I've been looking for T/S perams for the FI BTL 18.

Searching to no avail I need some help.

The reason I need the numbers is to plug them into Termpak so I can

design an enclosure for a forum buddy.

Any help would be very much appreciated.

I need the following:

fs (in hz)

Qts

Vas (in cu.ft.)

Xmax (in inches)

znom (depends on coil config. I am aware)

Pe (rms watts)

Spl (in db @ 1w/1m)

Which BTL? What year?

Well......Actually the design is for 2~18" DC XL

Was told to just use the BTL perams because the numbers I need apparently do not exist.

Upon searching the FI sites, I can't find anything.

Why nit get their ts params?

I tried, was told by "Rusty" the missing numbers I need don't exist.

I need the VAS & SPL to fill in the blanks for the actual XL.

He told us to use the BTL perams.

Pft is all I have to say lol

It seems like T/S perams or "specs" are taboo for people to talk about.

Generation 2/ UFO style magnets

Kinda blows my mind how we call rusty and get no where.

Sean had a good point, he says most spl subs don't have ts parameters because graphing large motor-ed subs gives weird graphs

So what now?

Do what Yoda says-

Do Or Do Not

There Is No Try.

Sean had a good point, he says most spl subs don't have ts parameters because graphing large motor-ed subs gives weird graphs

then go off of DC's suggested enclosure sizes.

Or like MJ.....Just beat it!

I tried, was told by "Rusty" the missing numbers I need don't exist.

I need the VAS & SPL to fill in the blanks for the actual XL.

He told us to use the BTL perams.

What parameters do you have for the XL ?

Depending on what parameters you have it might be possible to calculate out the Vas & sensitivity.

If you are going to go through the trouble of modeling, it is a complete waste of time to use the T/S parameters of another sub, no matter who tells you....

Also, saying a sub is "special" and doesn't model well is only true if you don't know how to use your modeling software....

Wait, an outsourced version of an older design is supposed to use the same parameters?

Wait, an outsourced version of an older design is supposed to use the same parameters?

Thats what I was thinking.

More like wishful thinking me thinks. lol

I tried, was told by "Rusty" the missing numbers I need don't exist.

I need the VAS & SPL to fill in the blanks for the actual XL.

He told us to use the BTL perams.

What parameters do you have for the XL ?

Depending on what parameters you have it might be possible to calculate out the Vas & sensitivity.

All I had to work with was on DC's site and what Rusty told Mac N Cheese

If you are going to go through the trouble of modeling, it is a complete waste of time to use the T/S parameters of another sub, no matter who tells you....

I understand that,

this is why I was leery to try to use another drivers specs.

I know all subs are different and have their own specs kinda like "DNA" for the sub.

It seems like the T/S Parameters are getting harder and harder to find for modeling sub enclosures.

If you aren't trying to pinch pennies and want dead on specs google Redrock Acoustics. Patrick can give you full small and large t/s parameters with BL, THD, thermal, inductance, and a few more graphs off the top of my head for around 125 bucks.

If you aren't trying to pinch pennies and want dead on specs google Redrock Acoustics. Patrick can give you full small and large t/s parameters with BL, THD, thermal, inductance, and a few more graphs off the top of my head for around 125 bucks.

Good info.

I +1 ya on that for the info share!

But as said before if the subs have more than 20-25 BL T/S parameters will be worthless to you as they will not model correctly. Typically high BL subs will generate a peak at tuning frequency will a shallow knee below tuning.

Wait, an outsourced version of an older design is supposed to use the same parameters?

Thats what I was thinking.

More like wishful thinking me thinks. lol

Why does logic always get in my way?

If you aren't trying to pinch pennies and want dead on specs google Redrock Acoustics. Patrick can give you full small and large t/s parameters with BL, THD, thermal, inductance, and a few more graphs off the top of my head for around 125 bucks.

Good info.

I +1 ya on that for the info share!

He's a super cool dude and was personally recommended by Dr. Klippel as "the authority" for testing in the U.S. He has one of the newest Klippel testing equipment that they produce.