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Lol I should just send those things lol. With my new setup, it shouldn't be a problem. 4 FI Q Neo 12's on 2 DC Audio 3.5k's. But I've got friends that just piece together stuff they buy off of craigslist and I was just curious if I could use the DD1 on their crappy setups. Like my one friend who has 2 18" Kicker Comps in the back of a Monte Carlo running off a Hyphonics Brutus amp.... turned way down I'm assuming. I'm not touching that one with a 10 foot pole lol. Thank you for your time and your reply sparkymedina! I appreciate it!

If the sub is flopping around like a fish out of water when your playing higher notes then you are unloading, unloading will typically be caused by 1 of 3 things or a combination of those things. Too much power, to much port, or playing out of tuning frequency. I personally don't like the port area by wattage method because things just like this happen, and that is why I prefer the per cube method. It only seems to work good in more of your SPL style builds where your only playing 1 frequency. You get to a point where too much is too much and you start to lose output. Ideally you want to take the sub(s) cone area, xmax, enclosure size, and applied power into consideration when figuring out port area. For a free calculator WinISD is great there is a graph for port velocity on there, its worth downloading and learning, or if you need something more basic Torres works decently well too but wont give you any port velocity numbers. Port velocity isn't that bad as long as you stay under 10-12% speed of sound. Depending on the setup and how the sub(s) and port are oriented you may not hear port noise at all even if you have a really high port velocity. For example a a box in the trunk with everything firing towards the rear of the vehicle.

The softer X spider is going to change a lot, the X series is more tuned for the low end, not so much the Zv4 or Zv5 series though they can play low. The old Zv3 series use to be more sought after for SPL and because Sundown didnt have anything similar in their current line any longer they came out with the U series that had a very simlilar sound to the old Zv3 series. The X series has a distinct sound compared to any of the Z series (current generation or old) and using the X spider is going to be a lot softer of a suspension compared to the Zv3, Zv4, and Zv5 so it will have a lower fs. That being said if you are truly giving the woofer an actual 2000-2200 rms you are kind of large on the port area since the Zv3 is something like 34sq inches total in a 2.5 cubed net. So your at 40sq in a 2 cubed net and over powering it. A box tuned in such a low region such as 32 hz with a lot of port volume is going to have a significant drop off in the higher frequency ranges and that will also change from woofer to woofer that you install in that said box. Personally in daily applications Id say around 14sq per cube dependent on power. Typically you would increase box volume and port area to increase enclosure efficiency if you're lacking on power. Ideally you would want to run T/S parameters on the sub since its basically a frankenwoofer. Have you adjusted any crossovers on the amp such as changing the LPF? Did you somehow change the crossover on the deck to something lower? What is the sub doing physically wise when you play music with these higher frequencies? That could tell you a lot right there.