Wow, can't get over how much mid bass that OS pro has. It's not like it doesn't have any low bass (not LFE obviously), hell it matches a G Horn at 32 hz, which also matches the sealed SI 24 at 32 hz.
With music this thing must be able to beat the living crap out of your chest. I was impressed with the Growler but this thing beats it by 10 db's. I was thinking that someday I'd have to pay someone to build me an Othorn, but it looks like there is no need with this beast available.
I was actually thinking about buying the OS Pro before I built the Othorns. However, after the shipping cost of the OS Pro was taken into account, I could build two Othorns for the price of a single OS Pro.
If you get a couple OS Pro's, you better not power them with a weak sauce amp like a CV-5K or iNuke/IPR in stereo or something lame. That would be a crime to what they're capable of!