• 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). Come here to have fun, be ready to be teased and not take online life too seriously. We now measure and review equipment for free! Click here for details.

Review and Measurements of Hypex NC400 DIY Amp

Joined
Dec 28, 2018
Messages
71
Likes
44
Location
San Diego
sorry sent too soon.... anyway the Neurochrome amps work very well, are not sensitive to power supply type, use off the shelf parts, great support from Tom if needed, and are economical especially if you build them your self. I do wish I had the cool mounting bracket on the assembled kit though....
 

Ron Texas

Addicted to Fun and Learning
Joined
Jun 10, 2018
Messages
822
Likes
395
Location
Equidistant From Everywhere
On the topic of Hypex's power supply's reliability, am I correct assuming on power supply per amp (as in dual mono configs) would be less stressed?

I went to Hypex's site yesterday (yeah, I am supposed to save money reading this site, somehow the opposite happens ;) ) and wanted to order a kit and noticed their web store only has the mono kit these days it seems.

Thanks for the Marantz internal pics Maty! I also own a HD-AMP1 and, while it is an sweet sounding amplifier, there are some things I don't like about it: it does go in "protection" mode very quickly, with the power barely half way. That paranoid protection could be a sign of a stressed design. I opened the case, but decided against disassembling the device further when I saw how one did not have even visual access to anything without many additional steps.
You can buy an assembled and tested stereo Hypex amp from Nord in the UK for about what Hypex charges for 2 Mono kits.

https://www.nordacoustics.co.uk/nord-one-up-nc500-power-amplifiers NC500, 1254 GPB including shipping to the US. Note, you will probably need a preamp to drive this.
 

maty

Senior Member
Joined
Dec 12, 2017
Messages
304
Likes
105
Location
Tarragona (Spain)
Thanks for the Marantz internal pics Maty! I also own a HD-AMP1 and, while it is an sweet sounding amplifier, there are some things I don't like about it: it does go in "protection" mode very quickly, with the power barely half way. That paranoid protection could be a sign of a stressed design. I opened the case, but decided against disassembling the device further when I saw how one did not have even visual access to anything without many additional steps.
MARANTZ HD-AMP1

[Polish] https://audio.com.pl/testy/stereo/wzmacniacze-stereo/2607-marantz-hd-amp1

to English: https://translate.google.com/translate?sl=pl&tl=en&u=https://audio.com.pl/testy/stereo/wzmacniacze-stereo/2607-marantz-hd-amp1

One of the greatest strengths of this design, however, is the proprietary development in the field of impulse power amps (to which I devoted the frame next to it), decisive for good parameters, confirmed by the results from our laboratory.
 
Joined
Nov 6, 2018
Messages
85
Likes
166

D700

Member
Patreon Donor
Joined
Dec 21, 2018
Messages
50
Likes
38
Amirm has HD-AMP1 in for measurement, I've been bugging him for the review since I'm on the fence for one of these myself. Soon enough we'll have his review thread to discuss in detail. Thanks for all the info and links today!
 

maty

Senior Member
Joined
Dec 12, 2017
Messages
304
Likes
105
Location
Tarragona (Spain)
Last edited:

D700

Member
Patreon Donor
Joined
Dec 21, 2018
Messages
50
Likes
38
I use it mostly on KEF LS50. Shouldn't be too hard to drive. Same thing happened on the G3 and on old Tannoys.
Ugh...this is what I feared with the HD-AMP1. I bought the LS50s unheard, was considering the B&W 705 S2 as it was more efficient but several German publications championed the pairing with LS50. What SPL are you getting before protection kicks in?
 

Theo

Active Member
Joined
Mar 31, 2018
Messages
197
Likes
96
You can buy an assembled and tested stereo Hypex amp from Nord in the UK for about what Hypex charges for 2 Mono kits.
https://www.nordacoustics.co.uk/nord-one-up-nc500-power-amplifiers NC500, 1254 GPB including shipping to the US. Note, you will probably need a preamp to drive this.
I had a look at the Nord website. They propose two versions of their amp : the standard one with an Hypex input buffer and the "UP" version with their discrete Op amps input buffer card. They claim that their own design gives "better dynamics and a richer, warmer more musical tone"... However, their distortion figures are the same (excellent at <.001%). So where does the "warmth..." come from?:oops: Maybe from the extra £115 they charge for the UP version?
 

Ron Texas

Addicted to Fun and Learning
Joined
Jun 10, 2018
Messages
822
Likes
395
Location
Equidistant From Everywhere
I had a look at the Nord website. They propose two versions of their amp : the standard one with an Hypex input buffer and the "UP" version with their discrete Op amps input buffer card. They claim that their own design gives "better dynamics and a richer, warmer more musical tone"... However, their distortion figures are the same (excellent at <.001%). So where does the "warmth..." come from?:oops: Maybe from the extra £115 they charge for the UP version?
LOL, for that incremental amount one could warm up with an electric blanket.
 
Joined
Nov 6, 2018
Messages
85
Likes
166
Ugh...this is what I feared with the HD-AMP1. I bought the LS50s unheard, was considering the B&W 705 S2 as it was more efficient but several German publications championed the pairing with LS50. What SPL are you getting before protection kicks in?
I'll try to get measures (it's on the Gyia at the moment). Subjectively, Pink Floyd's The Wall never gets as punchy as it should be: a 20 yo cheap Yamaha does much much better. That being said, at long term listening level, it is a nice combination of a decent amp and DAC. I had the opportunity to listen to them side by side with LS50 wireless and those sounded much much better. As other have said, those LS50 need power.
 

Frank Dernie

Major Contributor
Patreon Donor
Joined
Mar 24, 2016
Messages
1,105
Likes
1,050
Location
Oxfordshire
I'll try to get measures (it's on the Gyia at the moment). Subjectively, Pink Floyd's The Wall never gets as punchy as it should be: a 20 yo cheap Yamaha does much much better. That being said, at long term listening level, it is a nice combination of a decent amp and DAC. I had the opportunity to listen to them side by side with LS50 wireless and those sounded much much better. As other have said, those LS50 need power.
Most small speakers need power since in order to get a modicum of bass out of a small box the drive unit ends up heavy. The most efficient speakers needing the smallest amplifiers are the biggest! Not what is usually expected but true.
The problem that goes with it as well is that small speakers tend to have less ability to handle power, because the bits are small and so their maximum output is less anyway.
 

D700

Member
Patreon Donor
Joined
Dec 21, 2018
Messages
50
Likes
38
That being said, at long term listening level, it is a nice combination of a decent amp and DAC.
In my case, this is for an office system. I was planning for 40% Headphone, 40% Nearfield use with the LS50...at my desk I'll be 4 feet from each speaker.
 
Joined
Nov 6, 2018
Messages
85
Likes
166
In my case, this is for an office system. I was planning for 40% Headphone, 40% Nearfield use with the LS50...at my desk I'll be 4 feet from each speaker.
In that scenario, very little to complain about. You won't need to blow your head off anyway. I know this is subjective, but that is an amplifier that isn't tiring. It is usually in my office as well, but I have a long rectangular on and I sit 6 or 7 meters away from them. If I had to buy again now, I would probably go for the LS50 wireless in the same position or the LSX closer (heard them at the dealer, not in my environment though)
 

D700

Member
Patreon Donor
Joined
Dec 21, 2018
Messages
50
Likes
38
I would probably go for the LS50 wireless in the same position or the LSX closer (heard them at the dealer, not in my environment though)
I took a hard look at the LSX, can't believe they didn't include a USB-B...thanks for the info! Sorry to derail the thread on the Hypex..definitely considering building my own for my larger listening area.
 

maty

Senior Member
Joined
Dec 12, 2017
Messages
304
Likes
105
Location
Tarragona (Spain)
https://www.doctorproaudio.com/doctor/calculadores_en.htm#calc_spl

Calculators/Audio/Acoustics/SPL

Usually I listen to at 65 dB continuous. Like more of my music has DR 15 -> I need 80 dB.

80 dB continuous is loud in a home. With DR15 -> 95 dB.

SPL-83db-60w-3m.png


In phase (near field): + 3dB -> 97.2 dB

At THD 0.1%, at 4 ohms the amp almost 80 watts. At 6 Ohms must be 55-60 watts. You need an amp that offers those watts without taking it to the limit. And the SMPS stress much more than linear sources, and probably Marantz has spared.

LS50 wireless is a very good choice, if you have the money. Woofer with class D and tweeter with class AB. Thanks to the DSP they can be over a desktop, without feets. And do not need 90 cm to the three walls. And has more bass.

LS50 need watts and one/two good subwoofer.

LSX is bad choice. 4" and... ALL class D. Well, if you listen bad recordings...

 
Last edited:
Joined
Nov 7, 2018
Messages
40
Likes
31
SPL calculators provide a useful reference point, but I only find them useful for making relative comparisons e.g. considering new speakers without changing any other variable. The size of your room, whether it is open to other rooms, and musical tastes all have a large effect on power requirements. Consequently, everyone should go through this test to get an idea of how much power they need in a given setting. The results can then be used to temper expectations when using an SPL calculator to evaluate multiple variables.
 

Similar threads

Top Bottom