PRV 15SW2000

[Rich4349]

Which designs is the PRV 15SW2000 suitable for?

[Bill Fitzmaurice]

https://billfitzmaurice.info/forum/viewtopic.php?t=276

[Rich4349]

Booooo

[Seth]

Not such a huge no-no, being as it's at least one of the recommended drivers. However, I don't have it in me to go through all the plans to spit the answer out.
T48 for sure, though.

Rich, you're a tried and true regular around here. You don't have all the plans?

T48 Club Installation

[Rich4349]

I do, but I'm such an old timer that most of my plans are from 2009, so they are far from as up to date as they could be. I admit I was too lazy to open each plan and see which ones call for the 3015LF or Lab 15. (Speaking of which: wow, the Lab 15 sure beats the hell out of the 3015!)

[Wylandright206]

I do, but I'm such an old timer that most of my plans are from 2009, so they are far from as up to date as they could be. I admit I was too lazy to open each plan and see which ones call for the 3015LF or Lab 15. (Speaking of which: wow, the Lab 15 sure beats the hell out of the 3015!)

I have to agree the lab15 is louder, however it is seriously bandwidth limited compared to the 3015lf in the t48, and really doesn't take advantage of its higher excursion. The prv 15sw2000 is a fantastic in between. Louder than either, goes almost as low as the 3015lf and uses its excursion better than either of them.

If you are building a super wide t48 the 3015 really starts to spread it's wings, it sims very nicely. However so does a pair of those prv drivers. A pair of those in a 36 inch dualie would put up some absolutely insane spl numbers. Louder than most high end double 18s, and bordering much more inconvenient high performance horns.

In summary, if you're building skinny titans, use the prv driver, if you are building 24 inch wide, you have a lot of options but I would still recommend the prv driver, as it is a very high performer for the price tag, but if you're going 30 inches or wider, use the 3015lf. If you're a glutton for pain and want to build a monster with no regard for the health of your back, put two of those 15sw2000s in a 36 inch titan sharing the rear chamber. Truly astonishing max spl in hornresp. The 15sw2000 is a remarkable driver and I don't understand how it's being sold as cheap as it is. We slapped one on a danley th115 and it was easily keeping up with the 15tbx100

[Wylandright206]

I will add, the 12 inch version of the prv woofer is equally as devastating in pairs in a 30" t39, minus roughly 10hz give or take. And that's an even more compact package! I have never found myself wanting a t39 with this shop full of 48s but MAN

[Rich4349]

"The prv 15sw2000 is a fantastic in between. Louder than either, goes almost as low as the 3015lf"

I thought the enclosure dictated extension?

[Seth]

"The prv 15sw2000 is a fantastic in between. Louder than either, goes almost as low as the 3015lf"

I thought the enclosure dictated extension?

Primarily, yes. However, each model driver will behave slightly different.

There aren't too many to compare in the SPL tool, but here's two different drivers in the same cab, a 24" wide T24...



If they all behaved the same, driver choice would be arbitrary.

[Wylandright206]

"The prv 15sw2000 is a fantastic in between. Louder than either, goes almost as low as the 3015lf"

I thought the enclosure dictated extension?

This is true if you ignore the mechanical compliance characteristics of the driver. Not all drivers have the same motor, voice coil structure, and cone/surround material. A driver with a higher qts and lower overall motor force is going to have a harder time controlling its cone in a given enclosure, and this can manifest as a perceived higher sensitivity down lower. In reality it's simply the driver having less control of the cone.

These sorts of front loaded bass horns are different than a traditional ported enclosure because we are using the air in the rear chamber as a spring to manipulate the mechanical compliance characteristics of the driver, that then has its other face loaded with a cone of air, making each stroke of the driver more efficient by coupling with more air.
The lab15 has a suspension system and resonance not optimal for the t48 so it needs a smaller rear chamber to compensate, but even then it's leaving excursion on the table. In the 20 inch titans with no reducer the lab15s would need a hpf of 28hz to use all of its xmax at pmax. And it would make no difference compared to using a 33hz hpf. It just doesn't take advantage of that nearly 12mm xmax. The prv driver in that enclosure will use its xmax in a way that it will achieve xmax and max simultaneously with a 35hz 4th order hpf.

[Wylandright206]

"The prv 15sw2000 is a fantastic in between. Louder than either, goes almost as low as the 3015lf"

I thought the enclosure dictated extension?

This is true if you ignore the mechanical compliance characteristics of the driver. Not all drivers have the same motor, voice coil structure, and cone/surround material. A driver with a higher qts and lower overall motor force is going to have a harder time controlling its cone in a given enclosure, and this can manifest as a perceived higher sensitivity down lower. In reality it's simply the driver having less control of the cone.

These sorts of front loaded bass horns are different than a traditional ported enclosure because we are using the air in the rear chamber as a spring to manipulate the mechanical compliance characteristics of the driver, that then has its other face loaded with a cone of air, making each stroke of the driver more efficient by coupling with more air.
The lab15 has a suspension system and resonance not optimal for the t48 so it needs a smaller rear chamber to compensate, but even then it's leaving excursion on the table. In the 20 inch t48s with no reducer the lab15s would need a hpf of 28hz to use all of its xmax at pmax. And it would make no difference compared to using a 33hz hpf. It just doesn't take advantage of that nearly 12mm xmax. The prv driver in that enclosure will use its xmax in a way that it will achieve xmax and max simultaneously with a 35hz 4th order hpf.

[Wylandright206]

I thought the enclosure dictated extension?
[/quote]

This is true if you ignore the mechanical compliance characteristics of the driver. Not all drivers have the same motor, voice coil structure, and cone/surround material. A driver with a higher qts and lower overall motor force is going to have a harder time controlling its cone in a given enclosure, and this can manifest as a perceived higher sensitivity down lower. In reality it's simply the driver having less control of the cone.

These sorts of front loaded bass horns are different than a traditional ported enclosure because we are using the air in the rear chamber as a spring to manipulate the mechanical compliance characteristics of the driver, that then has its other face loaded with a cone of air, making each stroke of the driver more efficient by coupling with more air.
The lab15 has a suspension system and resonance not optimal for the t48 so it needs a smaller rear chamber to compensate, but even then it's leaving excursion on the table. In the 20 inch t48s with no reducer the lab15s would need a hpf of 28hz to use all of its xmax at pmax. And it would make no difference compared to using a 33hz hpf. It just doesn't take advantage of that nearly 12mm xmax. The prv driver in that enclosure will use its xmax in a way that it will achieve xmax and pmax simultaneously with a 35hz 4th order hpf.
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[Wylandright206]

I thought the enclosure dictated extension?

This is true if you ignore the mechanical compliance characteristics of the driver. Not all drivers have the same motor, voice coil structure, and cone/surround material. A driver with a higher qts and lower overall motor force is going to have a harder time controlling its cone in a given enclosure, and this can manifest as a perceived higher sensitivity down lower. In reality it's simply the driver having less control of the cone.

These sorts of front loaded bass horns are different than a traditional ported enclosure because we are using the air in the rear chamber as a spring to manipulate the mechanical compliance characteristics of the driver, that then has its other face loaded with a cone of air, making each stroke of the driver more efficient by coupling with more air.
The lab15 has a suspension system and resonance not optimal for the t48 so it needs a smaller rear chamber to compensate, but even then it's leaving excursion on the table. In the 20 inch t48s with no reducer the lab15s would need a hpf of 28hz to use all of its xmax at pmax. And it would make no difference compared to using a 33hz hpf. It just doesn't take advantage of that nearly 12mm xmax. The prv driver in that enclosure will use its excursion in a way that it will achieve xmax and pmax simultaneously with a 35hz 4th order hpf.
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