Which subwoofer?

@rixthetrick: To read lots of discussions about the GR Research/Rythmik OB/Dipole Sub, head over to the GR Research Forum on AudioCircle. There are threads dedicated to the sub which contain info provided by GRR owner/designer Danny Richie, as well as guys who have built it. Once you have heard an OB woofer, sealed/ported are simply no longer good enough!

Rythmik's Brian Ding does not actively promote the OB Sub, though it is listed amongst the DIY/Custom models (not just the OB, but also sealed and ported subs.). On the Rythmik website, owner/designer Brian provides a LOT of info about the Rythmik line of subs, some of it very technical (Brian has a PHD, and is brilliant). On the website there is also a link to another Forum with a dedicated Rythmik section. Rythmik owners are passionate about their subs! 

SVS

@bdp24 - thanks.
I know oldhvymec loves his OB too.

@oldhvymec - have your well fed chickens started laying Emu eggs yet? They are large and dark green, thought I'd share that, might save you puzzling over it in the future if they do :-)

I'm a huge fan of my SVS PB2000. I've owned Velodyne and Monitor Audio subs. This SVS is in another league. House shaking low end, great control and presence. I enjoy the ability to use the phone app to really dial it in. For me it would be a no-brainer. 

I've owned Velodyne, SVS and RBH subs - and now have a JL F112 V2.  The JL is in a completely different league in my system.