Transmission Line with Kappa Perfect??

[ParadigmDawg]

The little sealed sub that Andrew is building for me would require about 8kW to exceed its conservatively rated xmax at 10Hz and even more above that!

Not that I will power it to the max.

 

[haraldo]

The little sealed sub that Andrew is building for me would require about 8kW to exceed its conservatively rated xmax at 10Hz and even more above that!

Not that I will power it to the max.

wohooooow, that's what I call a tough driver

 

[ParadigmDawg]

It's supposed to be the second best driver out there but what do I know? I just keep sending him money when he says he needs more

wohooooow, that's what I call a tough driver

 

[haraldo]

It's supposed to be the second best driver out there but what do I know? I just keep sending him money when he says he needs more

I'm sure you'll get sth incredible !!!!!!!!!!!

 

[ParadigmDawg]

Got some little driver called a TC3k, I bet I am really just paying for his time at Texas A&M

I'm sure you'll get sth incredible !!!!!!!!!!!

 

[haraldo]

It's supposed to be the second best driver out there but what do I know? I just keep sending him money when he says he needs more

If it's the second best......

Do you know what's the best driver out there

 

[ParadigmDawg]

Well, he told me but I don't remember. Let's pull him in here and see.

If it's the second best......

Do you know what's the best driver out there

 

[TLS Guy]

Not to derail your amp discussion but what type of power requirements are needed for a TL such as the Kappa TL design you discuss in this thread? I would assume the efficiency of such a design is similar to ported and you would not need tons of power to drive the Kappa's.

Yeah, 300th post!

Well the TL has to use two drivers. The sensitivity of one driver is 89db 2.83 volts 1 meter. So if you use two drivers next to each other the sensitivity goes up by 6 db, so that gives the sensitivity of the two drivers at 95db 2.83 volts 1 meter. The line should augment the sensitivity by 4 db over one and a half octaves, from 25 to 75 Hz. So that gets you to 99db 2.83 volts 1 meter.

So the line with two drivers would be10db more sensitive then a single driver in a sealed or standard ported enclosure. So it would require 1/10 of the power for the same spl.

This is inline with the observations of my bass lines. The total power devoted to the large line is 400 watts, but the amps don't break a sweat, and yet they threaten to demolish the room in the canon shots of Master and Commander.

 

[Warpdrv]

If it's the second best......

Do you know what's the best driver out there

I'll tell ya, its the next step up the line in the now defunct TC-Sounds driver line.

The drivers I have are the TC-2000, next are the TC-3000, and the top of the heap is the LMS-5400... There was a small amount of time there was a driver in the middle I believe, but they seemed to be more like beta drivers.

I am sorry I never bought a handful of LMS drivers, but I wasn't into bass as much at the time TC-Sounds went under, they stated they were going to reorganize under the name AudioPulse, but that didn't go very far.

Personally I hope that when they sold off the copyrights that someone will once again produce those drivers, but I thought I read that Thilo kept those rights for himself, and that they will be coming back. I guess we'll see..

 

[haraldo]

So the line with two drivers would be10db more sensitive then a single driver in a sealed or standard ported enclosure. So it would require 1/10 of the power for the same spl.

so what does that do to distortion from the Kappa's, obviously a lot, but how much?
Do you have any idea about expected distortion figures
And of course, much less strain an amplifier

I am sorry I never bought a handful of LMS drivers, but I wasn't into bass as much at the time TC-Sounds went under, they stated they were going to reorganize under the name AudioPulse, but that didn't go very far.

Partsexpress still seem to carry the Audiopulse line
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=293-622

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=293-620

Not cheap though...

 

[TLS Guy]

so what does that do to distortion from the Kappa's, obviously a lot, but how much?
Do you have any idea about expected distortion figures
And of course, much less strain an amplifier





Partsexpress still seem to carry the Audiopulse line
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=293-622

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=293-620

Not cheap though...

On the 12 inch Fs and Qt would not allow for a line with extended bass. So you would have to use the 15 inch. VAS is 30 % greater, so you might get away with one driver but I doubt it. You likely would have to use two and the enclosure size would then likely get way over the top.

The unique thing about the kappa perfects is the ability to have three sets of parameters from one driver. The mid Q insert lines up the parameters really well for TL and ported enclosures for that matter. If you want a more compact ported enclosure, then the low Q insert is for you. If you want a good sealed sub, then the no insert Q is about as good parameters as you will see.

Talk about "best driver" is nonsense. It is all in the application and how the application is executed.

As far as distortion, form the TL, yes the drivers obviously have less excursion for the same spl, but on top of that the distortion at the port is significantly less than ported. When you add this to the fact, that properly damped a TL is non resonant, you come to understand how they achieve deep natural effortless bass.

 

[haraldo]

Guess this is like what we always known

You want it good, able to play load with low distortion and not huge amplifiers, it must be BIG, There are no free lunches

TLS Guy...... Thanks a lot for going so incredibly much into detail on this