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RE: Need help computing power ratings for headphone circuit...


from the specs we can deduce that it can produce an output voltage of at least 9Vrms (10W into 8Ohms) using V= SQRT(P * R). When driving low impedance headphones (20 Ohms) that voltage will generate 4W. When driving high impedance headphones (300 Ohms) that voltage swing will generate 0.270W. There will be no current limitation because the Luxman can drive 10W into 4 Ohms.
Whether these powers are enough to drive headphones loud depends on their sensitivity. A look online suggests that HD600 (300 Ohms) have 97dB/mW sensitivity and need 63mW to reach 115dB SPL so the Luxman has capacity to deafen you with those headphones. Another quicklook at the Audeze website suggests 1 -4W to drive LCD3s (110 Ohms). The Luxman would give you 0.7W.

I am assuming that the headphone jack is connected directly to the speaker outputs and there is no series resistor.


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