• Welcome to ASR. There are many reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

Apollon NCx500ST Stereo Amplifier Review

Rate this amplifier:

  • 1. Poor (headless panther)

    Votes: 5 1.0%
  • 2. Not terrible (postman panther)

    Votes: 6 1.3%
  • 3. Fine (happy panther)

    Votes: 34 7.1%
  • 4. Great (golfing panther)

    Votes: 434 90.6%

  • Total voters
    479
Are you saying that 2 ohm load would not affect the Hypex modules as much as in case of a "traditional" class AB amplifier? I really do not think so. I have tested for you, 2 amplifiers into 2.2 ohm load. My apologies I do not have exactly 2 ohm.

The amplifiers are my A250W - class AB and my NC252MP - class D. They both are rated 2 x 250W/4ohm and they both have almost same power into 4 ohm load. The result into 2.2 ohm load is bellow:

View attachment 470460

The class AB amp has THD = 0.1% at 326W. The class D amp has THD = 0.1% at 200W, however soon after that the protection shuts the class D amp down. So it is definitely not "less affected" by the 2 ohm load, the opposite is true.

View attachment 470465 View attachment 470466
I was referring to the nc500x module and the referenced Purifi. Thanks for the information!
 
Why we talk about a technology based on only one sample case or implementation?

Hey, somebody died with electrical current, electricity is too much dangerous, please, we need to go back to candles.
Damn, the Christmas tree caught the house on fire (yeah, we keep it up until it's good 'n dry), then stuff it up the flue & light it off.
I guess that we need to just stay in darkness now to prevent that from happening.
 
I am wondering about audible differences. I have a Marantz SR7012 AVR. Right now I'm using its internal amps. If i use NCx500 connected to its preamp outs, but don't need the extra power, will there be an audiable difference? Speakers are Revel F32
 
I am wondering about audible differences. I have a Marantz SR7012 AVR. Right now I'm using its internal amps. If i use NCx500 connected to its preamp outs, but don't need the extra power, will there be an audiable difference? Speakers are Revel F32
I expect an improvement, especially at the low end. The NCx500 keeps it's power there where it's most needed, in the basses. Most improvement will be heard at somewhat higher sound levels.
 
I am wondering about audible differences. I have a Marantz SR7012 AVR. Right now I'm using its internal amps. If i use NCx500 connected to its preamp outs, but don't need the extra power, will there be an audiable difference? Speakers are Revel F32
Just to give you two nicely contradicting answers. No, if you don't need the power: If your Marantz is currently not clipping, then there will be no difference in sound between the internal and any external amp, at any frequency.

@Endiboi is partly correct that you will run out of power first at low frequencies, and that will be at higher sound levels - but if your statement that "you don’t need the power" holds, then your amp is *not* running out of power - even in the bass - is not clipping, and therefore an external amp with more power won't make any difference.
 
I expect an improvement, especially at the low end. The NCx500 keeps it's power there where it's most needed, in the basses. Most improvement will be heard at somewhat higher sound levels.
And, as we know all too well, if you expect an improvement there will be an improvement. :)
 
i think is better to add a subwoofer to the AVR than a new power amp ... cheaper and much more effective.
 
I am wondering about audible differences. I have a Marantz SR7012 AVR. Right now I'm using its internal amps. If i use NCx500 connected to its preamp outs, but don't need the extra power, will there be an audiable difference? Speakers are Revel F32
I don't know the specs or measured performance of your AVR, so can't say for sure. For me, switching from good but not SOTA AB amps and NAD-implemented UcD amps to my Apollon NCx500ST, the biggest noticeable difference was the ultra low noise floor when not in use (literally zero hiss on the tweeters of even my most high sensitivity speakers). It's not something I've ever experienced before, and it applies on the highest and lowest gain settings which makes it all the more impressive. In typical playback, I've not noticed any difference to my AB amps (and it would be totally unreliable and subjective if I had!). I've decided to stick with the Apollon because in my application I can use it in the lowest gain setting (12.8dB I think), and be content knowing that it's objectively the lowest noise option compared with my other amps with fixed gain around 30dB.
 
Last edited:
Website says no shipping available to US when I try to check out.

Yes, it's not just the amount, it's the added hassle. Many international companies have chosen to simply not ship to the US, at least for the time being.
 
Please enter the complete shipping address, including the postal code, so that the website can accurately calculate the shipping costs. We offer worldwide shipping.

Cart _ Apollon Audio Hypex Purifi Premium Amplifiers.jpg
 
Very odd... seems ok at my end;

View attachment 502747

Maybe its a browser issue, so possibly try another browser, incognito/private window or even a US VPN.


JSmith
I know from living 17 years in Saipan (which had 3 US Post offices there at the time [with USA Zip Codes]) that getting things shipped there sometimes took some odd, roundabout ways, as some companies would not ship things directly to there. Usually claiming that they could not ship to PMB or other non physical addresses (with no mail delivery service, no physical addresses and no street signs, a tough one to overcome).
But UPS, Fed/Ex and DHS would get it there (to their facility, you had to go pick it up (no different that USPS in that regard) for an exorbitant fee (much higher than the USPS).
Again: many companies just claimed: we don't do that, no matter what (even if USPS, UPS, FED/EX or DHS could). So...then what???
Then you had it shipped to a friend somewhere else, who would then ship it to your PMB.
Of course: a great pain in the butt (and sometimes wallet, when the resulting shipping cost exceeded the items cost).
Or, you decide that it wasn't worth the time, effort and cost and just did not do it.
 
Very odd... seems ok at my end;

View attachment 502747

Maybe its a browser issue, so possibly try another browser, incognito/private window or even a US VPN.


JSmith
Ok. Got it to work with Firefox. Tried again from beginning with Brave and voila! Winning! Thanks.
 

236 € …. That’s a hefty shipping fee … does that include Tariffs ?
I was playing around with it and it shows me @110€ for shipping to Texas .

If not , that’s an expensive amp considering the price of a NCx500 from Buckeye - which I would assume sounds identical.

Bk
 
Last edited:
Back
Top Bottom