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Old 27th June 2012, 05:03 AM   #4601
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Quote:
Originally Posted by waltzingbear View Post
its called negative feedback

Alan Garren
As I've been saying, yes, and digitally implemented. Cheers.
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Old 27th June 2012, 07:32 AM   #4602
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I revisited my first Ncore build yesterday, that means I opened up the case to take a peek inside... Lo and behold!!! - the PSU cable was not twisted properly, and the speaker wires were not twisted at all! And they came out from the wrong side of the lugs!! Fixed it. Slept really good the following night.
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Old 27th June 2012, 07:42 AM   #4603
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Quote:
Originally Posted by slowlearner View Post
Can the Mogami shield, Nampon wire and the XLR 1Q all be connected to the same chassis screw or should they be connected to different points near each other?
Yes, although "different points near each other" is a smidgen better in principle, if one wanted to split hairs.

Where you tie Nampon is not critical. That can go anywhere because all it wants to know is "yes" or "no".
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Old 27th June 2012, 11:36 AM   #4604
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Quote:
Originally Posted by waltzingbear View Post
Report?? Still have noises?

Alan
Alan et al.,

I can confirm that after twisting everything and keeping away from the coils the background noise level went down. I also realised after playing some more with everything my computer (which is connected to my preamplifier via Soundcard) introduced aditional noise/sounds even though the computer has not been used as source . Never heard that before.

Regarding my other statements about the sound - I find that I can now focus better on the actual sound which probably improves my attitude . Not really a reason to retract my statements yet, tough. But I will spend some more time.

Regards
Sven
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Old 27th June 2012, 12:18 PM   #4605
jtwrace is offline jtwrace  United States
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Quote:
Originally Posted by Bruno Putzeys View Post
Yes, although "different points near each other" is a smidgen better in principle, if one wanted to split hairs.
Is it actually audible?
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Old 27th June 2012, 09:45 PM   #4606
Mintzar is offline Mintzar  United States
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Having an issue with a pair of Ncore modules I am building for a friend.

There's no bass. It's almost as if there's a 6dB high pass filter above 100hz. The gain on the amp is also fairly low. With high sensitivity speakers I have to turn the volume fairly high to get it to a normal listening levels.

A few notes:
1. I designed linear power supplies for the modules.
2. The issue happens with both SMPS and Linear PS. The distortion on the top end is worse with the SMPS, but the bass reproduction faces the same issue.
3. The unit is wired for balanced operation, but I am using an RCA to XLR cable wired per the datasheet.
4. The speakers I'm using have a very high QTS of .95 and are full-range crossoverless (I think I read some comments somewhere about this).
5. The amplifier plays 'music' and LEDs light up as they should.
6. The issue is the same in both channels.
7. No crackles, pops, clicks, hums, or noise

The power supply is talked about here: Class D - Page 6

I know there was a few mentions of defective modules, but wanted to see if you guys had any thoughts in the mean time. Thanks for your advice!
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Old 28th June 2012, 08:34 AM   #4607
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Quote:
Originally Posted by Abraxas336 View Post
Alan et al.,

I can confirm that after twisting everything and keeping away from the coils the background noise level went down. I also realised after playing some more with everything my computer (which is connected to my preamplifier via Soundcard) introduced aditional noise/sounds even though the computer has not been used as source . Never heard that before.

Regarding my other statements about the sound - I find that I can now focus better on the actual sound which probably improves my attitude . Not really a reason to retract my statements yet, tough. But I will spend some more time.

Regards
Sven
Having a computer connected via a soundcard to your system is always going to create issues. You would be much better off outputting sound through an external dac, preferably via something like the Audiophilleo reclocker to further isolate computer bourne hash from entering your sound system. Without knowing what specific soundcard you are using (as there are exceptions), I would suggest that getting HQ sound from a computer soundcard is difficult to achieve.
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Old 28th June 2012, 08:57 AM   #4608
Omholt is offline Omholt  Norway
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I'm hearing a slight hum from mine. Is this normal?
Click the image to open in full size.
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Old 28th June 2012, 01:21 PM   #4609
jtwrace is offline jtwrace  United States
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Quote:
Originally Posted by Mintzar View Post
Having an issue with a pair of Ncore modules I am building for a friend.

There's no bass. It's almost as if there's a 6dB high pass filter above 100hz. The gain on the amp is also fairly low. With high sensitivity speakers I have to turn the volume fairly high to get it to a normal listening levels.

A few notes:
1. I designed linear power supplies for the modules.
2. The issue happens with both SMPS and Linear PS. The distortion on the top end is worse with the SMPS, but the bass reproduction faces the same issue.
3. The unit is wired for balanced operation, but I am using an RCA to XLR cable wired per the datasheet.
4. The speakers I'm using have a very high QTS of .95 and are full-range crossoverless (I think I read some comments somewhere about this).
5. The amplifier plays 'music' and LEDs light up as they should.
6. The issue is the same in both channels.
7. No crackles, pops, clicks, hums, or noise

The power supply is talked about here: Class D - Page 6

I know there was a few mentions of defective modules, but wanted to see if you guys had any thoughts in the mean time. Thanks for your advice!
Well, being that this is you Core Audio Technology Hypex Ncore Linear Power Supply | Solid state | Sherman Oaks, California 91403 | AudiogoN - The High-end Audio Community one would think that you have done fully objective long term tests. Can you provide us with all the power supply measurements?
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Old 28th June 2012, 01:36 PM   #4610
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It sounds like he's got one channel out of phase.
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