is there such a thing as but too much?

[chrisb]

Not DIY, but you gotta read the specs. Lycan UlricSpecs

[m R g S r]

SO it's not THAT big at only 24x38x32". But that weight is insane!!! 712lbs! Wtf!

[tomi]

Only the one 18" though?
The PA company I work for recently delivered one of these to the home of a private individual:
JBL :: Product

[m R g S r]

Theyre completely different. One is -1db at 17 Hz one is -10db at 26Hz
I know the JBL may be much much louder but they're still different beasts!

[Etocynned]

I remember the first time i came across this:

Krell Industries, Incorporated, America's premiere manufacturer of high-end audio equipment: award-winning amplifiers, preamplifiers, CD players, DVD players, surround/sound processors, loudspeakers

kinda beastly, and it comes in black!

[revboden]

What a catastrophic waste of Baltic birch.

edit: and you can build one for ~3,000$

recipe:
1 LMS Ultra 5400
a buttload of ply
2500w amp

[BP1Fanatic]

That sub is NOT worth $15K!!!

[kelticwizard]

Checking out these specs, I see they give a max SPL of 121 dB and -1 db at 17 Hz. I presume that means a max SPL of 120 dB @ 17 Hz.

Since this is a sealed woofer, all of the spl has to come from the speaker cone-there is no vent to augment the bass output.

Following is the chart from Richard Small for the volume of air a cone in a sealed enclosure must move to achieve certain dB levels. The volume displaced equals the area of the cone, (Sd) times the excursion of the speaker, (from center to maximum outward point).

Here is the chart in square inches and in square centimeters:

[kelticwizard]

Now to find the cubic inches necessary to produce 120 dB @17 Hz. The chart does not go that high at 17 Hz. But not to worry-we know that it takes four times the displacement volume to produce a frequency at the same volume level one octave lower. So we find the cubic inches required to make a frequency of 34 Hz @ 120 Hz and multiply that displacement by 4.

We see that 37 Hz takes about 128 cu inches displacement to produce 120 Hz, so 34 Hz probably requires about 140 cu inches. 140 cu inches times 4 equals 560 cu in, so to produce a 17 Hz sound at 120 dB requires about 560 cu inches for a sealed woofer to move.

To find the one way excursion, we divide 560 cu inches by the cone area of the 18 in woofer. We don't have the exact spec, but the Eminence Sigma 18 inch has a cone area of 176 sq inches and this 18 inch is likely to be similar.

560 cubic inches divided by a cone area of 176 sq inches equals a one way excursion of 3.18 inches.

I am not familiar with the voice coil or excursion with the woofer in this particular unit, but 3.18 inches for one way excursion is far more than any woofer I have come across, not that I have seen them all.

So I am somewhat suspicious of this unit's specs.

[m R g S r]

Xmax of the 5400 is 31mm I believe? I'm unsure of X mech...but I don't think its 3 inches in one direction. Maybe peak to peak...