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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
1,981 posts
 
daveyf and almarg PM sent
almarg's avatar
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almarg
9,670 posts
 
PM answered.

Best regards,
-- Al

ricred1 OP
1,981 posts
 
Although I'm frustrated with the inability to at least try the high-level input, I ordered a second REL Carbon limited that I should have on Monday. The addition of a single REL has increased my enjoyment of my 2-channel system; so I figure dual subs will be better. I reached out to REL again today in hopes that someone can provide a simple way to use the high-level input without damaging my amplifier or sub. Hopefully someone from REL will contact me tomorrow. 
daveyf's avatar
daveyf
2,835 posts
 
In the past whenever I have contacted REL, i have done so via e.mail. They have always responded fairly quickly to all of my inquiries and questions.

The addition of another REL should give you a nice boost in SQ, albeit with a lot more set up time involved and experimentation in positioning, x-over, and volume settings in order to get the blend to be invisible. It took me almost two months to get it right...and I am still making very minor adjustments even now!! Two subs are more than twice as difficult to dial in than just one...BUT the effort will be worth it.
ricred1 OP
1,981 posts
 
Thanks, I will send them a email.
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