Reconing subs, got spyder glued down. Now surround has a 1/2" gap. how to fix??

[hispls 5,000+ posts]

Big bonus points for not dry-fitting the recone before you glued....

Just glue down the surround, I highly doubt there will be any audible difference.

 

[ciaonzo 5,000+ posts]

I wasn't addressing mechanical headroom or runout, I'm was addressing linearity. I then quickly recalled what forum I was on. Now we're going to confuse boundary loading with pretension on the suspension? Come on.

I'm reffering to offset of Kms vs. BL overlap. Something that ends up looking like this, which causes harmonic distortion among other things.

More on the topic:

Asymmetrical Nonlinearities

Asymmetrical nonlinearities produce not only second- and higher-order distortions but also a dcpart

in the displacement by rectifying low frequency components.

For an asymmetric stiffness characteristic the dc-components moves the voice coil for any

excitation signal in the direction of the stiffness minimum.

For an asymmetric force factor characteristic the dc-component depends on the frequency of the

excitation signal. A sinusoidal tone below resonance (fvoice coil always in the force factor maximum. This effect is most welcome for stabilizing voice coil

position. However, above the resonance frequency (f>fS) would generate a dc-component moving

the voice coil in the force factor minimum and may cause severe stability problems.

As you were.

 

[ciaonzo 5,000+ posts]

Big bonus points for not dry-fitting the recone before you glued....
Just glue down the surround, I highly doubt there will be any audible difference.

I will concede to this point, everything in context.
Here, all that really matters is how much power you can throw at it.

Or,

Do it bang?

 

[zedicus 10+ year member]

I wasn't addressing mechanical headroom or runout, I'm was addressing linearity. I then quickly recalled what forum I was on. Now we're going to confuse boundary loading with pretension on the suspension? Come on.
I'm reffering to offset of Kms vs. BL overlap. Something that ends up looking like this, which causes harmonic distortion among other things.

More on the topic:

Asymmetrical Nonlinearities

Asymmetrical nonlinearities produce not only second- and higher-order distortions but also a dcpart

in the displacement by rectifying low frequency components.

For an asymmetric stiffness characteristic the dc-components moves the voice coil for any

excitation signal in the direction of the stiffness minimum.

For an asymmetric force factor characteristic the dc-component depends on the frequency of the

excitation signal. A sinusoidal tone below resonance (fvoice coil always in the force factor maximum. This effect is most welcome for stabilizing voice coil

position. However, above the resonance frequency (f>fS) would generate a dc-component moving

the voice coil in the force factor minimum and may cause severe stability problems.

As you were.

wouldn't it take actual static loading of the entire suspension to cause that situation? something that i would assume is not happening from a tiny offset from a large foam roll?

and honestly i am really asking, im not trying to be a smart arse i just don't really know, like i said, im not a speaker builder, i do stock repairs and occasionally replace a voice coil or do a recone.

 

[SPLaudio 5,000+ posts]

if you only knew how many subs out there they do bias the surrond alot. many big names out there, mostly companys that believe adding a spider or 2 adds power handling ,lol...

 

[terra 5,000+ posts]

Looks to me like a hell of a lot more than 3/16". Maybe to the top of the lip but not down to the surround landing. Shane is right, it will most definitely have an effect on the woofer. Negligible or not, the effect is still there. Saying big name companies do it too doesn't make it correct.

 

[35thStangGT 10+ year member]

Now im worried. Im throwing 2000 watts at this sub.

 

[bhsdriller 10+ year member]

cut out a ring of wood that thickness, glue it down first then glue surround to the wooden ring

idk lol....super ghetto but could work I guess

I'd just glue it like it is and slam away on it

 

[SPLaudio 5,000+ posts]

the pix with the spiders not glued down yea cause this nomex spiders dont lay tight like a old nuway progressive design, but when the spiders glued down its not more than 3/16". the surrond is not stiff and takes nothing to move it up to 1/4" and it dosent effect the roll.

do you know the compliance of the surrond i use?

 

[SPLaudio 5,000+ posts]

you should be i told you 2000rms for the 8 layer coil, 1500rms for the fat 4 layer.

 

[ciaonzo 5,000+ posts]

Now im worried. Im throwing 2000 watts at this sub.

Then you'll be fine, lol. You're not worried about linearity. I was simply addressing compliance offset issues.
If the surround is softer than it looks, like SPL says, things won't be so bad. There will be some small sacrifice in total excursion but not much. If you're going vented, you'll be fine.

 

[DonH 5,000+ posts]

lmao all of this bitching back and forth that could have been avoided if the re-cone had been measured and assembled correctly... we all make mistakes, being able to admit when this happens is another story. I agree with shane as well. that is far to big of a tolerance to even be okay with honestly.

 

[DonH 5,000+ posts]

on another note, i never understood why drop in recones never came with the cone unattached... its MUCH easier to assemble that way... simply drop the coil with spider. let that glue and set up. lay your bead on the former for the cone and lay a bead on the basket. drop the cone and viola. cone is set down nice without any sort of gap.

 

[slam 5,000+ posts]

ciaonzo is the shit. Dont doubt his knowledge... Plus he has a nice camera lol

 

[DonH 5,000+ posts]

ciaonzo is the ****. Dont doubt his knowledge... Plus he has a nice camera lol

so true!