Stereo Integrity BM update

[Electrodynamic 10+ year member]

Im asking if its possible to use a big tyoke n small top plate in a underhung design instead on a small t yoke n a big toplate and would it be the same effect if the xbl rebate was in the tyoke instead of the top plate ill make a drawling when I get home so you'll get a better idea what im sayin. Think about the xcon or new btl motor design but the huge bumped tyoke as the top plate for a underhung or xbl sub

No, it won't have the same effect. Simply making the backplate larger with a rebate in it won't make it more linear or an XBL^2 sub at all. XBL^2 manipulates the flux in the gap, not at the backplate (you can't make a driver more linear just by increasing the size/height of the backplate and throwing a random rebate in it). Where it counts is in the gap. XBL^2 has a rebate in the top plate near the coil and at the top of the pole piece to manipulate flux and make the driver more linear. The coil also has to be a very specific length and be positioned correctly in order to make it all work.

You can read more about it here in a paper on XBL^2 that we have hosted.

 

[SPLaudio 5,000+ posts]

whats the excursion in mm? also what keeps the cone from hitting the spider?

 

[negative3five 10+ year member]

What I was sayin was switch the role of the top plate n t yoke like put the rebate into the t yoke on a xcon wit that huge bumped back plate like set it all up correct coil size n centering not just do it on a random sub. I was just usin the xcon as a example but I ment designing a subwoofer like that to be setup correct.

 

[Electrodynamic 10+ year member]

See my edited post. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif I knew you were talking about a rebate before, but I didn't include it in my explanation, but now it does.

The voice coil has to be in the gap, not far away from the gap. There's a lot more to it than simply making random gaps in areas where it doesn't count.

 

[Electrodynamic 10+ year member]

whats the excursion in mm? also what keeps the cone from hitting the spider?

18mm total one-way, 13mm one-way linear.

It does hit the spider at the very last mm of total throw. Other than that, there is just the perfect distance from the diaphragm to the top of the spider and not a smidge more or it would increase the depth of the driver.

 

[Kyle_Keating 10+ year member]

What I was sayin was switch the role of the top plate n t yoke like put the rebate into the t yoke on a xcon wit that huge bumped back plate like set it all up correct coil size n centering not just do it on a random sub. I was just usin the xcon as a example but I ment designing a subwoofer like that to be setup correct.

i think you are confused as to what a t-yoke does and the direction in which flux travels thu a motor

look at this illustration, the flux lines cross the air gap at the top of the motor. its at the top because the voice coil needs to connect to the cone somehow.

this is an overhung motor

 

[negative3five 10+ year member]

Nm I got it now wit that pic so basicly all that steel on the btl is just for clearence?

 

[Kyle_Keating 10+ year member]

I understan what your sayin nick but what's the difference if you put it over or under the mags basicly is what im askin

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because the voice coil needs to connect to the cone somehow.