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Old 25-10-14, 05:09 AM
Eniac The First Eniac The First is offline
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Join Date: Oct 2014
Posts: 13
Use the 1/8 rule of impedance for the best sound quality.

Most headphones work best when the output impedance is less than 1/8th the headphone impedance. So, for example, with 32 ohm Grados the output impedance can be, at most, 32/8 = 4 ohms. The Etymotic HF5s are 16 ohms so the max output impedance is 16/8 = 2 ohms. If you want to be assured a source will work well with just about any headphone, simply make sure the output impedance is under 2 ohms.
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