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It is the same as before, you are just reading it in a positive way instead of negative. There was no number 2) btw...either way, first question you need to find out is what your customer will play on them. In the rest of the post it surely sounds like nothing low in which case tuning higher makes a ton of sense to give yourself some gain where he will want it. I like 20, but you don't have to go that low in this build. Output will mask the noise. As for the rules of thumb, you'd be surprised how many fall way outside of them. They are a shortcut for the uninformed and should be taken with a grain of salt at best. Science doesn't lie, art confuses things. I know which I prefer to follow... I understand liking the curve better if you tune lower, but you actually considered the BP curve which is laughably bad so why so worried about the frequency on the ported enclosure? 36" isn't long. You are thinking about this completely wrong though. Ignore port area and port length and instead solely focus on port resonance and port velocity. The actual shape/size whatever is irrelevant. That is irrelevant. Not a compromise. You state wall therefore all of your designs suffer the same fate loading wise. Sure there are differences mechanically due to the enclosure but if they are acoustically analogous then they are the same in that regard. Why is this not a concern in a BP to you? Laws of Physics are the same and while the environment is slightly different it is easy to calculate exactlywhat that means. I find it funny that you are worried that 36" for a large system sounds long, but are okay with 14". 14" for 3 18's sounds wicked nasty short to me. The reason for the negativity earlier is simple. The 4th order BP buys you NO advantages here. It is really not a good choice. The problem is that you've "heard" from others that have had success what they like. The bummer is none of them understand the success nor did they compare it with something else that would have worked better, yet they sing the gospel and you are happy to hear it. The opposite is true here, you aren't eager to hear what I say so only "see" the negative instead of the reality which included a lot of positive. Blame it on written/read word as it truly distorts reality to the eye of the beholder. It is your eye, you can choose to see what you want.

When no money is on the line I am great at it...wish the inverse held true

It's been my experiences that it's okay to go larger than recommendations per sub as long as you really watch the port velocity. Modeling kinda gave me an idea as to what was way to low on velocity. With those subs you could even set your limits on preferred velocity a little high from and audible stand point. With that much output the chuffing with be very hard to hear. With that in mind, the reason I would set the bar higher is that when going with a larger than recommend enclosure there's a point where you won't have enough velocity to keep the right amount of back pressure inside the enclosure causing the sub to be more prone to bottom out on the lows such at anything around 32hz & lower. One thought, and I am just tossing this out there is that you could just design a single enclosure for each of the subs. Stacking the 3 side by side and the front baffle would still give the illusion of a common chamber but the internals & port would be so reinforced on the inside it would diminish any flex from having such a large port. Designing a single enclosure for a single sub would be a lot easier to control your design. If you ever had any failure from one sub it would keep the others from shreading themselves apart as well being that there are an odd number of subs in the design. As far as a velocity cut off on the min, I really can't say. I use a different program when I model & design. But on mine I would try to not go lower than maybe a 6% mach. Without modeling this myself it may even go higher. Increasing the area would lower the percentage bit also makes the port longer, but you already are aware of that. In my opinion a 36" long straight port really isn't that bad. I've built & seen some that were well over 50" and without sacrificing anything other than space. If you got it use it...lol Tuning lower can flatten things out on the response curve but generally I don't like going lower that 26hz to achieve that. The actual gain in the cabin on tuning would have to be answered by the meter. I know in my little ranger on just a blow through, if I tuned the enclosure @ 26hz. my peak would be at 32hz. which for me was awesome because I listen to a mix of rock & rap. With a flat response curve I could play a variety of songs during demo and still turn a lot of heads.

Zoom Zoom!

Picking up my Zoom Zoom Saturday!

Everything's better with nitro

Bummer too you can't trust anything DSS says I'd avoid those like the plague.

Let there be light!