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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
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?
daveyf's avatar
daveyf
2,871 posts
 
Richard, you are comparing the two hook up connections with the subs in exactly the same place in the room...yes?
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