[fackamato]

I just modeled an Audiopulse LMS-Ultra 18" sealed box with linkwitz transform, see below:



The box pressure reaches 174.6 dB around 17Hz, will this damage the cone? Otherwise the response looks very good to me, except that you need approx. 6500 watts to power the beast.

:scared:

 

[Mike P.]

I don't remember the specs of the LMS-18 offhand but I highly doubt it will handle 6500 watts.

Edit: It has a recommended power handling of 5000 watts according to the specs on the website.

http://www.audiopulse.com/products/subwoofer-drivers/lms-ultra/

 

[fackamato]

I don't remember the specs of the LMS-18 offhand but I highly doubt it will handle 6500 watts.

Edit: It has a recommended power handling of 5000 watts according to the specs on the website.

http://www.audiopulse.com/products/subwoofer-drivers/lms-ultra/

It handles 5000 watts RMS according to http://www.audiopulse.com/products/subwoofer-drivers/lms-ultra , I'm not sure but I think it would be okay in reality.

Of course, the next step would be to find an amplifier...

I'm just theorizing.

 

[Mike P.]

I'm not familiar with that program you are using. What size cabinet did you model?

 

[fackamato]

I'm not familiar with that program you are using. What size cabinet did you model?

It's Basta!, found at http://www.tolvan.com/basta/ .

Vb: 56.15L, no fill
LT: 20Hz q 0.7
Source: 80 volts, 1 order hp @ 16Hz

Of course, if one would go to up to 100L and 50% fill you could get away with 2800 watts, giving the same output..

 

[Ricci]

Ummm in a word no. The LMS (I have one) will handle more power thermally than nearly any other driver I can think of outside of straight up car audio SPL woofers. It will play fine wit a 5kw amp. However it will NOT handle that much power in the low bass. The driver will destroy itself mechanically with over excursion. Worry about mechanical handling not thermal.

 

[fackamato]

Ummm in a word no. The LMS (I have one) will handle more power thermally than nearly any other driver I can think of outside of straight up car audio SPL woofers. It will play fine wit a 5kw amp. However it will NOT handle that much power in the low bass. The driver will destroy itself mechanically with over excursion. Worry about mechanical handling not thermal.

Excursion is not a problem in my simulation, there's a 1st order HP filter at 16Hz which will take care of that (just look at the curve).

Still, all in theory (mostly because the driver is so expensive..)

 

[Ricci]

Well yes if you use a HPF and a tiny 57L box then on paper yes. Probably with a lot of power compression though. Drop the power to around 4KW in and there's really no need for a HPF. However keeping the power around 3000w and making the enclosure a bit bigger like 100L seems to make a little more sense. I don't like a HPF on sealed subwoofers for the most part. A little bit of electronics roll off and watching your enclosure volume and power available should allow you to run safely without one.

 

[Pinhead-227]

Why sealed? You could drop the power requirement drastically for the same SPL if you ran an EBS/LLT...