HOW TO WIRE 2 DUAL VOICE COIL 4-OHM SUBS THAT HAVE MULTI-CONNECT LUG LOCK TERMINALS TO 1 2-OHM STABLE AMP?
Hi
There are four terminals correct? To connect the woofer's two 4 ohm coils in parallel will provide 2 ohms nominal, maybe lower so beware amp danger. To connect the two coils in phase, connect the two red or plus sides together and then the remaining two together. Use a small battery to check polarity if they are not marked. Mark the terminals that causes the cone to move forward when the battery plus side is touched.
There are four terminals correct? To connect the woofer's two 4 ohm coils in parallel will provide 2 ohms nominal, maybe lower so beware amp danger. To connect the two coils in phase, connect the two red or plus sides together and then the remaining two together. Use a small battery to check polarity if they are not marked. Mark the terminals that causes the cone to move forward when the battery plus side is touched.
Hi,
the two speaker drivers have four voice coils.
1. If you connect them all in parallel you end up with a quarter the nominal load of one voice coil.
2. If you connect the dual VC in each driver in series and then parallel connect the drivers then you end up with a nominal load equal to a single voice coil.
3. If you series connect the voice coils and then series connect the drivers you end up with four times the voice coil as your nominal load.
If each VC=4ohms then option 1 gives 1ohm,
option 2 gives 4 ohms and option three gives 16ohms. None are 2ohm equivalent.
If each VC=2ohm (making a 4ohm speaker) then option 1 gives 0r5, option 2 gives 2ohm and option 3 gives 8ohms.
You need to go back and look at you spreaker driver specifications and identify if you have dual 2ohm VC in each (=4ohm speaker) or dual 4ohm VC in each (=8ohm speaker).
Then you can connect appropriately.
Of the six combinations possible only one gives 2ohm (VC=2 option 2) and one gives 4ohm (VC=4 option 2, you will need to choose between the two.
the two speaker drivers have four voice coils.
1. If you connect them all in parallel you end up with a quarter the nominal load of one voice coil.
2. If you connect the dual VC in each driver in series and then parallel connect the drivers then you end up with a nominal load equal to a single voice coil.
3. If you series connect the voice coils and then series connect the drivers you end up with four times the voice coil as your nominal load.
If each VC=4ohms then option 1 gives 1ohm,
option 2 gives 4 ohms and option three gives 16ohms. None are 2ohm equivalent.
If each VC=2ohm (making a 4ohm speaker) then option 1 gives 0r5, option 2 gives 2ohm and option 3 gives 8ohms.
You need to go back and look at you spreaker driver specifications and identify if you have dual 2ohm VC in each (=4ohm speaker) or dual 4ohm VC in each (=8ohm speaker).
Then you can connect appropriately.
Of the six combinations possible only one gives 2ohm (VC=2 option 2) and one gives 4ohm (VC=4 option 2, you will need to choose between the two.
Hi Andrew
Maybe he is running a stereo amp, he doesn't really say much of the application he is intending in his post does he.. I think all of your assumptions is a single amp channel. Boy we both assume a lot given the lack of information.
BTW Are there any DVC 2 ohm speakers? I'm not aware of any, and if there are must be a very small number of them out there in the market, yes?
Maybe he is running a stereo amp, he doesn't really say much of the application he is intending in his post does he.. I think all of your assumptions is a single amp channel. Boy we both assume a lot given the lack of information.
BTW Are there any DVC 2 ohm speakers? I'm not aware of any, and if there are must be a very small number of them out there in the market, yes?
Hi,
I think there are quite a number of driver manufacturers that offer both 8ohm and 4ohm versions of their DVC speakers. The 4ohm versions must be dual 2ohm by definition. On that basis he could have either dual 2ohms or dual 4ohms.
But equally, we could wait till he responds, it's much quicker to double guess and risk the confusion that may ensue.
I think there are quite a number of driver manufacturers that offer both 8ohm and 4ohm versions of their DVC speakers. The 4ohm versions must be dual 2ohm by definition. On that basis he could have either dual 2ohms or dual 4ohms.
But equally, we could wait till he responds, it's much quicker to double guess and risk the confusion that may ensue.
Hi Andrew
Excuse my ignorance of DVC subs. Maybe you could point out a few examples of 2 coil drivers (DVC) with 2 ohms each. Thanks in advance but couldn't find any with a limited search.
Here is a link for the original poster.
http://www.partsexpress.com/resources/parser.html
Excuse my ignorance of DVC subs. Maybe you could point out a few examples of 2 coil drivers (DVC) with 2 ohms each. Thanks in advance but couldn't find any with a limited search.
Here is a link for the original poster.
http://www.partsexpress.com/resources/parser.html
Hi Infinia,
Cerwin vega stroker was available in dual 2 ohms version.I have one. Dont know about the latest model because mine is a few years old.
Bernard
Cerwin vega stroker was available in dual 2 ohms version.I have one. Dont know about the latest model because mine is a few years old.
Bernard
infinia,
Yes they are a beast to drive. I used it with a 1000w rms class d amp on each coil. it peaked 147.8 db with it in the first competition but nearly burnt the coil. Not musical subs though. only good for low bass.i checked even the new versions are 2 ohms per coil with an amazing 40mm X max in each direction.only good for spl competitions
Yes they are a beast to drive. I used it with a 1000w rms class d amp on each coil. it peaked 147.8 db with it in the first competition but nearly burnt the coil. Not musical subs though. only good for low bass.i checked even the new versions are 2 ohms per coil with an amazing 40mm X max in each direction.only good for spl competitions
tsc said:
quick eff calculation
10log(1000W+1000W)=33dB
147-33=114db/W
assume woofer has 88dB/W at 1m
cabin gain+mic position= 26 dB
Where is the mic placed when all this bass is going full tilt?
Must be a special microphone as well.
Not neccesarily, alot of manufacturers state the ohm rating of each coil.
Usually a 4 ohm DVC will have two 4 ohm coils, and you wire them for mono 2-ohm, 8-ohm or 2-channel 4-ohm.
Infinia, check out the Adire Tumult, they come in dual 2 or dual 4-ohm versions.
The microphone is placed with suckers to the windshield. Must be some type of condensor microphone and then is connected to computer.
Ahh so. The key it seems, is cabin gain. So the lower in frequency the woofer goes it's operating with more cabin gain. Tuning and placement/alignment of woofer must be the focus of winning systems. Be fun to show up with a system with 1/4 the amp power and win.
Something to try. Put up a solid baffle dividing the cabin into say 2/3, with woofer and 2 tuning ports in 1/3 side. One port between the baffle and other port leading outside of car. Use in 6th order alignment and tune both resonant peaks for max gain at mic. Or maybe try reversing 1/3 and 2/3 partition with one port aimed close to mic.
Something to try. Put up a solid baffle dividing the cabin into say 2/3, with woofer and 2 tuning ports in 1/3 side. One port between the baffle and other port leading outside of car. Use in 6th order alignment and tune both resonant peaks for max gain at mic. Or maybe try reversing 1/3 and 2/3 partition with one port aimed close to mic.
What we did close to what you are describing, is we put up a solid baffle dividing the small car in two. Two 15" MTX woofers front radiating to the front of the car while using the rear part of the car as a chamber. the port led also to the front of the car not outside. Spl 164.9 but still needed extreme power . 8 amplifiers 1000w rms each. 4 on each sub. All car panels were filled with concrete including roof. all glass was replaced with 12 mm perspex and doors were bolted down to the chassis. oh and the car could barely move under it s own power. But it was fun to build. system include 2 massive alternators and 12 Optima Gel batteries
No we were talking about spl competitions. The woofers cant reproduce music any good. The signal used is a cd in which the tracks are different low freq. Just like a signal generator
Oh! that's Ok then.
My 0.8W (800mW) ipod could produce about 124.9Db then, but I need to add a correction for the power compression suffered by the 1000W drivers. So adding about 5db for the lack of power compression gives 130db from 0.8W.
I'll settle for the Sherman tank equivalent and use the Ipod since I don't need the extra 35db.
Which prompts two questions;
q1. is it possible to get 131db/W in a small listening chamber?
q2. what sort of SPL levels are produced inside a sealed cabinet speaker?
My 0.8W (800mW) ipod could produce about 124.9Db then, but I need to add a correction for the power compression suffered by the 1000W drivers. So adding about 5db for the lack of power compression gives 130db from 0.8W.
I'll settle for the Sherman tank equivalent and use the Ipod since I don't need the extra 35db.
Which prompts two questions;
q1. is it possible to get 131db/W in a small listening chamber?
q2. what sort of SPL levels are produced inside a sealed cabinet speaker?
No answer for you from me.
But, Port Wars, SPL comp allows placement of the mic anywhere, even inside ports. The world record holder for that class actually made his "port" a small tube with an inner diameter of the Mic so they mic could be slid into the tube with almost sealed. Just a way of capatalizing on the internal pressures of a box.
But, Port Wars, SPL comp allows placement of the mic anywhere, even inside ports. The world record holder for that class actually made his "port" a small tube with an inner diameter of the Mic so they mic could be slid into the tube with almost sealed. Just a way of capatalizing on the internal pressures of a box.
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