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BUCKEYEAMPS Hypex NCx500 Amplifier 2channel Review
- Thread starter thin bLue
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Actually they said so in the power amp modules datasheet too, and I believe I posted that part, but will double check later. The clearly stated the amp modules are rated 700 w peak output, never claimed it was continuous.
Have a dance party and see…One question remains for me: It possible that an home user produce the same disaster as happened on the test bench with a musical program?
I see "guarded @ 27 amps" but also "Do not exceed or there will be damage" so not sure how it works but to me the 27 amp limit is a limit to prevent fires but not nessisarily save the PS but I could be wrong.
These are the NCx500 limits...
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We've done a lot of testing with these modules. It makes a difference if you mount the Hypex power supply on a 3mm thick aluminium baseplate or 10mm aluminium baseplate. When you provide a better passive or active cooling to these modules, they will output higher continuous power. It is the amplifier modules that generate the most heat. The transistors are mounted on the bottom of the amplifier module. So mounting this module to a 10mm aluminium plate or heatsink will result in a lot higher continuous power than when mounted on a 3mm thick aluminium plate for instance. So the continuous power depends on how the manufacturer implements these modules in their design.
BUCKEYEAMPS Hypex NCx500 Amplifier 2channel Review
It could be interesting to know how long it was demanded to this amp to run over 100W continuously, If it had been running above 325W more than 10 sec, if proper cooling time was done in between tests. Again not that he should have, but good info to assess I agree. That is a fair question...
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I agree that HypeX is not at fault.
But it’s worth nothing that Marantz uses a quartet of NC500OEMs and a pair of SMPS600s for bridged dual mono, and they just quote 200W into 8 ohms
Which is pretty close to HypeX’s 100W continuous rating for a single NC500.
HypeX is like ESS or AKM. They have a theoretical max performance of the design but the finished product is responsible for defining the spec. This is where I ask Buckeye and others to just be clearer.
Separately, I think @thin bLue has shown both Yamaha and Buckeye amps that fail. Yamaha is just as guilty of bad protection circuitry.
There are two separate issues to discuss.
1) how should vendors advertise?
2) what level of protection/reliability is desired?
Even if you only advertise 100W, should an amp be able to shut down gracefully if you overload the input? Or it overheats? Or is asking for premium protection circuitry limited to McIntosh “Power Guard” and high-end luxury products? Fancier luxury cars have fancier driver assistance features.
These questions are fully relevant now that we are in the era of good performance at low costs.
Sokel
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Self guarded by the module?
So hopefully retesting with the new SMPS will show no harm to them,that confirms what @Buckeye Amps thinks too about the failure.
That's the same datasheet I referred to, in which it specified the 700 W as "Peak" and under the "Continuous" rating space was left blank, with note 1:BUCKEYEAMPS Hypex NCx500 Amplifier 2channel Review
It could be interesting to know how long it was demanded to this amp to run over 100W continuously, If it had been running above 325W more than 10 sec, if proper cooling time was done in between tests. Again not that he should have, but good info to assess I agree. That is a fair question...
So, Hypex did not specify a continuous rating, period. It will be up to the builder to implement their "thermal system" and then they could provide the continuous rating. And that's why I suggested what buckeyeamp should do, in regard to their specs.
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Schollaudio
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Keep in mind with music power the dynamic peaks are so fast the PSU won't be so taxed.
Not that easy. Read heading 8.
The SMPS1K-PFCR2 is the closest SMPS to compare to the HYPEX SMPS1200.
The SMPS1K-PFCR2 brings with it the following futures.
- Active power corrector, to increase the efficiency of the SMPS & allows a wide AC input range.
- Standby power consumption is less than 0.2W.
- Onboard standby power supply.
- Onboard inrush current limiter and turn on delay control.
- Stable DC output voltage at any AC input voltage as low as 85VAC.
Hope that helps
There is a spec sheet on the exact same page you linked. It may be time for a break now.
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Carry On and please be civil. Pretty please
Apologies if I am misunderstanding as I'm a total layman, but is this effectively saying the maximum continuous power (presumably for any length of time longer than 10 secs) one can safely achieve from the supply, assuming a sufficient cooling solution (i.e not exceeding 95 celsius), is 325W across both channels? Not a problem in real world usage at all but definitely worth knowing for test cases such as this?
It assumes a continuous to peak power ratio of 1/8, Imho a conservative enough figure for any musical program.
Of course not apt for torture tests as submitted by the OP.
My interpretation was that with sufficient cooling it can maintain max output not "steady" output. But that requires the system integrator to do additional work to maintain the temperature. The board itself is guaranteed for 10s without any additional thermal work by the integrator.
Right. And I think what this review/measurement is showing us is that we don’t really know what “sufficient cooling” is and the protection doesn’t kick in reliably in the way we think (from a failed Power supply; in contrast to Marantz’s implementation which has some vendor specific protection circuits).
If you look at this, it’s tricky because you have soldering irons which are 15 watts and of course, the easy bake oven, originally used a lightbulb of 100W.
Heat Sink Size Calculator | Celsia
Free online calculator used to estimate heat sink size during the initial design phase. Designed for mechanical and thermal engineers.
celsiainc.com
This lets you see how hard or easy it is to deal with heat when you don’t have a fan.
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