I've been avoiding posting in this thread because my cab isn't a LDS cab...
While lots of guys who play reggae do roll off everything above about 100hz, over the years I've found this not to be effective on stage. More and more I find myself attenuating the highs and high-mid range, but not all the way gone. Otherwise no one will hear any definition and no one can play with that on stage. On a record, you can get a way with it.
I've been carrying some decent sized rooms with my 15/6 lately. One room in particular, I didn't realize how loud I was out front until I heard a board recording and also an audience recording only to find nary a presence of my bass on the board but it loud in the recording out front. I know every one wants a 'big rig killer', but it may not be for everyone. What this cab does is present a lot more low than what you're used to hearing in a cab. Also the mids-uppers range is fuller due to the mid-speaker rather than the hole you get in a woofer/tweeter arrangement. This means a few things...first off, you don't need to feed it exaggerated lows from your amp (saving some of your headroom). Second, you'll hear some of the above the belt content a lot clearer.
I want a rig that's clear and clean and low. That's my trip. I want a full rich sound that doesn't have any distortion and I want to hit my low lows and have them represented accurately. This is as advertised. My bass' speaking voice is different from most of them. The multi-scale length of my instruments makes this possible, why have a rig that can't reproduce it? The fEarful does do it. Yes I'd like more than 300w into 8ohms for this setup. It can take the wattage, so why not have the headroom so I don't hear amp compression on my lows? I'm not hearing mechanical compression anymore...
The cab is a chameleon. It can do bright and punchy but it also has this ridiculous extended low range that I've never experienced in a cab. You don't have to EQ the lows into a cab, and once you play it, you feel like "ah, this is what I've been missing". I think its loud too. Are you playing in a metal band with 64564 marshall stacks? You might want two and a big power set up. I've been working with my LMII, and it's been plenty loud, but that won't stop me from looking for more headroom and less amp compression in the near future. And it won't stop me from having a 15.6+15sub in the future, because I'll have what amounts to a REALLY MONSTER rig that can do ANYTHING I ask of it. Besides I've always been of the mind that to have the most accurate clean sound, more speakers + plentiful power= pure tone.