Choosing Closed Headphones w/ Mic - Audio Technica ATH-AG1 and Sennheiser G4ME Zero
Would you suggest then to just get the headphones on their own first and then get an amp later if I'm not satisfied? I see sensitivity being measured in different units by different people so it's a little confusing
Also, I understand that the point of a (good) amp can also be to eliminate some of the static you can get at high noise levels from some poorer quality onboard amps. I.e. you'd set the onboard amp to a low volume (without static) and then use the good external amp to push up the volume (this is assuming that it's just an amp, not an amp/dac combo).
Finally, if sensitivity is what determines whether or not you need an amp - what do the impedance values reflect? I know they basically mean how much resistance the drivers in the headphones create, but what effect does it have on your setup requirements and listening experience?
Yes, that is almost always the best strategy, unless you know that your onboard is faulty to start with. As you say, onboard audio may suffer from static, but this is usually caused by emi from other components in the system. A separate amp/dac will be isolated and so not have static.
Impedance is getting into more advanced concepts. Headphone amplifiers have their own "output impedance" and general advice is that a headphone's impedance should be at least 8x the output impedance of the amp. If it isn't, there may be distortion.
Impedance also relates to drivability in that amplifiers put out different amounts of power depending on the impedance of the headphone. So you need to know both the sensitivity AND impedance to determine how hard a phone is to drive. Or the simple way, getting back to the first point, is to just plug them in and see if they are loud enough.
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