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Measurements

post #1 of 4
Thread Starter 
First, I have been involved with the loud side of hi-fi for a long time....well over 30 years. My last headphones were Koss Pro4aa of the original issue.
I continue to own a pretty good system which remains static for years at a time since I simply can't afford new stuff all the time. I am using my 2nd pair of speakers, about 3 years old, after I sold my original panels of over 25 years were sold.

Anyway, many people are concerned with sensitivity, impedance, SPL and overall frequency response.
I haven't seen any mention of phase angle. Is this an issue with phones? A large phase angle will suck the power out of an amp. With stereo speakers, a difficult load is one with both a low impedance dip and a high phase angle at near-same frequencies.

Is there any similar data for headphones? Does anyone measure phase angle? Are dummy loads for amplifiers pure resistive loading or do they have reactive elements?
post #2 of 4
I haven't answered your question in my thread yet, but yes, a good impulse response measurement is something we should have a good hard look at. Both from the perspective of how the amp responds to a heavily reactive load, and as it relates to headphone performance with varying output impedance of the amp.
post #3 of 4
If 'phones have a mainly flat impedance plot then phase is not an issue. If the impedance fluctuates with frequency then phase may be a limited issue. I say limited because even as a worse case in headphone terms it's nothing like that of loudspeakers, and it's only likely to draw a few more mA. If the amp is competent it should not be a problem. So I guess the challenge becomes finding a competent amp?!?!
post #4 of 4
This thread must be cursed or something. 3rd try to post a response, here we go!

Most headphones have an impedance > 32 Ohm, no impedance dips like speakers (only a peak at f0 and often increasing imp. towards 20 kHz) and are fairly efficient.
And there's only a single speaker per ear - a nice simplification if you think about speakers and effects like cancellation.
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