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Specifically, this is an observation and question regarding Harman/Kardon's usage of four internal capacitors vs., for example an Onkyo's two capacitors.


First of all, do Harman/Kardon's use all four capacitors when in stereo mode? The older Harman/Kardon AVR 247 has 2x10,000uf and 2x8,200uf capacitors. Do they combine in stereo?


Second, does the total capacitance of the lowly AVR 247 (of 36,400uf) mean that it is somehow in someway "just as powerful" in stereo then say an Onkyo TX-NR3007, which has 2x18,000uf for a total of 36,000uf?


I appologise if this offends anyone's intelligence somehow. I'm a complete newbie to this kind of stuff. Just trying to learn.



PS: Im sure there's alot more to this, such as amplifier class, the size of the transformer, and the voltage ratings of the capacitors themselves?


Anyway, thanks in advance for any response.
 

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Receivers, whether they are two channel or 7.1, use a shared power supply.


All amps in receiver using class AB topology need a positive and negative power supply voltage. Each of these two power supply voltages uses one or more filter capacitors to smooth out the voltage coming from the bridge rectifier.


A designer might use multiple smaller capacitors rather than one big one in such as way that a smaller voltage capacitor could be used than is dictated. Various series-parallel combinations are possible to increase filter capacitance.


Up to a point, using more capacitance can reduce power supply ripple. There's a law of diminishing returns. Using more filter capacitance can also result in an increase in very short term power as the filter capacitance can also store energy.


For more info on how amp power supplies work google 'amplifier power supply.' There's some interesting articles online.
 
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