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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
calvinj
2,319 posts
 
@ ricred1 that’s why I asked if your amp was class d. I knew that had been an issue.  As you know I’m a huge fan of rel subs. I think they are the best. I hope you can get the connection you need. 
daveyf's avatar
daveyf
2,871 posts
 
@ricred1   By summing the red and yellow wires together and using the black wire to negative you are only getting the signal from one channel of your amp. This is the way that I connect my dual subs...one per channel! But if you connect just one sub in this manner, you are only getting the information from the channel that you have connected to. IOW, a mono signal to the sub in question. This doesn't actually solve your problem if you want to use just one sub and have it run off both sides (l,r) of the stereo amp. ( or left/right mono blocks).
ricred1 OP
2,019 posts
 
calvinj,
I'm excited that everything is working like it is suppose to.
ricred1 OP
2,019 posts
 
daveyf,

The black wire is floated and not connected to anything. I'll have dual subs and will receive the 2nd sub on Tuesday. That's why I was advised to connect my single sub this way.
daveyf's avatar
daveyf
2,871 posts
 
@ricred1 If you are not connecting the black wire, I would be concerned that you are not grounding the sub. I connect my subs with the red and yellow summed to the red output per amp and the black to the black output per amp. This is with dual subs and mono blocks. I’m pretty sure that way they are each getting a mono signal....left to the left sub and right to the right sub. The way you are describing your connection would indicate that you are only getting the mono signal from one of your amps to the sub...and not the summed stereo signal.
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