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Old 5th February 2006, 06:47 PM   #1
Regnad is offline Regnad  United States
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Question UCD amp and REL sub...

I could not connect to the high-level input of a REL sub when using a PS Audio ICE-based amp due to the lack of a common ground.

Now that I am using a stereo UCD400 amp, can I connect the two amp "grounds" together and then connect that to the REL black common ground wire?

Thanks a lot for any help...
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Old 5th February 2006, 07:04 PM   #2
cowanrg is offline cowanrg  United States
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Default Re: UCD amp and REL sub...

Quote:
Originally posted by Regnad
I could not connect to the high-level input of a REL sub when using a PS Audio ICE-based amp due to the lack of a common ground.

Now that I am using a stereo UCD400 amp, can I connect the two amp "grounds" together and then connect that to the REL black common ground wire?

Thanks a lot for any help...
you should be able to. why cant you use use the black speaker terminal for this? thats typically how rel's are connected...
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Old 6th February 2006, 03:19 AM   #3
Regnad is offline Regnad  United States
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I understand that the HCA-2, ICE and Tripath type amps have DC levels at their output and you cannot tie the "negative" speaker output to ground. This means that you cannot use the standard hi-level cable that REL provides.
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Old 6th February 2006, 07:57 AM   #4
dorkus is offline dorkus  United States
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Quote:
Originally posted by Regnad
I understand that the HCA-2, ICE and Tripath type amps have DC levels at their output and you cannot tie the "negative" speaker output to ground. This means that you cannot use the standard hi-level cable that REL provides.
hm, that would explain why when i hooked up a speaker-to-line-level adapter to an HCA-2 once, it went up in smoke...
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Old 8th February 2006, 01:00 AM   #5
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Quote:
Originally posted by dorkus


hm, that would explain why when i hooked up a speaker-to-line-level adapter to an HCA-2 once, it went up in smoke...
Tweakers never cease to amaze me. Electricity having virtually no delay - relative to human reflex - I always verify compatibility with a DVM in volts and ohms before I make a connection loop.

I work on a bench everyday and every time I make a shortcut such as not securing the scope probe tip and GND while trying to turn say a knob, damage often occurs that costs sometimes hours to fix. Word to the wise...
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Old 8th February 2006, 01:18 AM   #6
dorkus is offline dorkus  United States
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Quote:
Originally posted by koolkid731
Tweakers never cease to amaze me.
true, but i'd hardly call a standard subwoofer hookup a "tweak." having the negative speaker terminal held at high voltage is not common. i'm not sure if it was stated in the manual or not, but if it was clearly i missed it.

i highly doubt most average consumers even have a DMM.
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Old 8th February 2006, 02:46 AM   #7
Regnad is offline Regnad  United States
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Just received this email from Sumiko who distribute REL...

"With the sudden exponential increase of and varying topology or class D amps,we have until further notice stopped recommending anything but low level (RCA) connection. We are in the process of figuring out a universal (or at least semi universal) remedy to the issue. I will keep you email on file and contact you with this once we have it. We apologize for the inconvienience this may have caused you."

So, should I give it a go? I have already checked that there is no potential between the speaker negs and system ground.
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