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Shizz and Stefan are correct, there's no such thing as "box rise". Impedance simply varies with frequency and while yes the enclosure does affect the shape of the impedance curve it's not the only factor. Impedance will vary with frequency due to the behavior of the driver, it will also increase as power is applied to the driver due to heat, etc. Another thing people confuse is the difference between Re and nominal impedance. Re, also known as DCR or DC resistance, is the resistance of the coil with a DC signal. Re is one of the Thiele Small parameters listed by the manufacturer. It is typically a bit less than the rated nominal impedance of the coil. For example, a 2ohm voice coil might have a Re of 1.6ohm. So some uneducated fellow sees this and says his amplifier is wired to 1.6ohm and that "box rise" causes the impedance of the driver to be 2ohm. He would be wrong. Since, as was mentioned, impedance varies due to several different factors over the entire audio bandwidth there is no one "impedance" to call a driver. A 4ohm driver isn't 4ohm at every frequency. Nominal impedance is basically an average value of the load presented to the amplifier over the intended operating bandwidth (outside of resonance, where there is a huge peak in impedance). Re and nominal impedance are not the same thing, and generally speaking when you hear someone say they are "wired" to odd values like .7, 1.6, etc it's because they don't understand the difference between Re and nominal impedance.

What you're thinking of is impedance vs frequency. Impedance doesn't simply rise, but rather varies with the frequency. Honestly there isn't any real good reason to even bother calculating it, or worrying about it for the average person. Though you can use a multi-meter and clamp meter to measure the amperage and voltage at a specific frequency to find the impedance. You would continue doing this at different frequencies to make a graph, or chart. The enclosure alignment directly affects the impedance plot. Here's an example of why people think it's important for them, but perhaps isn't: Wired subs to 1ohm for max amp power (1000watts), so it's super loud. In enclosure xxx at 40hz impedance is 3ohms, so instead of 1000watts the driver is only seeing ~250watts. In enclosure yyy at 40hz impedance is 2.5ohms, so it's 400watts. So enclosure yyy at 40hz has a lower impedance at 40hz, and more power. More power = louder, right? Not necessarily. The green has a higher impedance from 30hz - ~50hz, so that means less power being received to the driver than blue, so blue must be better/louder right? Here's SPL for each, and as you can see green has more output in the same range than blue, yet the driver is seeing less power. The key point I'm making is people seem to underestimate the value of enclosure efficiency, and instead hype more power and or powering handling. The above program is WinISD pro, and it's free to download.

A GCON will outperform the Sa in a sealed enclosure.

Reread my first sentence, and look at the impedance vs frequency graph, and you'll understand.

JL Audio subs do pretty well in sealed enclosures loud-wise if you can get any used. Referencing the W6 and W7s.

When they say "they'll be over..." that's just to be expected because they have or have read what normally happens when measuring it. Again, if this is for daily driving, do not attempt or expect to wire below the minimum advertised ohm load. Doing so will require far more knowledge than just knowing what this topic is about.

Honestly yes, the new amp has a MUCH lower noise floor. Almost no noise from anything anymore. It sounds less like an amplifier, and more like it should, like nothing at all.

<--- has never met a redneck with a $1200 coffee grinder or a $600 juicer who eats miso soup. <--- also currently lives deep in redneck territory. What about a redneck with a $1200 grill and a $600 AK? Wait, shit. I can see a redneck with an expensive grill and an AK... But damn, you guys take the fun out of sarcasm. If I was serious I would have said "you are no redneck you fuckin cocksucker". It's the hop, much more fun to expound. <--- has never met a redneck with a $1200 coffee grinder or a $600 juicer who eats miso soup. <--- also currently lives deep in redneck territory. What about a redneck with a $1200 grill and a $600 AK? Wait, shit. I can see a redneck with an expensive grill and an AK... But damn, you guys take the fun out of sarcasm. If I was serious I would have said "you are no redneck you fuckin cocksucker". ...I....I made fun of his nascar plates. :-( Neither of you are rednecks, you fucking cocksuckers.

I know everyone my sister show's her DCON to is always impressed. She says she always has them listen to it first, then shows it to them. They can't believe it's the only sub in the truck. I recommend them A LOT because they really are a great value. Whether the mic has a hard time with the sound or not it sure seems like they're really giving some output. One thing I noticed is that they seem to really be doing well covering their full range of bass.

Those DCONs are a sweet low power sub! Nice video!

I got a new highs amp from a friend of mine! Epic ass Audiosystems X-Ion 70.6 Plus!!!! Two fans on this side and two side on the other. A little fuzzy, but you get the idea.