Mini review: Class-D Designs NX200 vs Hypex

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#83
Sorry for the delay with the amp. Been away this week with work and still waiting for the thermal pads for the mosfets. I'm going to try to build the amp using the module 'as supplied' - then assess - then replace PSU, coupling and feedback caps. I've got Rubycon ZLH and epcos MKV caps ready and waiting - for feedback I'll either use two paralleled fostex 25uF film caps or the new 22uF Wima MKS 2-xl caps I have on order.

Give me a week ;-)
 
#84
cirrus18 said:
He thanked me.
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I thanked you for what now? Wait, never mind. I just remembered I don't care.

cirrus18 said:

My review of the NX200 is exactly the same as that of the Hypex, if you accept one in good faith then you must also accept the other one. You can't pick and choose depending on the flavour of the month and your own personal preferences.
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I didn't really accept either. I took the information for what it was. You hooked up one amp and liked it, you hooked up another amp and also liked it. That's the only real information I received from either review.

Let's stop pointing fingers and accusing and attacking each other and just look at some facts if you really want to compare something in a civilized manner. To keep things fair let's talk only of design, product features, company product support, build quality, etc. Sound quality based on listening tests is subject to opinion among many other factors and cannot be viewed as fact and IMO without some supporting data shouldn't really be viewed as information either.

Here's a proposal for you:
I'll make a list of comparing what I know about the two different products, and then you list what you know. We can compare, and forum members can come to their own conclusions of who "wins" or what they should buy, or which amp belongs in what forum, or whatever. 😉

Hypex (Tulips?):
-company has strong reputation with excellent product support
-company designs it's own products
-accurate specifications including plots of THD vs freq, intermodulation, THD vs power, frequency response vs load
-modules are factory tested to perform exactly as indicated in spec sheet
-high efficiency patented UcD design with very low EMI
-differential input
-plug and play

"Class-D" NX200 (Petunias?):
-inaccurate spec sheet including false claims of power capability
-outsourced design which has been improved in-house by the "Class-D" company apparently
-company name is very misleading especially considering it's product lineup
-lacking quality control (freebies received by forum members did not meet IPC soldering specifications)
-low efficiency class-AB design (ie. doesn't belong in this forum)
-not plug and play. Bias current must be set manually by the customer, which influences performance (distortion and efficiency)
-due to above bias adjustment, we can assume that the products are not tested at factory to meet any published specification
-no mention of the required bias adjustment on manufacturer's website
-single ended input
-16 Euro cheaper than Hypex UCD180ST

I think that about sums up my product comparison. If you think that any of the above points are incorrect or inaccurate, please feel free to show me data which proves otherwise. Maybe you know something that I don't, and who knows, maybe you'll change my mind. In any case, providing such information here will allow others to decide for themselves whether my above points are true or false.
 
#85
DcibeL said:

e
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DcibeL. Why don't you just go and see a taxidermist.

It's a complete waste of time me replying to any of your silly comments. My review was only to show (in my own personal opinion) the sonic qualities of NX200 compared with Hypex and nothing else. Your remarks outside this parameter are of no consequence to me and therefore ignored.

We have also had another favourable review here by flight1, but you still go on rubbishing everything. You are beneath contempt. Particularly as you have never had the guts to put your money where your mouth is by purchasing one of these amplifiers, getting some practical experience and giving us a review based on your own actual experience.

Nobody who had the free amplifiers or myself who purchased 6 and flight1 with his 5 have reported any failures or nor has anybody else for that matter. So the quality can't be that bad.
As far as the adjusting of the bias is concerned is just common sense to set it up to one's own particular power supply voltage and not rely on the factory setting.

Hopefully, I've done a few forum members a favour and that was my intention here by pointing out that for about than the price of one Hypex module you can build yourself a complete NX200 stereo amp together with the case, power supply, transformer etc. with a sonic performance equal or even better than that all the more expensive Hypex 180HG.

I will leave that as my legacy on this thread because all this backbiting is just too childish for words and not what I became a forum member for. This is me finished on this thread as my time is too precious to waste on this cr+p.
 
#86
If someone you've never met tells you that jumping off bridges is good times, do you give it a try?

Originally posted by Cirrus18

Hopefully, I've done a few forum members a favour and that was my intention here by pointing out that for about than the price of one Hypex module you can build yourself a complete NX200 stereo amp together with the case, power supply, transformer etc. with a sonic performance equal or even better than that all the more expensive Hypex 180HG.
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You can buy all that for 105 euro?

2 NX200 modules - 88 Euro
transformer, rectifier, caps, chassis, connectors - 17 Euro? Really?

I've tried to reason with you, I've tried to show you my point of view, but all you want to do is attack me by saying anything I say doesn't matter because I didn't invest in this product. You just seem to get more and more upset the more I tell you that I don't care how good you think it sounds. There are more factors than that alone to choose a quality amp, which is what I wanted to discuss.

Your legacy is a great one Cirrus, one to tell my grandchildren about some day. A passionate story of one man's love for some fishy electronics. There are laughs, and there are tears, and in the end everyone lives happily ever after. 😀

Here's to wishing you well in your future endeavours. :drink: Fair well, Cirrus18.
 
#88
DcibeL said:
Originally posted by Cirrus18
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[/b]
Hopefully, I've done a few forum members a favour and that was my intention here by pointing out that for about than the price of one Hypex module you can build yourself a complete NX200 stereo amp together with the case, power supply, transformer etc. with a sonic performance equal or even better than that all the more expensive Hypex 180HG.
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You can buy all that for 105 euro?

2 NX200 modules - 88 Euro
transformer, rectifier, caps, chassis, connectors - 17 Euro? Really?
Click to expand...

Have you actually bought a Hypex amplifier for 105 euro?
For a start this is the ST version you are pricing
The HG version, which is what this review compared the NX200 against, is actually 165 euro + VAT (Sales Tax)
This is for a monoblock, so you need 2 of them ie 320 euro + VAT = 392 euro[/B]

2*NX2000 modules = 2*40 euro + VAT = 88 euro

So a working Hypex stereo will cost 392 euro
A working NX2000 stereo will cost 88 euro

So Dcibel, who is the one showing a lack of objectivity? I think the reviewers have something to tell about these modules - you have nothing to tell!
 
#89
Originally posted by jkeny
Have you actually bought a Hypex amplifier for 105 euro?
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Actually I bought two UcD180ST for less than 100 euro.

Prices I listed came from https://www.hypexshop.com/ as of today.

UcD180ST 60 euro
UcD180HG 105 euro
UcD180HG with HXR 165 euro

cirrus18's amp does not have HxR.

The point list above is what I have to tell...a summary of findings through searching this forum and exchanging a few emails with the designer of the NX200. aka nothing. Yup, all there really is to tell about anything is whether it sounds good or not. No, don't need to anything about what you did to determine how good it sounds or not. Don't need to know anything about the test conditions, a simple yes or no will do for me. Nothing else matters.

Whatever, I don't care anymore. I said what I wanted to already, I don't have anything more to say about Class-D Design Ltd or the NX200.

Have a lovely mother's day.
 
#90
jkeny said:
So a working Hypex stereo will cost 392 euro
A working NX2000 stereo will cost 88 euro
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Have you accounted for bigger power supply, heat-sinks, extra cooling, wasted energy, air conditioning, extra real estate, and sedatives you'll need to sleep every time someone points out that "NX200 by Class-D designs" is not "Class-D"?
:umbrella:

Real class-d have higher price points for several valid reasons, but can actually have a higher ROI in many applications.
 
#91
I accept your correction, Dcibel, - point is UCD180HG list price for stereo is ~250 euro; list price for NX2000 is 88 euro - is the sound quality of UCD 3 times the NX?

raintalk said:


Have you accounted for bigger power supply, heat-sinks, extra cooling, wasted energy, air conditioning, extra real estate, and sedatives you'll need to sleep every time someone points out that "NX200 by Class-D designs" is not "Class-D"?
:umbrella:

Real class-d have higher price points for several valid reasons, but can actually have a higher ROI in many applications.
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LOL raintalk - I like your humour :joker:
 
#92
jkeny said:
UCD180HG list price for stereo is ~250 euro; list price for NX2000 is 88 euro - is the sound quality of UCD 3 times the NX?
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Oi...The point I have been trying to make, for the umpteenth time, is that sound quality is only one of many factors to consider. The importance of each of these many factors is up to you to decide.
 
#94
when things all saying from start deceit so far strangest thinking it true selling public sound quality likings that only he liking. Can still one thing have true from same seller? Good for enough friend to agreement. Not mattering how many join sounding like, wrong not making right because they saying. Hello, I having to same question and now have answer for you to share so I joining with agree. It more giving people question but when asking mike or cirrus they both saying same idiot, can to be both classdphile? Strange how cry at not understood and make fun at mine language. Moderator doing nothing even tired and delete crying sorry because it old to believing. "Why i always get blame oops sorry". Saying same thing in all thread it must still be undelete some in them.

Can cirrus expliquing what piezo coupling input add to sounding good thing and why he prefer piezo coupled input over fidelity quality film coupling? jkenny you seeming in agree this importatnt to good sounding? Can also saying how bias unset board untested and pcb solder not good how can repair? Seeming like output propriety blend of floor sweeping, making for disposibility because. Is moot? Is just what cirrus saying mean for sound quality for selling and all rest off topic in cirrus class d discution. Can no ask even question only one answer and it all same idiot. If it true then you knowing more so can have real answer.
 
#95
It's a discussion forum. I'm just another foolish audiophile.

As far as all research I can find in actual published double blind tests, humans cannot actually hear the difference between two amps that measure within micro percentages of each other. Two amps that measure (close to) the same sound the same.

Anyone who claims to hear a difference is usually suspect to setup problems like one amp is more sensitive than the other and the gains haven't been matched. Stereo store salesmen wearing plaid pants turn the amps up they want you to buy a just little more than the ones they don't. Foolish humans.

So how about some backup measurements to the nx200 claims? Hypex bares it soul - measurements are there for all to see. They have nothing to hide. Same for several class-d manufacturers.

I have a drinking game I play that every time I read in an audio forum a description like "clarity", "dynamics", "soundstage", "warm","presence" that aren't backed up with any measurements I take eye dropper of beer. I haven't been sober in years.

:umbrella: (My umbrella is actually a spit shield)
 
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