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Old 14th April 2012, 04:48 PM   #3661
avr300 is offline avr300  Denmark
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Quote:
Originally Posted by robbbby View Post
No. I was never blaming the ncores, knew it had nothing to do with them, was just posting to get some advice.
Then the advice must be - take a look at your source
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Old 14th April 2012, 05:43 PM   #3662
robbbby is offline robbbby  Canada
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[QUOTE=Julf;2985153][QUOTE=robbbby;2985113]Ah, ok. Just programmed a button to mute. Static still there when muted, but music still plays very faintly through the tweeter when muted.
Quote:

Hmm. Either the mute is badly designed, or designed that way on purpose.



OK, a possible issue is that the nc400 is fairly sensitive (or has a fair bit of gain, depending on how you want to look at it). Great in that works even with weak, unbalanced consumer grade signals, but a proper balanced XLR stage is much "hotter", so you are actually giving away a fair bit of signal-to-noise ratio by having the volume turned down that low. If your normal listening level is somewhere around 75 dB, your "full volume" would be 121 dB.... I assume you haven't ever tried playing at full volume?

Sounds you could easily lower the gain by 10 dB (lowering the HF hiss by the same amount) and instead turn up the volume by 10 dB., but that involves the R141 surgery that I right now can't recommend to anyone... :/
Hmm, I don't understand all this stuff 100% so i'll have to do some more reading, but I do remember reading some stuff on the large mytek thread over at CA that because mytek makes "pro" gear, even this consumer dac runs really loud, or has a really hot output. I remember reading that not all pres will work with it because of output voltage or something. Maybe that has something to do with it coupled to the sensitive ncore?
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Old 14th April 2012, 06:10 PM   #3663
avr300 is offline avr300  Denmark
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Easy now Julf. The dB representation is typically the attenuation going from 0dB (full throttle) to the lowest setting (-xxdB)

The 121dB, where did that come from ? (It would pretty damn loud)
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Old 14th April 2012, 06:46 PM   #3664
yetis is offline yetis  United States
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Quote:
Originally Posted by dan1502 View Post
You have the right cable connection block. Regarding the crimp terminals you want to pick one that is supplied as a bag (normally 100) rather than a reel. You then need to pick one to suit your cable thickness. Then just click on the various options that fit these criteria to check they fit the housing.

I have details of those needed to make your own power cable and if you are making shorter (or longer) cables between NC400 and SMPS600.
After all the work, I notice you likely have the answer to my next question. I am pretty certain that the female connector for the power cord is the VHR-3N on this http://www.jst-mfg.com/product/pdf/eng/eVH.pdf. However, I notice they also offer a VHR-3M, which they say incorporates measures to avoid shock in high voltages. I am all about avoiding shock, just want to make sure that Hypex didn't us the 3m variant. I also think I am correct in thinking these are the correct crimps? Digi-Key Part Search?

One other question. Do you have to use crimp tool? Are they different tools for both?

Thank you

Last edited by yetis; 14th April 2012 at 06:58 PM.
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Old 14th April 2012, 06:48 PM   #3665
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[QUOTE=robbbby;2985222][QUOTE=Julf;2985153]
Quote:
Originally Posted by robbbby View Post
Hmm, I don't understand all this stuff 100% so i'll have to do some more reading, but I do remember reading some stuff on the large mytek thread over at CA that because mytek makes "pro" gear, even this consumer dac runs really loud, or has a really hot output. I remember reading that not all pres will work with it because of output voltage or something. Maybe that has something to do with it coupled to the sensitive ncore?
I do all my listening and set up at pro levels, since that is the environment where I work. I have had no problem with the Ncore with those levels.

"Pro" level is usually -16 or -18 dbfs for +4dbu out, or -16 below full scale digital out making it 1.23Vac. Full scale out would be approx 7.75Vac.

Consumer level is the same -16 dbfs gives -10dbu, or 14 db less for the same digital level. (0.245Vac) , making full scale approx 1.5 Vac

(nice calculator at <http://www.pronine.ca/vdbudbm.htm>)

Alan
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Old 14th April 2012, 08:10 PM   #3666
Julf is offline Julf  Europe
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Quote:
Originally Posted by avr300 View Post
Easy now Julf. The dB representation is typically the attenuation going from 0dB (full throttle) to the lowest setting (-xxdB)

The 121dB, where did that come from ? (It would pretty damn loud)
If his normal listening level is at the setting -46, and my guess was that that would represent something like 75 dB of real sound pressure, then full volume, 0 db, would be at 75 + 46 = 121 dB.
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Old 14th April 2012, 08:16 PM   #3667
Julf is offline Julf  Europe
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[QUOTE=waltzingbear;2985305][QUOTE=robbbby;2985222]
Quote:
Originally Posted by Julf View Post

I do all my listening and set up at pro levels, since that is the environment where I work. I have had no problem with the Ncore with those levels.

"Pro" level is usually -16 or -18 dbfs for +4dbu out, or -16 below full scale digital out making it 1.23Vac. Full scale out would be approx 7.75Vac.

Consumer level is the same -16 dbfs gives -10dbu, or 14 db less for the same digital level. (0.245Vac) , making full scale approx 1.5 Vac
Precisely. So while the default gain of the ncore, 26 dB, is great for consumer level, you really want 10 - 14 dB less gain if dealing with pro levels.
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Old 14th April 2012, 08:22 PM   #3668
dan1502 is offline dan1502  United Kingdom
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Originally Posted by yetis View Post
After all the work, I notice you likely have the answer to my next question. I am pretty certain that the female connector for the power cord is the VHR-3N on this http://www.jst-mfg.com/product/pdf/eng/eVH.pdf. However, I notice they also offer a VHR-3M, which they say incorporates measures to avoid shock in high voltages. I am all about avoiding shock, just want to make sure that Hypex didn't us the 3m variant. I also think I am correct in thinking these are the correct crimps? Digi-Key Part Search?

One other question. Do you have to use crimp tool? Are they different tools for both?

Thank you

The part numbers is JST VHR-3N with crimp pins SVH-41T-P1.1

However the crimp pins above are only available in reels (of a thousand or so). The SVH-21T-P1.1 are available in smaller numbers but are for smaller cables.


I've managed to get hold of a few but through buying from a retailer.

I was pondering which crimp tool to buy but have decided to just crimp with pliers then solder as although I don't understand crimping properly there seem to be dedicated tools which cost a lot and different tools and/or dies for different crimp terminals.

Let me guess you next question - spades/fork terminals?

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Old 14th April 2012, 08:23 PM   #3669
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Okay, I've got a problem and have had no luck tracking it down.

I just assembled a quad-mono NC400 amp yesterday. Three of the channels are working perfectly, but one is intermittent. I've tried swapping the power supplies and all the cabling, and it's definitely the NC400 module.

I've adjusted the DC output with nothing connected so that when it's working it reads 0v. However I've noticed that when the signal cuts out it jumps to -300mv or so. Again I've swapped all the cabling and the power supply with no luck. Moving the module around doesn't seem to effect it, and I got out the canned air and cleaned the hell out of the thing just in case something was shorting.

At this point I have to imagine it's a defective module but I wanted to see if anyone else had run up against a similar issue. I reached out to hypex last night but it's the weekend so I'm not expecting a reply until monday. And of course I'd rather not mail the thing back to the netherlands if I can fix it myself.

Any thoughts? Thanks everybody.
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Old 15th April 2012, 03:12 AM   #3670
yetis is offline yetis  United States
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Quote:
Originally Posted by dan1502 View Post

The part numbers is JST VHR-3N with crimp pins SVH-41T-P1.1

However the crimp pins above are only available in reels (of a thousand or so). The SVH-21T-P1.1 are available in smaller numbers but are for smaller cables.


I've managed to get hold of a few but through buying from a retailer.

I was pondering which crimp tool to buy but have decided to just crimp with pliers then solder as although I don't understand crimping properly there seem to be dedicated tools which cost a lot and different tools and/or dies for different crimp terminals.

Let me guess you next question - spades/fork terminals?

http://www.revolutionpower.com/p/Fur...inal+Pack/374/


Well, I on the spades, was thinking these.. Might need a little trimming, but should work?


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