sarathcpt
100+ Head-Fier
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Power transfer theorem and impedance matching is valid for any electrical circuit which is terminated in a load. The load could be anything which draws power from the source even another amplifier. Agreed reflection losses are not significant here..but there could be thermal power dissipation in the source.
Here is a more detailed account :
Maximum power theorem - Wikipedia, the free encyclopedia
Quote:
Here is a more detailed account :
Maximum power theorem - Wikipedia, the free encyclopedia
Quote:
Originally Posted by Koyaan I. Sqatsi /img/forum/go_quote.gif Dude, we're talking about headphones here, not transmission lines. The most efficient transfer of power over a transmission line occurs when the source and load impedances are matched because then you're not losing power due to reflection losses. Reflection losses are only an issue when the length of the line is on the order of the electrical wavelengths of the signal you're sending down the line. But again, we're talking about headphones here. The shortest electrical wavelengths at audio frequencies are MILES long! Transmission line theory just doesn't apply in this situation and invoking it only serves to cause more confusion and erroneous assumptions. se |