Does this qualify for a number?
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Greenboy designed 1515/66. (Posted this in the Fearful thread as well.) Huge sound! As with the 15/6 the B string of my Lakland sounds incredibly powerful and focused and the mids are warm and clear. I am running about 1600 watts triamped using 2 poweramps and a rack mounted DSP.
Most striking is the weight of this cabinet. I don't have any other option to weigh something this big except to use the highly scientific bathroom scale method. I did it a couple times and came up with...
89 pounds!
Wow. I thought it weighed more than this but realise thats probably due to the size effecting this perception. ( Wrapping your arms around it and carrying it makes one perceive more weight.) However, it is less than 90lbs and I still can't get over it. My EBMM 2-12 weighs more than this!
The SPL to weight/size ratio for this cab is totally off the screen. I feel confident in saying that there is nothing commercially available that could possibly best it in this regard.
Unfortunately I havent been able to really fire this up as any volumes above 2 make the windows rattle and cause the entire room to vibrate.

I am not playing in a band right now but it's obvious that this cab would thump extremely hard if I wanted it to and I can move it around with ease.
Much thanks and appreciation goes out to Greenboy for designing this for me.