Jeff Rowland with Rel sub

It doesn't work to connect the REL to the speaker terminals? What happens?

As Drubin says, the REL is designed to be connected to the speaker outputs of your amp.....i've owned a few Rowland pieces and have a Storm III and can't remember anything different about the speaker connectors...

if you were planning on using some Pre-Outs, don't, the REL sounds better at the speaker outputs.

What I was told, but do not understand, is that the Rels were not designed to connect to a differentially balanced switching amp which I guess is a digital switching amp.?. It hooked up fine to my Concentra, but not the Concerto. It cannot be connected to the Balanced Hi Output on the back of the sub or it will not play or if it does will crack, pop and also the gain control will not work along with an audible hum. It was recommended to try the Low Level so I wanted to know if anyone had luck with this before I invest in a subwoofer speaker wire with the RCA jacks. Or if someone had come up with a solution that works for them.

I had problems with REL and a Pass Labs X-150 and never could get a satisfactory answer. It worked, but not as it should have. Perhaps you are encountering the same kind of issue, but it's still not clear (1) how you are trying to connect the REL and (2) what the result is. Have you tried connecting the REL to the speaker terminals on the Concerto? What do you hear?