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Nerd scale 1000000000 billion!

Nerd indeed. There is an angel in your picture.

Jealous.

2800w or 3500w*...it doesn't matter as the difference will not be something your ear detects. The biggest concern you should have is maintaining voltage. Last thing you want to do is create a problem due to a lack of supply. One other comment: box rise doesn't exist. Sure there is an impedance curve, but it is not only rise. Competitors may talk about box rise correctly if they are discussing a single frequency; however, even most of them use the term incorrectly and have no idea what they are talking about. Of course if you a referencing the curve and want to understand it I would encourage you to measure it yourself. *note, I didn't pick either of those wattage numbers because that is what I expect you will get but only to highlight that it isn't something you should worry about.

Fi built the passive radiators I'm using in my Jimmy to match my XCON after getting Aaron and Marks blessing. I'm certain they could build some for you but it will definitely take a lot more time and probably cost more as well. If you can get the PSI's faster and for a reasonable price I would. I beat myself up trying to figure the weight needed to get the tuning I wanted as well. The problem was that I didn't have any known T/S or any data at all for the PR's to do any useful calculations. I ended up mounting them backwards and tuning them. The subwoofer cone movement works the same with PR's as it does with a standard ported enclosure. The sub moves the least amount at the tuning frequency. I added weight and adjusted until it was tuned ever so slightly lower than my target frequency. Then I used a little bit of silicone to help ensure the bolt wouldn't back out then mounted them correctly. They're still running great about 3 years later and the tuning frequency is still right where I had adjusted it to (30hz). I wish you were closer so I could demo it for you. I absolutely LOVE the way it sounds as does everyone I have given a demo to. I'm not certain that how I did it is perfectly correct but it worked fine for me.