running on one voice coil

[infernobackman 10+ year member]

howcome it wont be seeing a .75 ohm load?

the only way to learn is to ask questions, right? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Twistid 5,000+ posts]

howcome it wont be seeing a .75 ohm load?the only way to learn is to ask questions, right? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

impendence rise... i dont understand it but the box + wire + all sorts of things cause the resistance to rise thus you will never see the same impendence from the coils going to the amplifier

and anyways you have a got **** badass amp... that thing will handle it like a champ, trust me //content.invisioncic.com/y282845/emoticons/naughty.gif.94359f346c0f1259df8038d60b41863e.gif

 

[infernobackman 10+ year member]

haha, thanks //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

.. i like it

ill take your word for it and wire it up tomorrow and see how it likes it

 

[iceteebone 5,000+ posts]

howcome it wont be seeing a .75 ohm load?the only way to learn is to ask questions, right? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

it's hard to explain technically, but when you play music your impedance will rise //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[infernobackman 10+ year member]

think because of the heat? resistance? idk

 

[iceteebone 5,000+ posts]

also if you run only 1 voice coil you cut the power handling in half and run the risk of frying that coil due to pushing it past it's limits. this must be one hell of a sub if you are running a t40001 to it

 

[infernobackman 10+ year member]

so yea, that makes me want to hook up both coils right now... lol

its a trf 15" of course its one hell of a sub //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[Twistid 5,000+ posts]

just do it... there will be no problem except you should take it easy on the gains... 4kw going to a single 15" ....

 

[iceteebone 5,000+ posts]

so yea, that makes me want to hook up both coils right now... lolits a trf 15" of course its one hell of a sub //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

yes hook up both coils. i assume your sub is a 4000 watt rms sub so each voice coil is rated at 2000 watts.

 

[Volenti 10+ year member]

yes hook up both coils. i assume your sub is a 4000 watt rms sub so each voice coil is rated at 2000 watts.

It's more complicated then simply halving the power when running only one coil, not only does the active coil not have to deal with the heat given off by the unpowered coil, the unpowered coil actually acts as a heatsink for the active coil, doubling it's thermal mass and radiating area, in that sutiation the active coil will have well over 50% of total RMS, closer to ~80% of the powerhandling of both coils together.

 

[audioholic 5,000+ posts]

yes
you'll do more harm that way then running your amp at 0.75 ohms.

Just wondering why you never explained this reply, seeing as it wont damage anything.

I dont think anyone has mentioned in this thread.... when running a dvc with only one coil, all your t/s specs (and therefore enclosure specs) change. Precious few manufacturers list t/s specs for any of their dvc models with only one coil powered.

 

[T3mpest 10+ year member]

Just wondering why you never explained this reply, seeing as it wont damage anything.
I dont think anyone has mentioned in this thread.... when running a dvc with only one coil, all your t/s specs (and therefore enclosure specs) change. Precious few manufacturers list t/s specs for any of their dvc models with only one coil powered.

AA did.

 

[Death By Bass 10+ year member]

Just wondering why you never explained this reply, seeing as it wont damage anything.
I dont think anyone has mentioned in this thread.... when running a dvc with only one coil, all your t/s specs (and therefore enclosure specs) change. Precious few manufacturers list t/s specs for any of their dvc models with only one coil powered.

i do believe they change weather they are in series or parallel aswell...

most manufacturers will list the BL figure, with both coils wired, to give the higher number, but then list specs for the other wiring config... cant remember which is which, but basically, they try to make the woofer look better.

 

[helotaxi 5,000+ posts]

i do believe they change weather they are in series or parallel aswell...
most manufacturers will list the BL figure, with both coils wired, to give the higher number, but then list specs for the other wiring config... cant remember which is which, but basically, they try to make the woofer look better.

Most of the specs show the coils wired in series. The difference is non-existant between the two wiring configs though. The BL is listed typically as N/A. With the coils wired in series the total current for a given power is half that compared to in parallel. Wiring in parallel halves the BL but doubles the current. In the end there is no difference.

 

[Polecat 5,000+ posts]

Using only one of the two coils in a dual voice coil woofer will change the T/S parameters. There will effectively be less copper in the magnetic gap, so the BL (magnetic strength through the wire in the gap) will be less. Therefore the Qes will be less, and of course the Qts will be less. Adding resistance to connect the other coil will not help.

Ideally, if you had to use only one coil you would want to retest the woofer and get new T/S parameters and use these to design the enclosure. Remember that the power handling will now be half of what it was using both coils.