• 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!

Hypex UcD180HG HxR amplifier module analysis and review

OP
pma

pma

Major Contributor
Forum Donor
Joined
Feb 23, 2019
Messages
3,010
Likes
6,039
Location
Prague
I was unaware that they could pull 1 ohm. More & more I am starting to see a reason to switch. Perhaps when I (if) retire in 2 years...I may switch. Or get one for the subs & then, later one for each channel.

You will find the info on minimum allowed load impedance in a datasheet of the product, if it is a trustworthy and reliable manufacturer, like Hypex is. Please find several examples below.

UcD180_min.png


UcD400_min.png


NC122_min.png

NC252_min.png

NC500_min.png


However, not every manufacturer is providing such info. That might be a hint, if you are seeking for a reliable product.

It may seem to be unimportant, but it is not. The EPDR (equivalent power dissipation resistance) of event the speakers that may seemingly appear as a light load often falls down to 2 ohm or lower. As an example, below is an impedance plot of my 3-way Quadral Ascent 90 speaker. Though the impedance magnitude is everywhere above 3.7 ohm, EPDR falls down to 2.4 ohm. People often forget or cannot read the influence of phase response, they just look to magnitude response only. Then surprised with some speakers and amplifier failure.

Quadral_Ascent90_impedance.png
 
Last edited:

EJ3

Major Contributor
Forum Donor
Joined
Dec 10, 2019
Messages
1,083
Likes
810
Location
James Island, SC
You will find the info on minimum allowed load impedance in a datasheet of the product, if it is a trustworthy and reliable manufacturer, like Hypex is. Please find several examples below.

View attachment 170606

View attachment 170607

View attachment 170608
View attachment 170609
View attachment 170610

However, not every manufacturer is providing such info. That might be a hint, if you are seeking for a reliable product.

It may seem to be unimportant, but it is not. The EPDR (equivalent power dissipation resistance) of event the speakers that may seemingly appear as a light load often falls down to 2 ohm or lower. As an example, below is an impedance plot of my 3-way Quadral Ascent 90 speaker. Though the impedance magnitude is everywhere above 3.7 ohm, EPDR falls down to 2.4 ohm. People often forget or cannot read the influence of phase response, they just look to magnitude response only. Then surprised with some speakers and amplifier failure.

View attachment 170613
Thank you! My pair of subs are a dual 4 ohm voice coil 12" Pioneer (automotive competition) speakers which I run the circuit as a 2 ohm circuit. The FR is only 20 Hz-80- Hz. I no longer remember the specs but my NAD 2200 has had no problem with the 2 ohm load. And I did check the ohm phase shift impedance way back when I set them up. And it was a good match. For several years now the amp seems to have no problem
with the load. BUT I only run 1 amp in stereo with the subs,. For the mains I run a NAD 2200 bridged mono 4 ohms each for the L & R mains.
 
OP
pma

pma

Major Contributor
Forum Donor
Joined
Feb 23, 2019
Messages
3,010
Likes
6,039
Location
Prague
I would like to debunk a myth of "constant or fixed switching frequency" of class D amplifiers. For self-oscillating PWM modulators, which is the case of both hysteresis switching (TPA like) and phase controlled switching (Hypex, Purifi) the switching frequency is a function of output amplitude. With higher amplifier output voltage (power) the switching frequency is decreasing, usually according to parabolic function. This is shown below in the measurement of wideband spectrum at UcD180 output. The signal is 955Hz, 24.55Vrms/6.8 ohm. Please note that the switching frequency is travelling from 400kHz down to some 90kHz. This is one of the reasons why wideband THD+N measurements accelerate rocket high at frequencies >10kHz and wide measuring bandwidth.

UcD180_1kHz_wideband_spectrum.png
 
Last edited:

restorer-john

Master Contributor
Joined
Mar 1, 2018
Messages
8,934
Likes
25,108
Location
Gold Coast, Queensland, Australia
Personally I like the UCD-180hg-hxr. I think it's a sweet little thing, nicely made, devices properly attached to a block of aluminum and did I say compact?

Thanks @Pavel for your in depth analysis of this module. A pity your trafo used was only 100VA.
 
OP
pma

pma

Major Contributor
Forum Donor
Joined
Feb 23, 2019
Messages
3,010
Likes
6,039
Location
Prague
Personally I like the UCD-180hg-hxr. I think it's a sweet little thing, nicely made, devices properly attached to a block of aluminum and did I say compact?

Thanks @Pavel for your in depth analysis of this module. A pity your trafo used was only 100VA.

Thank you John. I was/am thinking about buying the SMPS400A180 power supply, produced by Hypex especially for this amplifier module. However, it would make further €109, or €129 with cables and shipping, to get few W more. Maybe I will be so curious and will do it, not sure. The other option would be a PSU in my main 2x250W amplifier, but it gives about 2x57V and it is 1V above absolute maximum of UcD and the module would most probably not start, as it has overvoltage protection set to 2x56V.
 
Last edited:
OP
pma

pma

Major Contributor
Forum Donor
Joined
Feb 23, 2019
Messages
3,010
Likes
6,039
Location
Prague
OP
pma

pma

Major Contributor
Forum Donor
Joined
Feb 23, 2019
Messages
3,010
Likes
6,039
Location
Prague
UcD180HG THD+N distortion vs. power at 1kHz into 4ohm, 6.8ohm and 10 ohm load. Measured with my new "classD" measuring RLC filter.

UcD180_thdn_@22kHz_4R-10R.png


classD_filter_FR.png
 
Last edited:

opel

Member
Joined
Dec 30, 2021
Messages
26
Likes
0
Measurements into 2.5 ohm load

View attachment 170320
Please note that maximum power is limited by the 100VA transformer in my power supply.


View attachment 170324

Please note that Hypex UcD180HG has almost no issues with increasing distortion with frequency and that even with demanding 2.5 ohm load. This measurement was made especially for @restorer-john , he will know why (90 kHz measuring bandwidth, 192kHz Fs) to show that properly designed class D has no violent rise of distortion with frequency. Yes that is Bruno and Hypex and proper class D topology.
Hello. I will now build myself an amplifier with 2 pcs. hypex ucd180st. i will use 48v 800w LLC power suply.
The choice was between 500w and 800w the price difference was small so I chose 800w. How many watts do you think I can get out of the amplifier?

Have just ordered cash and power supply from alieexpress.

Has compared the ucd180st to many other 80's 90's mid-range amplifiers and it beats many in sound quality. ucd180st beats all cheap class-d amplifiers from ebay on sound quality. hypex ucd180st is a very good amplifier in mini size.
 

opel

Member
Joined
Dec 30, 2021
Messages
26
Likes
0
Hello. I will now build myself an amplifier with 2 pcs. hypex ucd180st. i will use 48v 800w LLC power suply.
The choice was between 500w and 800w the price difference was small so I chose 800w. How many watts do you think I can get out of the amplifier?

Have just ordered cash and power supply from alieexpress.

Has compared the ucd180st to many other 80's 90's mid-range amplifiers and it beats many in sound quality. ucd180st beats all cheap class-d amplifiers from ebay on sound quality. hypex ucd180st is a very good amplifier in mini size.
 

opel

Member
Joined
Dec 30, 2021
Messages
26
Likes
0
Why is no one mentioning how much volt power supply they use? Volt in has a lot to say about how many watts you get out.
 

NTK

Major Contributor
Forum Donor
Joined
Aug 11, 2019
Messages
1,601
Likes
3,261
Location
US East
Why is no one mentioning how much volt power supply they use? Volt in has a lot to say about how many watts you get out.
OP mentioned that the transformer he used was 2x32V 100 VA, and was undersized for the UcD180. The PS is unregulated and therefore its no load DC output is about ±45 V (= 32 * sqrt(2)).

The matching PS from Hypex for the UcD180 is SMPS400A180 (link) and its nominal output is ±46 V. The max power supply voltage per UcD180 datasheet is ±50 V.
 
  • Like
Reactions: pma

opel

Member
Joined
Dec 30, 2021
Messages
26
Likes
0
OP mentioned that the transformer he used was 2x32V 100 VA, and was undersized for the UcD180. The PS is unregulated and therefore its no load DC output is about ±45 V (= 32 * sqrt(2)).

The matching PS from Hypex for the UcD180 is SMPS400A180 (link) and its nominal output is ±46 V. The max power supply voltage per UcD180 datasheet is ±50 V.
Hello. I will now build myself an amplifier with 2 pcs. hypex ucd180st. i will use DC
48 +- 800w LLC switching power suply.
The choice was between 500w and 800w the price difference was small so I chose 800w. How many watts do you think I can get out of the amplifier?
 
OP
pma

pma

Major Contributor
Forum Donor
Joined
Feb 23, 2019
Messages
3,010
Likes
6,039
Location
Prague
OP mentioned that the transformer he used was 2x32V 100 VA, and was undersized for the UcD180. The PS is unregulated and therefore its no load DC output is about ±45 V (= 32 * sqrt(2)).

The matching PS from Hypex for the UcD180 is SMPS400A180 (link) and its nominal output is ±46 V. The max power supply voltage per UcD180 datasheet is ±50 V.
Absolutely correct.


The SMPS to be paired with is

in stock here
 
Last edited:

NTK

Major Contributor
Forum Donor
Joined
Aug 11, 2019
Messages
1,601
Likes
3,261
Location
US East
Hello. I will now build myself an amplifier with 2 pcs. hypex ucd180st. i will use DC
48 +- 800w LLC switching power suply.
The choice was between 500w and 800w the price difference was small so I chose 800w. How many watts do you think I can get out of the amplifier?
The UcD180 datasheet performance is, with ±45 V power supply, max output is 180 @ 4Ω and 120 W @ 2Ω, both THD=1%. I'd expect you will get the datasheet numbers.
 
OP
pma

pma

Major Contributor
Forum Donor
Joined
Feb 23, 2019
Messages
3,010
Likes
6,039
Location
Prague
The UcD180 datasheet performance is, with ±45 V power supply, max output is 180 @ 4Ω and 120 W @ 2Ω, both THD=1%. I'd expect you will get the datasheet numbers.
Even more. The UcD180HG HxR datasheet R5 allows up to 2x56V supply voltage, then it shuts down. The T-shaped heat spreader works well and I recommend to screw it to the good heatsink as I did.
 
  • Like
Reactions: NTK

levimax

Major Contributor
Joined
Dec 28, 2018
Messages
1,367
Likes
1,978
Location
San Diego
Did you measure the self noise / hiss of the amp when idle? How about DC offset? I am curious as these seem like they would be good for a DIY active self powered speaker. Regarding the Neurochrome Mod 86 amps, I use them in a tri-amp set up and they are dead quiet even wired directly to a tweeter and have virtually no DC offset.
 
OP
pma

pma

Major Contributor
Forum Donor
Joined
Feb 23, 2019
Messages
3,010
Likes
6,039
Location
Prague
Did you measure the self noise / hiss of the amp when idle? How about DC offset? I am curious as these seem like they would be good for a DIY active self powered speaker. Regarding the Neurochrome Mod 86 amps, I use them in a tri-amp set up and they are dead quiet even wired directly to a tweeter and have virtually no DC offset.
Output noise voltage is 72uV/BW20Hz-22kHz unweighted (twice the noise I measured from NC252MP). DC offset is 6mV. But it is just one module, I cannot guarantee it would be same with other modules. You may ask at Hypex tech. support, they are very responsive.
 
Top Bottom