Great stuff, thanks for the efforts.
My problem is in the assumption that each SI-18 (or equivalent) is equally powered.
The SI reference being used for these calcs was powered by a K10 on a 220V/50A line.
It's not realistic to assume that (for example) a system of 8 of them would each have its own K10/220V/50A power plant.
It's also not realistic to assume that a system of 1-SI-18+K10/220V/50A would last more than one sitting of WOTW in my 3500 cubes HT at any sort of spirited playback level.
I think that your formula will only work accurately with commercial subs, using a commercial subs results as the reference.
I apologize for this post in that I usually I have some alternative choices or an equalizer to the existing formula, but in this case I don't because I haven't had enough time recently to do much extra-carricular thinking. I've just been watching the greatest MWB ever made and enjoying the heck out of it.
Anyway, keep up the great work and hopefully this will evolve into a world class standard for actual use in actual rooms... something that has always been sorely lacking for the general sub-buyeing public.
Damn you Bosso...good point.
You're right, there's a lot more variables when it comes to DIY...power, amp rolloff, box size, etc.
As I mentioned before, it's not a perfect metric, and not meant to be. However, for DIY the power piece could have a significant impact on output and the resulting SI conversion ratio.
For now what this means is that commercial scores are pretty good. For DIY, the scores are more of the 'max potential' of your HT system. Some that use fp14000 are probably very close to max. Those that use EP4000s, could be down a bit depending on driver, box, efficiency, etc.
I still think it puts folks in the general ballpark (and serves the purpose of this thread) to give others an idea of their ULF perspective, but agree that DIY could use some more refining.
Interested in hearing thoughts from others on how to make DIY more accurate...(again it won't be ever truly representative, but we could probably figure out a way to get it closer to commercial scoring).