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Hypex NCx500 Class D Amplifier Review
- Thread starter amirm
- Start date
It's -0.05dB at 20Hz, so it definitely goes lower.
You can see the plot down to 10 Hz in amirm's review -- it is down a fraction of a dB at 10 Hz.
www.audiosciencereview.com
Hypex NCx500 Class D Amplifier Review
This is a review and detailed measurements of the Hypex NCx500 NCOREx reference design amplifier. It was sent by the company and kindly assembled by our local expert, @Rick Sykora. As you see the sample is a "monoblock" configuration (one channel) driven by Hypex SMPS1200 switching power...
www.audiosciencereview.com
ivo.f.doma
Active Member
For example? I have never heard of such a thing.
The datasheet does not even list low frequency response limit, so I would assume down to DC.
A number of pro amplifiers, particularly with DSP, include such protection. Crown told me several years ago that the XLS series rolls off at 12 dB/oct below 20 Hz. Using DSP filters the roll-off is 24 dB/octave.
AFAIK it is faily common for amp manufacturers to add a high pass cap to the pre-amp section to remove DC bias.
Example the PS Audio below is specced above 10 Hz.
www.psaudio.com
Or D'Agostino Momentum has -1dB at 20 Hz already.
Or Hegel H590 starts at 5 Hz.
Or the flagship Accuphase -0.2 dB at 20 Hz "at rated continuous average output".
Or Pass XA350.8 at 1.5 Hz.
etc
Example the PS Audio below is specced above 10 Hz.
BHK Mono 300 Power Amplifier
When you are unwilling to compromise performance we offer the BHK 300 Signature 300 watt Monoblock power amplifiers. They are among a rare handful of amplifiers capable of uncovering music's rich tapestry in a lush, uncompromised, effortless presentation.
Or D'Agostino Momentum has -1dB at 20 Hz already.
MOMENTUM M400MxV MONOBLOCK AMPLIFIER | Dan Dagostino amplifiers
Innovative Cooling with Venturi Style Heatsinks
dandagostino.com
Or Hegel H590 starts at 5 Hz.
Or the flagship Accuphase -0.2 dB at 20 Hz "at rated continuous average output".
Or Pass XA350.8 at 1.5 Hz.
X350.8 - Pass Labs
At 350 watts per channel class A/B, the X350.8 is the largest and most powerful stereo power amplifier of Pass Labs line-up. Because we care more about how holistic design affects the musical experience and relatively less about how parts … Continue reading →
www.passlabs.com
etc
The NC400 is DC-coupled. I assume the same is true for the NC500.
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Get NCx500, much better :
The NC500 may be a good deal right now, but unless it uses a good custom buffer, would go with the newer NCx500. Would not worry about sound but features. The gain choices are more easily made on the newer module. The stock NC500 buffer board is a evaluation interface and not intended as a production board. Notably, the eval board lacks RFI filtering. Am not sure whether the NCx500 implements any better RFI filtering; @SIY may know from his testing.
NC500 availability is much better currently too.
The dog that didn't bark. I didn't do RFI testing but never experienced any issues with it.
He meant the NC500MP, the mono mains powered module, not the former NC500OEM module.
Thanks, missed that and will address.
Got confused with someone who emailed me and insisted on separate power supplies for his amp.
Updating my last reply to include the NC500MP option…
The Hypex MP modules are a very attractive value. They do have some RF filtering. I really like the mono NC500MP, but it is not commonly sold. If buying from VTV, might check on the age of the module. Recently found VTV had mixed newer stereo modules with older mono ones. Normally, might not be an issue, but the older MP revs had some noise glitching in power transitions.
Not many (aside from the one I mentioned above), but is really the vendors’ responsibility. Not too surprising that revision histories are not shared more publicly as detractors and competitors could weaponize.
Afaik, none of the “firmware” on these modules can be updated externally so no major motivation to publish revision diffs either.
I asked the question to Purifi a few months ago. There is one single firmware for everybody, including companies licensing the design (NAD, T+A,...).
Outside of power supply performance, measured differences between amplifiers are due to measurement methods and the relatively low accuracy of the short circuit protection.
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