woofers in series would be inaudible.....
I believe we have now reached the point where the hair has been split so fine it has vanished from human sight....just like the variances in output from the woofers in series would be inaudible.....
11-09-2006, 02:40 PM
#49
Administrator
Join Date: Feb 2006
Posts: 16,855
Zoomer - sorry, I missed the sarcasm in your validation of the response from JL.
Once again - if you are so intent on proof then I suggest you do the testing. You seem to indicate you have a clue about design and testing procedures.
Once again - if you are so intent on proof then I suggest you do the testing. You seem to indicate you have a clue about design and testing procedures.
11-09-2006, 04:38 PM
#50
^ likewise how can you be so sure that you/JL arn't promoting something that is not true without having any 'proof'.. ?
I just PMd zoomer with a long post of basic math/reasoning, and although there is no substution for testing 'in the real world' we can still make some clear observations...... (plus I don't have 1/2 the measurment gear Id need to do some testing with me at the moment)
But I will still stand by my previous statments... and although subs in series may modulate eachother electrically we are only adding their differences in series instead of in parallel.... and to boot the woofers will always exhibit thier mechanical differences no matter what we do...... (ie run them on different amplifiers)
One point that I hope I've driven home is that two subs in series must see the same signal at the same time... and that it is clearly impossible for one woofer to drive the other with back EMF......... (this will simply be seen as capacitance by the other woofer !)
More on this to follow.....
I just PMd zoomer with a long post of basic math/reasoning, and although there is no substution for testing 'in the real world' we can still make some clear observations...... (plus I don't have 1/2 the measurment gear Id need to do some testing with me at the moment)
But I will still stand by my previous statments... and although subs in series may modulate eachother electrically we are only adding their differences in series instead of in parallel.... and to boot the woofers will always exhibit thier mechanical differences no matter what we do...... (ie run them on different amplifiers)
One point that I hope I've driven home is that two subs in series must see the same signal at the same time... and that it is clearly impossible for one woofer to drive the other with back EMF......... (this will simply be seen as capacitance by the other woofer !)
More on this to follow.....
