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Subwoofers 80hz and Down under!

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  #21  
Old 11-26-2018, 09:53 PM
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Originally Posted by SCAudiophile View Post
+1..

Call REL, they can walk you thru it...(to OP)
Since I don’t have the 402 it doesn’t matter any longer, but last year I did call REL....their response was that they had no idea so just use the line level inputs.
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  #22  
Old 11-27-2018, 11:31 AM
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Originally Posted by audioguy3107 View Post
Since I don’t have the 402 it doesn’t matter any longer, but last year I did call REL....their response was that they had no idea so just use the line level inputs.
I helped a friend of mine hook up a 212/SE to his MC 402 and the final answer from REL was to use the low level input.

In their dozens of detailed online support pages:

https://rel.net/how-to-connect-my-rel/

they do not have a way to connect a fully balanced and floating amplifier to their grounded high level input. So even though they clearly indicate the low level connection is inferior, that's the only choice that works with the likes of the McIntosh MC 402 and MC 602. Other McIntosh amplifiers may be different and may work - I just don't have personal experience with them.

Tom
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  #23  
Old 11-27-2018, 01:33 PM
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Originally Posted by W9TR View Post
I helped a friend of mine hook up a 212/SE to his MC 402 and the final answer from REL was to use the low level input.

In their dozens of detailed online support pages:

https://rel.net/how-to-connect-my-rel/

they do not have a way to connect a fully balanced and floating amplifier to their grounded high level input. So even though they clearly indicate the low level connection is inferior, that's the only choice that works with the likes of the McIntosh MC 402 and MC 602. Other McIntosh amplifiers may be different and may work - I just don't have personal experience with them.

Tom
Your comment is 1/2 correct, as I stated earlier connect the blk. wire to the gnd. side of a RCA input on the amp or run a separate wire from amp RCA to sub input RCA. This works perfectly and allows use of the Neutrik connection. I have done this on several REL subs without issue. It is a shame REL has not discovered this and provided it to their customers.
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Old 11-27-2018, 01:41 PM
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Tried that - didn’t work as the speaker outputs on the 402 and 602 float wrt chassis and signal ground.
To their credit REL does describe the method you suggest in their extensive online hookup info. Also in REL’s defense their subs will work with most amps out there. And the low level connection always works.
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Last edited by W9TR; 11-27-2018 at 01:48 PM.
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Old 11-27-2018, 01:49 PM
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Quote:
Originally Posted by W9TR View Post
Tried that - didn’t work as the speaker outputs on the 402 and 602 float wrt chassis and signal ground.
To their credit REL does describe the method you suggest in their extensive online hookup info. Also in REL’s defense their subs will work with most amps out there. And the low level connection, which always works.
Thanks for the great information Tom, I figured that some issue like that was always the case. The thing that threw me was that when I talked to REL, of course they mentioned that they've had tons of McIntosh/REL users with no issues. Whoever I talked to at their tech support probably didn't drill down into the fact of the specific characteristics of the MC 402.

- Buck
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  #26  
Old 11-27-2018, 02:53 PM
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Quote:
Originally Posted by W9TR View Post
I helped a friend of mine hook up a 212/SE to his MC 402 and the final answer from REL was to use the low level input.

In their dozens of detailed online support pages:

https://rel.net/how-to-connect-my-rel/

they do not have a way to connect a fully balanced and floating amplifier to their grounded high level input. So even though they clearly indicate the low level connection is inferior, that's the only choice that works with the likes of the McIntosh MC 402 and MC 602. Other McIntosh amplifiers may be different and may work - I just don't have personal experience with them.

Tom
Yes , it appears to be an unusual situation with these particular McIntosh amps. It seems that the autoformer is being used as an isolation transformer. Common in surgical suites and boats. Seems unusual for a stereo.

So, in this case there is really is nowhere to connect the black wire to get a reference ground voltage - there is no such path.
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Last edited by clpetersen; 11-27-2018 at 02:58 PM.
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  #27  
Old 11-27-2018, 03:57 PM
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Quote:
Originally Posted by clpetersen View Post
Yes , it appears to be an unusual situation with these particular McIntosh amps. It seems that the autoformer is being used as an isolation transformer. Common in surgical suites and boats. Seems unusual for a stereo.

So, in this case there is really is nowhere to connect the black wire to get a reference ground voltage - there is no such path.
Correct in this situation the blk. wire is left unattached. My system is the same. It requires a separate wire between the amp or preamp RCA gnd. to one of the sub RCA jacks. The red and yellow are connected to the amp's right and left speaker binding posts.
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  #28  
Old 12-05-2018, 02:57 PM
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IF anyone is still reading this, i just received this email from Chuck at McIntosh today - seems to confirm everything i just read above:

Hi David,
Yes, the MC402 is Quad Balanced and can not be run with the negatives tied together, do not use the REL speaker level connector.

Connect low level from your preamp to the REL RCA inputs.
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