So after weeks of reading almost every thread on AVS that contained any reference to the IXL-18, UXL-18, SI 18D2, and Dayton 18HO, I still cannot decide what to use. Here are the basic parameters I'm working with:

1. I cannot do dual subs. Definitive no from wife so it's just not an option.

2. Limited enclosure size, max size of 4 cubic feet of internal volume.

3. Could do dual-opposed (in a total of 4 cubic feet) but not sure it would help much at all.

4. Max SPL is of no interest to me, low distortion and deep extension are

I've been looking at all the measurements on data-bass but could use some help understanding the max burst, basic response, and maximum long-term output graphs. It seems like max burst is peak db for a short time, like a single explosion or something along those lines and max long-term is maximum spl over a long period of time. So then how does basic response relate to those three? Also, when comparing the Dayton in a 4 foot enclosure to the UXL 18 has much higher spl than the dayton or the SI when looking at the system list but on the charts has lower spl. Basically, I'm lost and confused

The IXL-18, SI, and Dayton are, for my purposes, the same price so cost between them is irrelevant. The UXL-18 is almost double the cost of the other 3 and I could definitely afford to do so but since I can't seem to interpret the graphs I don't know what I would gain.

Any advice that would help me clear my head would be greatly appreciated.

1. I cannot do dual subs. Definitive no from wife so it's just not an option.

2. Limited enclosure size, max size of 4 cubic feet of internal volume.

3. Could do dual-opposed (in a total of 4 cubic feet) but not sure it would help much at all.

4. Max SPL is of no interest to me, low distortion and deep extension are

I've been looking at all the measurements on data-bass but could use some help understanding the max burst, basic response, and maximum long-term output graphs. It seems like max burst is peak db for a short time, like a single explosion or something along those lines and max long-term is maximum spl over a long period of time. So then how does basic response relate to those three? Also, when comparing the Dayton in a 4 foot enclosure to the UXL 18 has much higher spl than the dayton or the SI when looking at the system list but on the charts has lower spl. Basically, I'm lost and confused

The IXL-18, SI, and Dayton are, for my purposes, the same price so cost between them is irrelevant. The UXL-18 is almost double the cost of the other 3 and I could definitely afford to do so but since I can't seem to interpret the graphs I don't know what I would gain.

Any advice that would help me clear my head would be greatly appreciated.