Sub w/a CJ ET3 SE

I am not sure about best way but I was using splitter at the o/p of ET3SE going to my SB13 ultra. There was no detectable loss in audio quality from speakers.

It all depends on what subwoofer you are using. There are many different ways to hook up a sub to a system. More info would help!

My current sub is a 14 year old Velodyne. Pretty much a johnny one note. Looking around I noticed Klipsch has wireless sub and REL can connect directly to an amplifier. Has anyone tried these connections. I just bought a pair of Aerial 5T's very sweet sound and the bass is pretty good but I want a little more punch at the bottom. A smaller sub would be preferable and in the $800 range.

Take a look at this SVS SB-1000. The owners manual will show you all the options for hooking up a sub. BTW,I think that the SB-1000 would be a good match with the 5T’s!
https://www.svsound.com/products/sb-1000

I have the same preamp on my second system and I use a splitter for the sub and it works great.