The effective storage capacitance of the Hypex SMPS is more than 4700 uF, but it doesn't matter as much as with a linear design.
Probably, yes. I am OK with having 2 nc400's powered by one shared smps600 driving the Linn Isobariks in active mode - not an entirely easy load.
"Any", yes, but not sure it is very significant. Having separate SMPSs is more a benefit for continuous power.
A class D amp or SMPS (a class D amp is basically a SMPS that is controlled in real time by the input signal) basically trades current for voltage, and that is probably why Hypex doesn't specify the maximum current for the SMPS - it is just that the more current you require, the more the voltage drops, decreasing the available total power - so the only relevant parameter is the maximum output power, 650W.
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Define "adequately". For a short impulse, yes, no problem. For a longer-term signal, the voltage will fall, so total output power will be limited.
That is the long-term short-circuit protection kicking in. And remember that the nc400 is also a SMPS (but a signal-controlled one), so it also trades current for voltage. The 7 A short-circuit limit is at the SMPS output, and 7 A at a voltage of 2 x 65 V would be 910 W...
Again that is the difference with a switch-mode (class D) amp - output current is not limited by power supply current, like it is in a linear amp.
Many thanks for your quick and very detailled reply Julf!
If I read you correctly, it appears the SMPS600 should be able to deliver 14A for 3 Ohm loads, so 7A per channel in case of 2 x NC400.
Is that correct? (650W max, into 3 Ohm)
Interesting stuff the SMPS, I should read more on this regarding "energy storage and release", amazing. Any good link welcome...
Now, still based on your mail, 7A doesn't sound like a lot on impulse (well...), but you are also saying that the output current of Class D amps is not limited by their PS.
Do I stand correct if I say that the 2 x 24A short term delivery capability of the 2 x NC400 would still be intact with only 1 shared SMPS600, again considering only VERY short impulses and while of course not exceeding say 250W continuous power consumption on average (both amps together) in order not to sag the voltage "long term".
Many thanks again!
Claude
If I read you correctly, it appears the SMPS600 should be able to deliver 14A for 3 Ohm loads, so 7A per channel in case of 2 x NC400.
Is that correct? (650W max, into 3 Ohm)
Interesting stuff the SMPS, I should read more on this regarding "energy storage and release", amazing. Any good link welcome...
Now, still based on your mail, 7A doesn't sound like a lot on impulse (well...), but you are also saying that the output current of Class D amps is not limited by their PS.
Do I stand correct if I say that the 2 x 24A short term delivery capability of the 2 x NC400 would still be intact with only 1 shared SMPS600, again considering only VERY short impulses and while of course not exceeding say 250W continuous power consumption on average (both amps together) in order not to sag the voltage "long term".
Many thanks again!
Claude
It is actually irrelevant, as the load that the SMPS sees is not 3 ohm - even if the nc400 is driving a 3 ohm load, all the SMPS sees is pretty much the reflected inductance of the switching choke.
Will try to dig up something later.
Yes. And the impulse doesn't even need to be that short. Seems the SMPS output power drops by less than 10% (from 650 to 600 W) with a 20 Hz full-power signal (where the buffer capacitors run out of charge and the SMPS has to supply all the current).
Many thanks again Julf for your precise answers and also for the link - I will dig into that one!
Regarding:
It is actually irrelevant, as the load that the SMPS sees is not 3 ohm - even if the nc400 is driving a 3 ohm load, all the SMPS sees is pretty much the reflected inductance of the switching choke.
In fact I was trying to split things between SPMS and NC400 to understand how they work as stand alone units, not just in conjunction. In fact, I wanted to see how the SPMS600 would work as stand alone PS, say to supply a "conventional" amp.
It appears there are great synergies between SMPS and NC400 re power deliveries, the beauty of these technologies.
However, some use even the SMPS to drive class A/B amps, as a supposedly good PS, and then I have this doubt concerning the current supply: would in that case the SMPS be limited to 7A, or how would it react in front of a conventional amp re current delivery?
Many thanks again
Claude
Regarding:
It is actually irrelevant, as the load that the SMPS sees is not 3 ohm - even if the nc400 is driving a 3 ohm load, all the SMPS sees is pretty much the reflected inductance of the switching choke.
In fact I was trying to split things between SPMS and NC400 to understand how they work as stand alone units, not just in conjunction. In fact, I wanted to see how the SPMS600 would work as stand alone PS, say to supply a "conventional" amp.
It appears there are great synergies between SMPS and NC400 re power deliveries, the beauty of these technologies.
However, some use even the SMPS to drive class A/B amps, as a supposedly good PS, and then I have this doubt concerning the current supply: would in that case the SMPS be limited to 7A, or how would it react in front of a conventional amp re current delivery?
Many thanks again
Claude
OK!
Whereas I have heard of people who (probably driven by "SMPSs are bad" audiophile folklore) want to power their nc400's with a linear supply, this is the first time I hear anybody considering the though of the opposite - powering a linear amp with the SMPS600.
Yes, at some point the 7 A current limiting would kick in. I guess if you wanted to use the SMPS600 with a linear amp, you would need to use some large electrolytic capacitors to buffer the peak current.
Earth/Grounding
I just don't get it I have not read all 800 pages I am up to page 317 but in the prefered wiring of the data sheet for a balanced xlr input there is no earth wire to the IEC socket from the wall plug shown. Just the 2 mains wires to the amps and yet I have read loads of times where people have said connect a ground wire to the earth pin from the amps fixing. So what are you supposed to do earth the appliance or not.
I just don't get it I have not read all 800 pages I am up to page 317 but in the prefered wiring of the data sheet for a balanced xlr input there is no earth wire to the IEC socket from the wall plug shown. Just the 2 mains wires to the amps and yet I have read loads of times where people have said connect a ground wire to the earth pin from the amps fixing. So what are you supposed to do earth the appliance or not.
Many thanks Julf!
Yes, the First One amplifiers seems to use Hypex SMPS, for example... And would probably hit a limit re current if used with only one SMPS whereas the NC400 doesn't get limited in the same way re current.
Have a nice day!
Claude (reading your link, interesting!)
Yes, the First One amplifiers seems to use Hypex SMPS, for example... And would probably hit a limit re current if used with only one SMPS whereas the NC400 doesn't get limited in the same way re current.
Have a nice day!
Claude (reading your link, interesting!)
It depends. If you are confident that your wiring and enclosure is up to Class II safety standards, you can leave it un-earthed, but otherwise you should definitely connect safety earth to the chassis.
After a half day of listening to Bel Canto Ref600M, i can tell it is totally different beast from Nad M22. Definitely more to my taste than M22. Closer to nc400 as well, and I suspect it can sound even better.
hypex ncore
Let them run over night then do some comparisons. My units took a while to get to their best.
Let them run over night then do some comparisons. My units took a while to get to their best.
Input Voltage
Does anyone know what the voltage required is to drive the NC400 to maximum power I.e what is the input sensitivity and also the impedence
Does anyone know what the voltage required is to drive the NC400 to maximum power I.e what is the input sensitivity and also the impedence
My preamp Audiolab CDQ8200 gives an output of 2.0v is this going to work OK or will I have to change R141
hypex ncore
I know we had this conversation before a couple of years ago, but the 4.6v out from my Resonessence Mirus via the XLR's is a perfect match IMO.
When I was using a DAC before with 3V out, it wasn't enough.
With the Mirus playing from the built in SD Card transport, some tracks need turned up to 5-db to get to the listening levels I sometimes like to listen at. Especially DSD. If my speakers were less efficient, I would need even more.
With the other DAC, right to the max wasn't enough with some tracks.
Our argument started on post #5520 of this thread. We don't need to have it again.
I know we had this conversation before a couple of years ago, but the 4.6v out from my Resonessence Mirus via the XLR's is a perfect match IMO.
When I was using a DAC before with 3V out, it wasn't enough.
With the Mirus playing from the built in SD Card transport, some tracks need turned up to 5-db to get to the listening levels I sometimes like to listen at. Especially DSD. If my speakers were less efficient, I would need even more.
With the other DAC, right to the max wasn't enough with some tracks.
Our argument started on post #5520 of this thread. We don't need to have it again.
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I have absolutely no interest in having that discussion again, especially as we resolved it back then - you had no oscilloscope, and had not measured the actual level, and did not know if your source was actually putting out 100% modulation or not.
So for the benefit of colmo, here are the main points:
But in any case, the main point is, once again, that 2 V is enough to drive the nCore to full specified output power (at 1% THD), and anything beyond that is driving the amp into clipping.
Hi Julf, I'm using an Audiolab MDAC Dac/Pre into my nCore monoblocks via their balanced inputs/outputs, which the specifications say gives: "Output level @ 1khz 0db - 4.5v RMS +/- 0.1". Are you saying this is non-optimal? Or am I misunderstanding something?
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