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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
ricred1 OP
2,022 posts
 
I think in theory REL is correct; however listening is the final judgement. If I or anyone else prefers the sound of the low-level input over the high-level, what REL claims is mute.
daveyf's avatar
daveyf
2,871 posts
 
@ricred1  Agree. However, be sure to listen to both set ups. If the low level is preferred in your room and system, so be it. Everyone has a different set of preferences, and their rooms and systems are also dissimilar...therefore your result/favorite may be leaning towards the low-level input. 
ricred1 OP
2,022 posts
 
I've gone back and forth between the high-level and low-level inputs. I prefer the low-level input...bass is more dynamic, tight, and articulate; the mids and highs have more detail and just sounds more alive.
daveyf's avatar
daveyf
2,871 posts
 
Interesting, I wonder what accounts for your findings? 
ricred1 OP
2,022 posts
 
daveyf,

I don't know the answer to your question. I can only tell you what I hear. I'm using Audioquest Boxer subwoofer cables for the low-level connection and the Signal speakon cables for high-level, so both cables are the same quality.
Now that I've decided to use the low-level inputs I'm curious to hear opinions on if there are any significant difference between subwoofer cables?
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