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Cheap/generic PSUs - any good? (was: Low power socket A)
On Thu, 23 Sep 2004 17:11:22 -0500, David Maynard
wrote: Terran Melconian wrote: .... ... I expect that the power ratings for the individual voltage outputs were spec'ed in the same dishonest way that hifi manufacturers used to rate power amps (still do, in fact). Each *individual* output would supply the specified current or wattage; but load them all up at the same time and POW! Well, an audio amp shouldn't 'pow'. What should happen with a single channel power spec is you run into distortion before you reach what you 'think', from the channel spec, is max power output. (spec'ing single channel power is done to cover the power supply's inability to provide that much power to both channels simultaneously. Voltage output droops and causes distortion) Amp manufacturers used to spec their output power one channel at a time, for a *very* short time (even down to milliseconds). They could 'honestly' state an inflated value, but real-world ratings were considerably less. Well, I don't think whether it's both channels driven or the bogus 'peak music power' really fall into the same category. A single channel spec does have some sense to it. 'Peak Music Power' doesn't. But, for a completely 'honest' number one should be looking to continuous RMS output, both channels driven. I seem to remember there was a "peak music power" test or some such thing where they did actually run a power amp circuit for some fraction of a second before it vaporized and claimed the measured output as the spec of the amp. After that nonsense, they got into honest specs for awhile. RMS output measured with both channels driven into 8 ohms, across 20hz-20khz bandwidth. Then all that went away and all you see now is these silly X.1 channel entertainment boxes. Personally, I like to spin the amp around and read the UL wattage label on the back of the unit. 100watts per channel 5.1 with a 230watt UL sticker |
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