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wiring/ohms help
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Barrington View Drop Down
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    Posted: 10 October 2009 at 6:13am
I plan to make a pair of x12 kinda enclosures, but instead of having 2x12's in each, il only have one in each.  So each one will have one 12" speaker, a horn driver, and a crossover inbetween (high pass for horn driver).  Below I have drawn two dodgy diagrams of how i think i can wire them.  Would you guys beable to tell me the ohms of each wiring diagram please?  The little circle on the right is a speakon jack.  Help will be greatly appreciated.
 
Diagram 1:  series?
 
Diagram 2:  Parallel?
Sorry for being so dumb with wiring.  Also, is that how a crossover works? as in does it have a pos and neg in, and a pos and neg out?
Thanks so much.
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topdiggy2 View Drop Down
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baarrington -
 
I dont use active passovers in my system at all. I suggest a rack mount passover. Typically the power that you are going to throw at these speakers will burn out those small crossovers in the cab or your HF driver because the power handling is different on them both.  In your diagram there is no way to regulate the power going to which driver ie turn your volume up and you might blow your tweeter before the woofer. 
 
Plus when you use a external you get better control over your signal. But if you insist on going with the internal cross over then the wiring would go as follows:
 
Speakon > cross over  > to driver running that freq band.  Again, internals are more for hi-fi home systems, not really a PA our loudspeaker kinda deal IMHO. i dont use them so i havent looked into them, but, i dont think you can find a internal crossover to do a 2/3 way split. Your problem is that you have a dedicated driver for both low section and hi so running parallel would require you sending the same signal to both....defeating the purpose of the crossover!
 
Either way you have them wired will work to get the XO freq to the right driver, but, you are leaving 2 issues on the table: 1. Can't Power to drivers 2. Not getting benifit of lowering ohm load.
 
Some else, feel free to chime in if im off base here.
 
Thanks
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Barrington View Drop Down
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Originally posted by topdiggy2 topdiggy2 wrote:

baarrington -
 
In your diagram there is no way to regulate the power going to which driver ie turn your volume up and you might blow your tweeter before the woofer. 
 
 
How so?
 
Originally posted by topdiggy2 topdiggy2 wrote:

baarrington -
 
Your problem is that you have a dedicated driver for both low section and hi so running parallel would require you sending the same signal to both....defeating the purpose of the crossover!
 
 
Please explain?
 
Originally posted by topdiggy2 topdiggy2 wrote:

baarrington -
 
 1. Can't Power to drivers 2. Not getting benifit of lowering ohm load.
 
 
Why cant I power both drivers?  What do you mean by benefiting by lowering ohm load? How is that done? How can I do that?
 
 
The 12" speaker is roughly 200 watts rms, the horn driver is also roughly 200 watts rms (400watts peak), they are both 8 ohms each, and the high pass crossover that will be passing 3500 hz and up for the horn driver can handle a maximum of 400 watts, I will only have a maximum of 200 watts going through the crossover to the horn driver.  The crossover is not meant to do anything for the 12" speaker, and that is why i have placed that crossover after the 12" speaker in the series wiring, or parallel to the 12" speaker in parallel wiring, (not on the same line as the 12" speaker).
Would series wiring be best for this?  What ohm load would this end up being in series?
Thanks so much for the help, Im doing this for my design and technology major work for year 12 at school.
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topdiggy2 View Drop Down
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Points: 57 		Post Options Post Options   Thanks (0) Thanks(0)   Quote topdiggy2 Quote  Post ReplyReply Direct Link To This Post Posted: 30 October 2009 at 2:50am
Barrington -
 
You can power both driver, what i meant to say is you cant regulate the power going to each driver independently. I was assuming you were using  a small Comp driver with lower power rating. But since they are the same ohm and can handle the same power rating then, yes, i think you will be okay in a parallel wiring for the ohm reduction.
 
In a series i think they will remain the same. I could be wrong but you may want to ask someone else in the advance section.
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