Rythmik Audio F12/F12-400 vs JL Audio E-Sub e112

Yeah @harpo75, the "regular" Rythmik (and GR Research) subs---like most (all?) others---will play up to little more than 100Hz. The woofers in the OB/dipole Sub are designed to work in "free air", and the Rythnik Audio plate amp included with the kit is modified specifically for dipole use, with a dipole cancellation compensation circuit.

Since the woofer in the ET LFT-8 plays up to 170Hz, a "normal" sub (whether Rythmik, GR Research, or any other brand) cannot take the place of the LFT's dynamic driver, which is a woofer not a subwoofer. However, the Rythmik F8 (a pair of 8" drivers in a sealed enclosure)---which will play up to 250Hz---CAN be used in place of the stock LFT-8's woofer. But the F8 is priced higher than the OB kit, and appears to be nearing discontinuation anyway.

I have a pair of JL E112 that I use in my 2 channel / home theater setup. I went with Jl because they have excellent aurthority for theater effects while maintaining the ability to be musical for 2 channel. If I was only going to use them for 2 channel, then I would have gone with a more musical subwoofer such as REL or Perlisten.

I did have a "fuzzy noise"issue with one of my JL E112 which I had to send back to the factory two times for diagnosis and repair. They actually couldn't find the problem and eventually sent me a brand new replacement. That wouldn't be possibly out of the country. Although I'm very ahppy with my setup now, I'd pass on the JLs for your situation.

@damusicguy okay, looks like JL is not a best option. I would like to have Perlisten but they are too expensive for me now. Maybe if I could find 10" used, but no one sells them.

Rythmik has a good reputation and is probably the best bang for the buck. Based on the measurement I would argue they are better than a lot of the completion regardless of price.