• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required as is 20 years of participation in forums (not all true). There are daily reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

Review and Measurements of Nord One NC500 Amp

willham

New Member
Joined
Oct 23, 2020
Messages
1
Likes
0
This guy just get used to listen music in mist , with bad recordings etc...
Now when everything is cleared he blames the amp instead of trying to get a better recording.
It's a real shame.

Setting aside the reviewer himself, the region he complains about, or the 'glare' seems to coincide with the sharp rise in distortion in the treble past 2k.
Nord One NC500 Amplifier THD vs Level vs Frequency Audio Measurements.png


Compared to the the Hypex NC400, which was mostly flat.

Hypex nc400 amplifier distortion vs frequency measurements.png


Is this a coincidence? Is 0.3% thd+n audible?
 

BrokenEnglishGuy

Major Contributor
Joined
Jul 19, 2020
Messages
1,429
Likes
814
OK, here it is:

View attachment 27098

Ignore the initial glitch which was me turning off the generator by accident. I say from thermal point of view, the Nord One passes with flying colors. The top of the enclosure did not change temps at all. Bottom of the unit below the amps was slightly warmer than room temp. It can output this level of power forever.
the 100w is continous at 2 ohm too, right?
 

Pritaudio

Active Member
Joined
Nov 7, 2020
Messages
139
Likes
54
the hypex nc502 is supposed to have sinad 96db according to the data sheet.
it is off the shelf with no buffer board.
but we need third party measurements.
this nc500 module only got 96db from nord When it’s data sheet suggests higher.
cant accurately trust hypex.
 

Sam1879

Member
Joined
Oct 15, 2020
Messages
9
Likes
7
Location
Switzerland
Hi there
Just wanna share my experiences with this amp, made short.
Had this amp for maybe a year now, and i can recommend it almost in every aspect.
Subjective review:
Sounds great on: power demanding Infinity Kappa 6.2i, Kappa 8.1i and Kappa 8
Sounds not so good on: less power demanding Dali Opticon 6 (with ribbon type super high freq. driver, crossed over at 14k)

No problems or downsides of any form.

I love the hypex amps. Small, cool and powerfull. These measurements are great too if not as good as the NC400's.

Off topic-ish; I bought the NC400 monoblock kit halfway through last year. I remember hooking them up and being very impressed. They did everything right from top to bottom, I heard none of the "class D" cliches I had psyched myself up about. But, something with drums was just not right. Snares and hi-hats especially. I told myself it was just the ultimate clarity and transparency of the amplifier. I used them until last week to get used to the sound.

Switching back to the class AB amp was a real "Ahhhh" moment. There were the snares, hats. Bass guitars even had a bit more flesh and crunch. If living with the hypex was like sleeping in a 5 star hotel It was like coming back home to my own bed. It seems theres no place like ...class AB amps. For me anyway. Call it me enjoying distortion or whatever but the AB amp just sounds more right, if not as transparent and powerful.

I can join McFly on this quote, but on the Dali Speakers only. Not on the Kappas. Everything fine on the Kappas.
Maybe to be more exact there was audible hiss in some higher frequency areas, i would say in the top female voice area.
And for the Dalis it was an absolutely oversized amp, of course.

But still, is there a measureable explanation for this?

Could it be the super high freq. driver reveal any switching noise in audible spectrum?
Is amp-speaker synergy 100% proven and "scientifically" accepted?
Maybe i just had a bad day and was hearing a ghost ;) ? Did AB-Switching but not ABX blind.
 
Last edited:

audioBliss

Active Member
Joined
May 7, 2019
Messages
258
Likes
287
Location
Sweden
Hi there
Just wanna share my experiences with this amp, made short.
Had this amp for maybe a year now, and i can recommend it almost in every aspect.
Subjective review:
Sounds great on: power demanding Infinity Kappa 6.2i, Kappa 8.1i and Kappa 8
Sounds not so good on: less power demanding Dali Opticon 6 (with ribbon type super high freq. driver, crossed over at 14k)

No problems or downsides of any form.



I can join McFly on this quote, but on the Dali Speakers only. Not on the Kappas. Everything fine on the Kappas.
Maybe to be more exact there was audible hiss in some higher frequency areas, i would say in the top female voice area.
And for the Dalis it was an absolutely oversized amp, of course.

But still, is there a measureable explanation for this?

Could it be the super high freq. driver reveal any switching noise in audible spectrum?
Is amp-speaker synergy 100% proven and "scientifically" accepted?
Maybe i just had a bad day and was hearing a ghost ;) ? Did AB-Switching but not ABX blind.

I had the annoying high frequency hiss on my Apollon amp using the NC502 modules until I switched to a balanced preamp. Then it was all silent from there. I tried 2 different RCA-XLR (one of them being the Nord silver one) but both had the hiss. At least on the NC-modules you basically need a real balanced connection. The NC400 monoblocks don't have this hiss even using unbalanced preamp. Not sure what pre-amp you are using but that's my experience with hiss using Hypex stuff.

In my opinion you can't really oversize an amp. I use NC502 even for speakers that can max handle 80W and it's awesome. For my speakers that can take thousands of watts it's also awesome :D
 

Sam1879

Member
Joined
Oct 15, 2020
Messages
9
Likes
7
Location
Switzerland
thanks for sharing your experiences. as far as i remember i had (and still have) it balanced directly on the smsl su8v2 dac, but is quite a while ago. maybe it was really connected with a rca-xlr cable on an unbalanced dac output. i‘m not 100% sure anymore.
 

Sam1879

Member
Joined
Oct 15, 2020
Messages
9
Likes
7
Location
Switzerland
but thinking back... i think it was really an unbalanced output when the hiss happend.
 

watts

Member
Joined
Oct 17, 2021
Messages
5
Likes
3
When not in use it is better to turn them off. Another thing is to turn them on for a while before listening to music, class A and class AB amps.

About two years ago I had a power surge because of some old power company cables, 400 Vac (Spain: 230 Vac / 50 Hz). The stereo was saved thanks to a varistor that I decided should have the DC blocker x4 ME (from the first DCB protototype). It also burned one of the two fuses.

DC-Blocker-prototype-varistor-burned.jpg


[IMG, link] http://maty.galeon.com/WP-imagenes/hum/ATL-Hi-Fi-DC-Blocker-x4-ME-open-front-side-3.jpg

Other option is a DIY SMPS with much better components. Pinnocchio using them for the new amplifier you are mounting. Made by Cresnet.

https://www.diyaudio.com/forums/solid-state/312866-global-loop-amplification-post5973161.html

[IMG, link] http://maty.galeon.com/WP-imagenes/hum/Simpelstark-with-Cresnet-smps-by-pinnocchio.jpg
After leaving these on for 4 years, and having the caps in the SMPS1200 go south, I think I will try to turn them off more often :) Maybe that will increase longevity, but maybe higher quality caps will as well.

Would be interested to hear some of your thoughts of the upgraded Nichicon caps in the power supply. I am aware I could have replaced the board for less.

(Still love the sound from these amps by the way)

IMG_0006.JPG
 

Attachments

  • IMG_0006.JPG
    IMG_0006.JPG
    324.2 KB · Views: 40

maty

Major Contributor
Joined
Dec 12, 2017
Messages
4,163
Likes
2,827
Location
Tarragona (Spain)
In a switched source I do not know what improvement they can bring except for a longer duration and reliability.

The problem is paying so much for one that uses mediocre capacitors. To understand us, can you imagine a sports car with sky seats instead of leather?
 

TheBatsEar

Major Contributor
Forum Donor
Joined
Jun 16, 2020
Messages
1,988
Likes
3,083
Location
Germany
It is odd that a limited production hand assembled amp would leave the manufacturer with its channels out of phase.
A larger manufacturer would add a test to make sure it never happens again. This one could be electronic and fully automatic in nature. Write once, benefit forever and for any type of amp you build.

I guess it's harder to do it like that for a smaller manufacturer, he probably works with some kind of manual checklist to ensure quality. Which will fail every now and then, because: people do people errors.

On the other hand, perhaps the builders are objectivists, who have been scientifically proven to be unable to hear this difference. ;)
More reason to let a computer do it.:cool:
 

pras1011

Member
Joined
Mar 20, 2021
Messages
56
Likes
16
So just to confirm that this can do 270 watts 8ohms and 445 watts in 4 ohms? Is that over a 20hz to 20khz frequency range?

The specs on the Hypex website is 400 watts 8 ohms and 700 watts 4ohms and therefore are incorrect?
 
Top Bottom