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Need help calculating power output for headphone circuit...


(I've also posted this over in the Propeller Head Forum - apologies for the duplication)

Not sure if here is the correct venue, but here goes:

I own a Luxman SQ-N100 tube integrated that I purchased to anchor my office system. Rumor has it that it is also an exceptional headphone amp. In order to make some informed headphone choices, I'm trying to understand what the power output would be for headphones of different ohm ratings.

Given the info I've included below, is it possible to calculate headphone power output? ...say for 20, 36, 46, 62, 80, 100, 300 and 600 ohms? I realize that sensitivity comes into play, too, but those ratings are usually available in published specs.

If there is general formula I can apply, I'm happy to do the math. Thanks!

This is a quote from the review whose link I have included if you are interested - it describes the headphone circuit:

"Headfi fanciers will be excited to learn that their ΒΌ" socket taps directly into the SQ-N100's main valve output stage. For ear speaker purposes, the output voltage simply couples through a pair of 470-ohm load resistors to attenuate its strength."

These are the Luxman specs:

Rated output: 12W + 12W (6Ω), 10W + 10W (8Ω, 4Ω)
Input sensitivity: LINE: 150mV, PHONO (MM): 2.2mV
Input impedance 47KΩ
Frequency response 20Hz - 50KHz (within -3 dB)
Total harmonic distortion 0.3% or less (1 kHz rated output)
S/N ratio 90dB or more
Input LINE: 3, PHONO (MM): 1
Output SPEAKERS: 1
Functions Remote control applied (sound volume), head phone output
Tone control (bypass enabled), AC inlet
AC outlet X 2 (non-interactive, total 200W max.)
Circuiting system Mullard type UL connections
Vacuum tubes used ECC83 X 1, ECC82 X 2, EL84 X 4
Power consumption 95 W (Electrical Appliance and Material Safety Law),
71 W (no signal)
Power supply AC 100V (50/60Hz)
Accessories Remote controller, power cable
Dimensions 297W X 162H X 210 (258) D mm
(I/O terminals in brackets, including operating knobs)
Weight 11.5kg

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Topic - Need help calculating power output for headphone circuit... - soulbrass 07:20:49 06/07/17 (10)


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