Which sub of these brands has the least noise, since my setup is positioned in a nearfield environment. These brands are not listed in the registries of my usual studio gear providers, so I really have no idea about their models and spec.
Many of these subs have been measured by databass, where you can find incredibly detailed measurements of every metric available, including the CEA2010 standard. As an example,
here are those measurements for the Rythmik FV15HP. It's a 15" 600W ported subwoofer that is the same price as the 8" 130W Genelec subwoofer. It lacks balanced ins/outs though. If balanced connections are required, Erin at
Erin's Audio Corner did a review of the 10", 12", and 15" Monoprice subs, which have balanced connections, and (imo) show price/performance that's equal to Rythmik. I actually couldn't find the review on his website, but below is the youtube video where he gos over all the CEA2010(and more) data
Erin's a very knowledgeable member here. His handle here is
@hardisj , and he may be able to answer more specific questions about those subs. He also has a 12" Rythmik review on his site.
I'm not sure which of the other brands offer balanced ins and outs, as that's not something I really look for. Only brands I know for sure that have them are JTR and Monoprice, though JTRs cheapest sub is much more expensive.