For those who don't have the patience to read the whole paper, the relevant part is "So, what does the FTC Amplifier Rule tell us? 1. Power output is to be expressed as “average continuous power in watts.“"
Power at 1% THD isn't equal to peak power. Peak power will be far beyond the 1% THD spec. Some rate their amps based on peak power, or "burst power"
Look at the Soulution 501. rated at 125w continuous, yet impulse power is 5000w
http://www.soulution-audio.com/en/serie5/501/index.php
Look at the Soulution 501. rated at 125w continuous, yet impulse power is 5000w
http://www.soulution-audio.com/en/serie5/501/index.php
Class A and A/B amps behave very differently from class D in that respect, you can't draw conclusions from one about the other.
So you're saying the 1% THD rating of the Hypex amps is absolute max? Femto second burst rating?
If you go by femto second burst ratings, I can understand why your power ratings are so high.
Well, actually not - a femto second pulse would require response up to petahertz frequencies, and amps are usually not designed to to reproduce ultraviolet light.
Thanks for the link.
Hypex does not specify power in watt RMS, at least not in the NC500 datasheet.
To repeat, the continuous output power of NC500 is 100 W, "typically, this is 1/5 of the peak output power. Apply sufficient cooling." (to quote Hypex)
The Audio Precision paper mentions RMS output power being a misnomer.
Bavmike's romantic 700 W is the 4 ohm peak power.
As you can see in the distortion plots, at max output the distortion goes almost vertically. I mentioned before that the diffrence in Pr at 1% is 0.01% is almost nil, basically a few Watts, nothing to worry about..
As I said, all numbers are Watt rms. It indeed does not state the time duration except in the continues output specification is W(rms), namely continues. The Peak Output Power is also in W(rms). Peak Output Power is a 1kHz sinewave. If 500W is stated, it means a sinewave with 500*Root(2)= 707 Wpeak.
Bottom line, I consider the NC500 a 200W amplifier (at which distortion stays under 0.005%) but it is not capable of continuous operation at that rated level. (The amp I just built is capable of 200W@8R or 400W@4R continuously with similar distortion levels.) I would derate the SNR for the lower output rating as well.
I wouldn't pay a dime for anything from 6Moons...although that's not to say an NC500 implementation isn't a good amplifier.
Colin, I hope business is good.
I wouldn't pay a dime for anything from 6Moons...although that's not to say an NC500 implementation isn't a good amplifier.
Colin, I hope business is good.
Give them a call and have a yabber. They only make Hypex-based amps using NC1200 modules for which their specs are more informative than most (each power rating stating the relevant THD threshold - something Colin ought to note):
Power Output
8 Ohms: 250W RMS (24 dBW) with less than 0.01% THD from 20 Hz to 20 kHz; 300W RMS (24.77 dBW) with less than 1.0% THD from 20 Hz to 20 kHz; 350W RMS (25.44 dBW) with less than 1.0% THD, 1 kHz; 395W RMS (25.97 dBW) with less than 1% THD, 1 kHz, Burst Mode
4 Ohms: 500W RMS (27 dBW) with less than 0.01% THD from 20 Hz to 20 kHz; 700W RMS (28.45 dBW) with less than 1.0% THD from 20 Hz to 20 kHz; 800W RMS (29 dBW) with less than 1% THD, 1 kHz, Burst Mode
2 Ohms: 850W RMS (29.24 dBW) with less than 0.01% THD from 20 Hz to 20 kHz; 950W RMS (29.78 dBW) with less than 1.0% THD from 20 Hz to 20 kHz.
Power Output
8 Ohms: 250W RMS (24 dBW) with less than 0.01% THD from 20 Hz to 20 kHz; 300W RMS (24.77 dBW) with less than 1.0% THD from 20 Hz to 20 kHz; 350W RMS (25.44 dBW) with less than 1.0% THD, 1 kHz; 395W RMS (25.97 dBW) with less than 1% THD, 1 kHz, Burst Mode
4 Ohms: 500W RMS (27 dBW) with less than 0.01% THD from 20 Hz to 20 kHz; 700W RMS (28.45 dBW) with less than 1.0% THD from 20 Hz to 20 kHz; 800W RMS (29 dBW) with less than 1% THD, 1 kHz, Burst Mode
2 Ohms: 850W RMS (29.24 dBW) with less than 0.01% THD from 20 Hz to 20 kHz; 950W RMS (29.78 dBW) with less than 1.0% THD from 20 Hz to 20 kHz.
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