Brane Audio's "Repel Attract Driver"

[Brian Steele]

I wonder when we'll see this tech show up in the car audio subwoofer world..?

https://audioxpress.com/index.php/n...n ... -subwoofer

Quote: "This new driver utilizes a combination of moving and stationary magnets to create a force that is equal and opposite to the force caused by large air pressure changes within a speaker enclosure. "

Simply put - put a normal subwoofer driver in a small sealed box, and the resonance frequency is increased (the smaller the box, the higher the resonance frequency) and the more power you have to feed it for it to reproduce anything below the resonance frequency. The supposed design of this new driver basically removes the effect of the box it's in, which should significantly increase output at low frequencies, and require a lot less power to achieve the same SPL at those frequencies.

[Rovin]

it saying : ...
We're really sorry but this link seems to be broken.
We are working on correcting this error. In the meantime, please use the search function on our website to find what you're looking for.

[Brian Steele]

it saying : ...
We're really sorry but this link seems to be broken.
We are working on correcting this error. In the meantime, please use the search function on our website to find what you're looking for.

Weird - this one's working from me (did a quick Google Search)

https://audioxpress.com/news/brane-audi ... -subwoofer

[Brian Steele]

Here's another link - https://www.msn.com/en-us/lifestyle/sho ... r-AA169pSJ

[Rovin]

d other links working

well that is different, wonder how come nobody else did it b4 , waits to see what d experts out there think of it when they say they doing a full product launch ...

[ruffneck_12]

"The supposed design of this new driver basically removes the effect of the box it's in,"


I still cornfused, how exactly does it achieve this using the moving magnets?

[sMASH]

https://audioxpress.com/index.php/news/ ... -subwoofer

[sMASH]

That will work, but the complexity of the mechanism may be there just to drive up price tag.


It SEEMS TO ME, that the have another magnet on top the coil. So when it pushes off the regalar magnet, it moves out of the magnetic Feild of thst magnet, and into the magnetic feild of the upper magnet.


The new terminology is marketing snake oil to have a higher price tag and pull in the "shaddup and take my money" crew.


It will work, just might be over priced fir what it is.




Me, I would just add weight to the sub diaphragm, to shift the resonance down to 30hz.
And where that reduces the upper range of that driver, put another driver to fill that gap.

[ruffneck_12]

ah boi, a man was telling me you is the man to talk to bout modding speakers inno

[sMASH]

One driver per octave, bro.


Take a AC 2xs, and run the high pass to the rear in of a 4xs, and take the low pass out of the 2xs and and feed that to the front in of the same 4xs.

5way cross:
Sub
Bass,
Midbass/lowmids
Mid/high mids
Highs.


(obviously not each octave... Talking like Michael Bay movies)

[Brian Steele]

Me, I would just add weight to the sub diaphragm, to shift the resonance down to 30hz.
And where that reduces the upper range of that driver, put another driver to fill that gap.

Adding weight significantly reduces efficiency, and the driver's suspension has to be designed to carry the extra weight without the coil being offset enough to rub against the pole. So, no, that's not a suitable alternative.

[sMASH]

I'll try it on a 6" and see how much weight to get it to tune lower. That sag is a Legit consideration.


Overall efficiency would drop but not so much at the target bandwidth. I just merely looking for a poor man's version to tune lower.

[Brian Steele]

d other links working

well that is different, wonder how come nobody else did it b4 ,

The use of neo magnets does open some new opportunities due to their strength in relation to their size and weight. And who knows - maybe someone people did try it before and just couldn't get it to work. Of course, it could turn out to be a distortion machine like Yamaha's YST tech - let's see what March brings ...

[sMASH]

Some company did have dual motors, but for spl..

Steve Meade used them back in the day, in some vids.

[timelapse]

Would alnico magnets work? Stronger field in a smaller package.

[Brian Steele]

Some company did have dual motors, but for spl..

Steve Meade used them back in the day, in some vids.

Not the same thing.

Ok, let me see if I can try to explain the idea, at least how I understand it.

Take any normal bass driver, without any power applied to it. Deflect the cone from its rest position by pushing on it and then releasing. The cone will be bought back to its rest position by its suspension, the spider being responsible for most of the restoring force with the surround providing the rest. The only things providing a restoring force to the cone are the spider and the surround.

With this new driver, magnetic attraction is added to that list of forces acting on the cone, and this additional force is working in opposition to the restoring force provided by spider and the surround, i.e. , the more you deflect the cone from the rest position, the more this new force pulls the cone away from its rest position. If this new force is more powerful than the restoring force provided by the spider and surround, the cone will never return to its rest position. I'm guessing that it's likely tuned to be slightly less, which is going to significantly reduce the resonance frequency of the driver, without having to resort to efficiency-robbing solutions like adding a lot of mass to the cone, or problematic solutions like using very weak spiders to lower the resonance frequency.

Well, at least that's my guess as to what's going on with this "Repel Attract Driver"

[Brian Steele]

Would alnico magnets work? Stronger field in a smaller package.

Neo magnets can be a lot smaller for the same magnetic strength.

[sMASH]

Some company did have dual motors, but for spl..

Steve Meade used them back in the day, in some vids.

Not the same thing.

Ok, let me see if I can try to explain the idea, at least how I understand it.

Take any normal bass driver, without any power applied to it. Deflect the cone from its rest position by pushing on it and then releasing. The cone will be bought back to its rest position by its suspension, the spider being responsible for most of the restoring force with the surround providing the rest. The only things providing a restoring force to the cone are the spider and the surround.

With this new driver, magnetic attraction is added to that list of forces acting on the cone, and this additional force is working in opposition to the restoring force provided by spider and the surround, i.e. , the more you deflect the cone from the rest position, the more this new force pulls the cone away from its rest position. If this new force is more powerful than the restoring force provided by the spider and surround, the cone will never return to its rest position. I'm guessing that it's likely tuned to be slightly less, which is going to significantly reduce the resonance frequency of the driver, without having to resort to efficiency-robbing solutions like adding a lot of mass to the cone, or problematic solutions like using very weak spiders to lower the resonance frequency.

Well, at least that's my guess as to what's going on with this "Repel Attract Driver"

I understood all of that.

What I'm picturing in my head, is that the coil's rest position Is in between both motors.
So at rest it sees the partial Flux from both feilds, the sum which could be as if it was in a traditional motor.

When it get signal to drive, it pushes forward FROM one motor, and pulls into the more dense Flux of the other motor. And vice versa for the othe side of the wave.

So , at either end of the wave, when the signal would be at its weakest and would rely of the suspension to restore it , it will have the the help of the dense flux to do some of the restoration.

And Im thinking the spider will be very soft, and they will rely on the motors to do the majority of the restoration.





Woudl really like to see a cut away of that driver now.

... And now thinking of getting some neo slugs to build a driver according to my imagination now.

Put the neo slugs at the TDC and BDC of the coil.

[ruffneck_12]

I was talkin bout sumn similar in another thread and someone told me to talk to u bout it

Still waiting for u :'(


viewtopic.php?f=3&t=765750&hilit=smashnarine&start=120#p10330853