ugh.....doesnt sound good to me at all. i dont know what it is but it just sounds bad.
- Thread Starter
- #3
yeh, sounded no good to me either, cause then people would be talking about it. The kid knows whats up but hes not any speaker designer/engineer... maybe someone else knows...
avistar23
10+ year member
www.SoundhertZ.com <---
Souds like a pile of horse shit to me.... i woudln't let him touch my sub.
- Thread Starter
- #6
i couldnt tell ya steve, but anyway i just called there (circuit city, where he's getin it hooked up:nono: ) They said all your doing is running one voice coil's negative to the other negative, to the negative amp speaker channel, then possitive>possitive.possitive amp channel. He said it will pull more from the amp ,and maybe make it "hit harder" but possibly distort. i'm gonna try calling a real shop tommarow and ask them, cause they'll tell me what i wanna hear "thats BS, the will ruin the speaker, circuit city dont know sh*t", but who knows...
mgthose guys are idiots. thats gonna burn up that sub in no time.
ngsm13
5,000+ posts
BSEE
umm....yeah that's just wired to parallel....which will give u the lowest ohm load.....which for 2 dual4ohm subs would be 1 ohm. peace
NG
it might be, but mgaidica didnt say whether or not they were wiring from one + and - to the other on each sub...
The technique I think you are referring to is called "resistively damped operation"...
And generally you don't simply short the 'extra' voice coil, but rather you wire a resistance across it (although you could just short it, but it wouldn't really provide any benefit ).
This isn't EXACTLY your situation by the numbers.. but this example is the same, just a little simplified for other readers, if I am understanding your situation correctly:
Let's say you have a dual 2 ohm sub that handles 1600 watts (800 per coil), and you have an amplifier that makes about 1600 watts into a 1 ohm load.
In this case, simple. You just wire the voice coils in parallel (tie all the +'s together, tie all the -'s together), and end up with a 1 ohm load presented to the amp, which therefore makes 1600 watts through that load. All fine and dandy...
...until the day you decide one sub isn't enough, and you really like your stuff, so you buy another of the same sub. Now, you have a total of four 2 ohm voice coils (two per subwoofer).. you can't wire them to yield a 1 ohm load, period.
But you COULD wire just one voice coil (2 ohms) of one subwoofer in parallel with just one voice coil of the other subwoofer, and end up with the same 1 ohm load that you had previously.. the amp would make 1600 watts, each sub would get 800 watts, all would be fine and dandy... there's just the issue of what to do with the now-vacant coils! //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
There are a couple things to be aware of, but none of them having an impact on the enclosure for the subwoofers... Qes will be higher...
Generally, reaching maximum output on "just" 800 watts wouldn't be an issue too much, as you can go larger on the enclosure, and reach maximum excursion with less power (two legs of Hooke's Iron Law: enclosure size and efficiency are proportional).
Not to mention it takes a quadrupling of power to effect a doubling of excursion (and that's the theory.. in reality, it may be worse!//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif).. so you don't have as much ground to make up as you might think.
You could just wire a jumper across the + and - of each vacant coil, and be done with it.
But why do that?
You can have more fun with it than that..
Resistively Damped Operation allows you to actually vary the Qts of the driver, based on the amount of resistance placed across the coil.
The real fun to be had is when you wire a potentiometer across the 'vacant' coil.. then you can turn the dial, and change the Q at will! //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
Adire has a great article in their tech library about it, I highly recommend you give it a read:
http://www.adireaudio.com/tech_papers/rdo_operation.htm
And generally you don't simply short the 'extra' voice coil, but rather you wire a resistance across it (although you could just short it, but it wouldn't really provide any benefit
).This isn't EXACTLY your situation by the numbers.. but this example is the same, just a little simplified for other readers, if I am understanding your situation correctly:
Let's say you have a dual 2 ohm sub that handles 1600 watts (800 per coil), and you have an amplifier that makes about 1600 watts into a 1 ohm load.
In this case, simple. You just wire the voice coils in parallel (tie all the +'s together, tie all the -'s together), and end up with a 1 ohm load presented to the amp, which therefore makes 1600 watts through that load. All fine and dandy...
...until the day you decide one sub isn't enough, and you really like your stuff, so you buy another of the same sub. Now, you have a total of four 2 ohm voice coils (two per subwoofer).. you can't wire them to yield a 1 ohm load, period.
But you COULD wire just one voice coil (2 ohms) of one subwoofer in parallel with just one voice coil of the other subwoofer, and end up with the same 1 ohm load that you had previously.. the amp would make 1600 watts, each sub would get 800 watts, all would be fine and dandy... there's just the issue of what to do with the now-vacant coils! //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
There are a couple things to be aware of, but none of them having an impact on the enclosure for the subwoofers... Qes will be higher...
Generally, reaching maximum output on "just" 800 watts wouldn't be an issue too much, as you can go larger on the enclosure, and reach maximum excursion with less power (two legs of Hooke's Iron Law: enclosure size and efficiency are proportional).
Not to mention it takes a quadrupling of power to effect a doubling of excursion (and that's the theory.. in reality, it may be worse!//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif).. so you don't have as much ground to make up as you might think.
You could just wire a jumper across the + and - of each vacant coil, and be done with it.
But why do that?
You can have more fun with it than that..
Resistively Damped Operation allows you to actually vary the Qts of the driver, based on the amount of resistance placed across the coil.
The real fun to be had is when you wire a potentiometer across the 'vacant' coil.. then you can turn the dial, and change the Q at will! //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
Adire has a great article in their tech library about it, I highly recommend you give it a read:
http://www.adireaudio.com/tech_papers/rdo_operation.htm
- Thread Starter
- #11
i didnt quite understand the guy at circuit city, so maybe i missed something but it did sound like wiring in parallel to me. Once again there 2 12" L7 4 ohm, and he said they'll be wired to around 2 ohms...
bass maniak
10+ year member
Team Poundin Sound
its jus wired in paralell but i may have missed somthing
Oh, are they single voice coil subs?
Two 4 ohm single voice coils, wired in parallel would present a 2 ohm load to the amplifier.
That's very straightforward.. just tie all the + terminals together electrically, and all the - terminal together, electrically.
You could just go jumping from + to + to + to + (etc..)
and another wire jumping from - to - to - to - (etc.. I know you don't have that many.. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif)
But the article I posted is still an interesting read!
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