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A single kerf flared labyrinth port common chamber for a pair of 12" SSA Icons 4.25cf3 plus displacements tuned at 30hz

Cross the Qs around 50-60hz. You'll thank me later. whys that? and whats a good midbass speaker to pick up at 50-60hz then?Of all the drivers I've used none sounded good crossed at 80hz, once I dropped them to 50-60hz then both the bass and midbass were clearer and sharper. Drums felt like a precision impact to the chest instead of a bunch of rumbling and vibration. For what it's worth I've had fi bl, sundown sa 12, SSA dcon icon xcon, all in various alignments. This is just my anecdotal advice, but I would be very surprised if you weren't happy with the difference in sound. As to midbass drivers the only one I've used is the exodus exanarchy but they're optimal in ported enclosures and I'm not sure if you can still find them anywhere. . try searching the forum for midbass drivers, you aren't the first to want midbass.

The reason people brought it up is that advising a SSF point is based on the enclosure tuning, and if the enclosure tuning is off than the SSF won't be protecting the driver from over-excursion as much. Meaning the likelihood of the driver being ruined increases. We forum members are spending our time to help you and all that we ask in return is that you don't waste our time by making sure the tuning is in fact what you believe it is. It's not hard to verify and choosing not to is just being lazy. It would literally take you five minutes. Good luck with your build.

If you already have a 2500, the extra electrical load of another 1kw might drop voltage enough to negate the power jump, unless your electrical is setup to handle that level of power. Going from 12" to 15" will give you the boost in output, that amp swap may or may not even be noticeable at that power level.

Depending on the box you have it in, the 3500 would be plenty. I am running a zcon 15 on a BC3500 myself.

For the purpose of setting the SSF it sure doesn't hurt to find out the exact tuning frequency AND it's simple to do. The process requires only a set of test tones and about five to ten minutes of your time. First off turn your SSF all the way down then set yourself up to play the tones, start at about 40 to 45hz and turn the volume up until the sub is moving enough to easily see. Then change tracks going down one frequency at a time watching the cone's movement closely as you go down. You're looking for the cone to be moving the LEAST amount and when you see it start moving more again you've gone below the tuning frequency. Back up one track at a time until it goes from moving the least to moving more again and keep that up until you've zoned in on the frequency it's moving the least and THAT is your real tuning frequency. Now, for example lets say it is 34hz as you so adamantly claim, then choose a frequency that's three to five hertz lower than the tuning frequency (i.e. 31-29hz). Now turn the SSF up until the movement of the cone is half of what it was when you started. Your SSF is now properly set. No one is trying to be demeaning by what they're saying about your enclosure and whoever built it. They're just trying to help you understand that it may not be as perfect as you first assume.

I'm not interested in ssa subs..almost every time some recommends a sub 90% of the time it's a ssa sub that's why I asked the question in the IA section

What's up Jeff? Welcome to SSA. Damn college kids have more money than me...

The rest of the goodies showed up

Some goodies showed up. 3/0 electron beam and some 3/0 lugs. Xspower psc60 intellisupply charger and 4 mechman 370s ordered from ssa.

This is going to be interesting I promise!!!

Power will be the Q1-3500d.1 and the Q4-90.4 Subs will be Xcon 15's maybe 18's IDK yet...will be a back seat delete also looking at the evil series as a option as well This project started as two 10's and has gone way over my toy budget already..But fun is priceless right?

The victim.....