A lot of what you pay for in a JL Audio sub isn't raw performance but other things like build quality, features, post-purchase support. JL Audio's home audio subs are more like luxury products than their car audio systems. They have to be since USA manufacturing necessitates a greater return on each unit, much greater than an under-$1k product could possibly give. But the absolute margins for a JL Audio sub is way more than a Hsu, and it needs to be given the way these subs are manufactured. The Gotham is an extremely nice sub, but be aware you are paying a lot more for luxury amenities than you are actual performance. To put it another way, $16k, the MSRP of a Gotham, will get you one very nice sub from JL Audio, but $16k worth of Hsu subs would get you pretty unimaginable performance that would be many times more powerful and high performing than that of a Gotham. It's tempting to use a car analogy here, where a Hsu is a corvette and the JL Audio is a Bugatti, but that doesn't quite hold since subwoofer performance increase at a logarithmic rate the more you add, whereas the performance of a car doesn't improve just from buying more of them.