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Old 22nd June 2012, 12:22 AM   #4531
ChrisPa is offline ChrisPa  United Kingdom
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Abraxas

Twist the psu cables
Twist the speaker cables and take them from the same side of each terminal

This is mentioned on the data sheet (and earlier in the mega thread)

Can't see what you've done with your input leads - what are the terminals of the RCA connected to?

The orientation of the right hand amp is better than the left as the input cable avoids the psu wiring
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Old 22nd June 2012, 07:24 AM   #4532
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Can't see what you've done with your input leads - what are the terminals of the RCA connected to?
In terms of noise this is going to be the crucial bit.
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Old 22nd June 2012, 07:40 AM   #4533
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Bruno or JP, what is the nominal DCV of the driver voltage supply on the SMPS600?
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Old 22nd June 2012, 08:15 AM   #4534
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20V - ish (not regulated, hence dependent on load and line conditions). The NC400 internally regulates this to 15V.
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Old 22nd June 2012, 08:21 AM   #4535
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Alan, Chris, Bruno:

Re inputs - input pins 2,3,4 go to the ground of the RCA connector, basically like in figure 4 of the data sheet without case. Input cables are not fixed in any way - if connected they are placed away from the psu wiring.
I used RCA to be able to connect sources directly and skip preamplification. Since there is no additional "ground" it should be ok?

Re twisting - I know they are supposed to be twisted, but this is the impatient setup . I agree however that before mentioning noise that should have been done. Will correct and report back.

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Last edited by Abraxas336; 22nd June 2012 at 08:33 AM.
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Old 22nd June 2012, 05:50 PM   #4536
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Originally Posted by Abraxas336 View Post
I used RCA to be able to connect sources directly and skip preamplification. Since there is no additional "ground" it should be ok?
going directly from source is quite lovely, however its still preferable to use a balanced input connection extended to the output of the source, even if the source is unbalanced (such as your setup).

This retains the inherent noise rejection properties of the balanced input in the amp. So that means an XLR on the amp end and phono on the source. See Bruno's notes on building it.

The twisting isn't as important as moving the output wire away from the inductor.

Still hope to get the answer to the question: is there any noise with the input connectors disconnected?

Alan

Last edited by waltzingbear; 22nd June 2012 at 05:55 PM.
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Old 22nd June 2012, 05:57 PM   #4537
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Originally Posted by Bruno Putzeys View Post
20V - ish (not regulated, hence dependent on load and line conditions). The NC400 internally regulates this to 15V.
Curious, what is the dropout voltage for this regulator?

Alan
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Old 23rd June 2012, 01:17 AM   #4538
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I apologize in adance for the novice questions. I have searched this thread for my answers and I think I understand the input cable connections. I am about to solder my Mogami cable to the XLR connectors, but before I screw up, could someone please help me make sure I am doing this right. I plan on using the "Preferred" connections for fully balanced use. Thanks.

1. I have no ground connected to my IEC, correct?

2. Is the "Nampon" wire the small black wire attached to the Mogami cable?

3. Does this wire connect to the chassis?

4. Is the shield wire of the Mogami cable also connected to the chassis?

5. It appears that the XLR connector shown as "1Q" is also connected to the chassis.

If I am correct, the XLR "1Q", Nampon wire and the Mogami shield are all connected to the chassis with no ground connection to the IEC?
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Old 23rd June 2012, 07:26 AM   #4539
Julf is offline Julf  Europe
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Originally Posted by slowlearner View Post
1. I have no ground connected to my IEC, correct?

2. Is the "Nampon" wire the small black wire attached to the Mogami cable?

3. Does this wire connect to the chassis?

4. Is the shield wire of the Mogami cable also connected to the chassis?

5. It appears that the XLR connector shown as "1Q" is also connected to the chassis.

If I am correct, the XLR "1Q", Nampon wire and the Mogami shield are all connected to the chassis with no ground connection to the IEC?
Yes to all of those, but you might want to keep the chassis connections short and close to each other.
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Old 23rd June 2012, 08:32 AM   #4540
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Will do Julf.

Thanks for the reply.
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