Fs of Sub before/after break in?

[TheBetterMethod]

Hey guys,

I'm wondering, how does the Fs of a sub change after break-in? I've deduced that the break in process which results in lower, louder playing is due to a lowering of the Fs of the woofer. Can someone confirm this (or correct me if I'm wrong)? It makes sense to me because the suspension will have less tension/stiffness after break in and this would cause the cone to return to rest more slowly, at a lower Hz than it did before break-in (which is what the Fs is all about right).

My subsequent question is, If the above thought is true, how much can I expect the Fs to change after break-in? Would it be 1-2Hz, or more/less?

Please someone with knowledge help me out with this, I want to learn.

Thanks,

-TheBetterMethod

[Playa Named Joe]

I'm tuned into this too. I wonder the same thing. I want to make a t-line but not sure how accurate the measurements are after break in. I.e. DD and AQ, they only break in for one hour, which i wouldn't consider broken in all the way.

[TheBetterMethod]

Yeah, that's the thing. The manufacturers give us the numbers based on basically fresh woofers.

So if anybody has the answers, I'm sure there are more than just a couple of us that want to know.

[bassl0va]

I'm guessing that it will go down, but not much, just a few hertz.

But I'm positive that the change would be different for every woofer. Some companys may measure it with a broken in woofer, I guess you'd just have to ask the said company.

[STEvil]

T-lines are tuned to what you want them to be, not to the Fs.

Many people tune to the Fs because its easy. Its not correct, its easy.

Break-in will depend on your usage habits. If you run a lot of excursion it will happen faster and you will lose latent (spider mainly) dampening capabilities. If you dont have excursion happening then break-in will take longer. Realistically break-in is mostly a myth and a non-issue, so dont worry about it.

[TheBetterMethod]

Thanks for the input guys.

Anyone want to add?

[FiNaLaLmAsY]

My Soundstream SPLX124 has a FS(Hz)of 29hz. I know what it means but can someone give a good detailed explanation on it because i'm still kind of confused?

Thanks!

[kirill007]

The amount of hz that the Fs will drop depends on the woofer itself, every woofer has different changes in T/S parameters.

And there isn't really a true break in period, the spider will keep getting looser and looser, so Fs will keep dropping till the spider rips.

And how long you need to 'break in" depends on the user + the driver itself so giving a estimate is impossible.

Fs is just the resonant freqeuncy of the driver, like a sheet of metal has a resonant freqeuncy, the 'ting' you hear when you hit a sheet of metal.

[n8ball2013]

I'm guessing that it will go down, but not much, just a few hertz.

But I'm positive that the change would be different for every woofer. Some companys may measure it with a broken in woofer, I guess you'd just have to ask the said company.

I agree .

[OBI]

I know with the Lvl 5's and XL's, the FS of the subs are about 70hz out the box, and go down to 32-35hz after the spider has fully loosened up.