Can you send a NC250MP model ?
Thy is the "better one" MP module according to Hypex Datasheet... i hope to see the measurements Versus the other one....
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March Audio P122 Class D Amplifier Measurements
- Thread starter amirm
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Can you send a NC250MP model ?
Thy is the "better one" MP module according to Hypex Datasheet... i hope to see the measurements Versus the other one....
It says into 4 Ohms, so I presume so. Best ask Amir.
I will send a P252 (we dont make a NC250 based mono) but it will be after the Sydney Hifi show in a few weeks. . I need the demo units for that.
Although I wouldn't expect you to trust them
, the Hypex data sheets do show accurate information.
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Ok, let's hear what he will say. What strikes me as odd is why using 5W resistor when you have (say) 150W or 250W resistor to measure performance under load at full power.
restorer-john
Grand Contributor
Realistically, March Audio's specifications for the unit have been confirmed in independent tests. Personally I don't agree with a Pout/2 (half power) THD figure being headlined in the official rated specifications, but one could argue it's a more typical use-case than a full power test.
Amir's tests closely align with the Hypex data, although I just wish a "line-in-the-sand" %THD figure was used for ASR tests going forward. I use 0.1%, Hypex uses 1%, Amir uses the "knee" which could be essentially anything and varies from product to product. If one was to pick 1%, even "designer" tube gear would make it, without needing special concessions...
As a Hypex Class D implementation, nobody can deny the clean and simple look of the product without looking like a DIY project. It appeals to me, although I'd just buy a couple of his mono-blocks and call it done if I was starting out.
Amir's tests closely align with the Hypex data, although I just wish a "line-in-the-sand" %THD figure was used for ASR tests going forward. I use 0.1%, Hypex uses 1%, Amir uses the "knee" which could be essentially anything and varies from product to product. If one was to pick 1%, even "designer" tube gear would make it, without needing special concessions...
As a Hypex Class D implementation, nobody can deny the clean and simple look of the product without looking like a DIY project. It appeals to me, although I'd just buy a couple of his mono-blocks and call it done if I was starting out.
restorer-john
Grand Contributor
5W is Amir's standard low power test. Typically it was 1W, but let's face it, speakers are pretty inefficient these days and most listening is done with levels hovering around 5W/4R, even I admit that is true.
His high power resistors can do upwards of half a kilowatt.
5W is Amir's standard low power test. Typically it was 1W, but let's face it, speakers are pretty inefficient these days and most listening is done with levels hovering around 5W/4R, even I admit that is true.
His high power resistors can do upwards of half a kilowatt.
Oh, I agree with you, 5W is sufficient for normal listening, I was just curious if his resistor can withstand full power load.
I guess you meant 252MP. You already have your answer here:
https://www.audiosciencereview.com/...d-measurements-of-iom-ncore-pro-pwr-amp.8979/
I tend to agree. (No offense, Alan
). For EU customers, Audiophonics NC122MP or NC252MP amps are more competitive (if we don't consider build and finish).
There are many reasons people choose a particular product. Price is rarely the defining reason.I guess you meant 252MP. You already have your answer here:
https://www.audiosciencereview.com/...d-measurements-of-iom-ncore-pro-pwr-amp.8979/
I tend to agree. (No offense, Alan
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He is not using a 5 watt resistor, he is testing at 5 watts output as this is a very typical listening level. His dummy loads can take over 500 watts as he has tested other amps at this level.
Our P252 performs better.
Yup, I got that from @restorer-john post.
Btw, from what I can see from this measurements you built a decent amp. Regarding max power related comments, here are my 2c: some folks would find this power sufficient and for those who want/need more I'm sure you have other models to offer.
So, let's make things right..
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True, if you have very sensitive speakers this is probably enough.
And shipping costs from the land of Oz to Europa...
Do Commonwealth nations, e.g. Oz to UK, get a break on import duties via "free trade" agreements?
What VAT taxes do EU and non-EU European countries pay on imports? How does that mesh with import duties?
Headroom is relative based on an audio system. I was happy with 25wpc for my mid-sized Paradigm Atom monitors...
...but now have 70wpc, which gives me more "headroom" for musical peaks with music that has good dynamic range. The March P 122 would give me more headroom, although I doubt I would notice it.
Being familiar with Alan's Background (LINK), which includes working for many years at the turbine (jet engine) division of Rolls Royce, I would expect the cases, components and assembly of March amplifiers to be of very high quality.
We had a thread a while back where we discussed this and IIRC I also suggested a lower THD limit for power ratings, but the consensus seemed to disagree and favour a higher limit.
I agree we need a consistent limit, whatever that may be, and not just eyeball the knee point.
Different people's requirements do vary quite a lot. It does depend upon speakers, application; size of room, listening style etc. Even 75 watts (8 ohms rating) into typical 85dB/w/m speakers can generate decent sound levels, circa 103dB
I agree as well. Attached plot shows transition area in higher X-axis resolution. I would not use the "knee" point, but rather the 1% point, then even tube amps or similar to Pass amps might be defined in power rating. 0.1% point might be acceptable as well, but then amps with very low FB or tube amps would be specified to low and contrary to their use in real world.
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