REL subs with Rowland Amplifiers


I'm having issues connecting my REL Carbon limited subwoofer to my Jeff Rowland 625 S2 amplifier via the high-level input. I connected my sub according to REL's instructions...yellow lead to positive on one channel, red lead to positive on the other channel, and floating the black wire(ground). I get minimum output when connected according to the instructions. When I use the low level input, the output is sufficient and the sub sounds great. Per my conversation with Jeff Rowland I need to ground the black wire by loosening a screw on the amplifier and connecting the black wire, but if it isn't properly grounded I may damage my amplifier. Is there anyone that owns a REL with Jeff Rowland 625 S2 amplifier or other balanced differential amplifier? If so, how do you connect your REL via the high-level input. Is there an easier way to ground the wire than unscrewing the screw on my amplifier. I just don't want to unscrew the screw and prefer another method of grounding the sub.   
ricred1
daveyf,

"What made you pick the Carbon Limited?" I was originally looking at a single No. 25 or dual S5s. After a long conversation with the dealer about my main speakers, the fact that I had a single JL Audio F112 v2, and I listened to music the majority of the time he recommended the Carbon Limited. If it didn’t work in my system I had the opportunity to return it. I was purchasing right at the time that REL was discontinuing the S3 and S5, so I eliminated the S5. I talked to REL and a few other people that convinced me that dual Carbon Limited subs were a better fit than a single No. 25. I’m extremely satisfied with my choice.

I'm ordering the Signal Cables today:)
 @ricred1   Good move on the Signal cables. Signal make some excellent cables at very fair prices, imo.
Signal make some excellent cables at very fair prices, imo.

+1.  I've used a couple of their Digital Reference power cords with fine results.  And Frank, the proprietor, is a class act.

Best regards,
-- Al



@ricred1 

Thanks for your initial thoughts on the Carbon limited. Look forward to hearing more. Enjoy!
Ricred1 I have a 212se. I like the rel because of nuance. It gives you enough bass but it doesn’t distract from the music. You hear low level bass strings better. The bass melts into the music perfectly for me and it helps the lower midrange a little so it is a smooth transition. I’m thinking of getting an addition 212se