![]() ![]() I guess the first thing to discuss is the meaning of balanced and unbalanced, since it's more a technical issue between experts and has far less real meaning to consumers. The H4n is a great device, if pricey (but not overly priced.) Balanced and unbalanced/single-ended Not really, it defines voltage ranges and impedances for each interface. It's just how it is used in audio gear and why. It may not about understanding impedance itself. Few decades ago, things were different, and equipment might have had say 600 ohm input and output impedances.īut at present, you don't need and don't even want to match the impedances. That's why impedance matching is not used in modern analog audio interfaces. ![]() If you match the impedances, you maximize received power at the input, but you lose half of the voltage. Therefore you generally want as low output impedance as you can get, and as high as input impedance you can get, so that an input sees the maximum voltage the output can provide. Modern audio equipment and interfaces use voltage as the means of audio signal transfer. ![]() The discrepancy is important and you need it.So an headphone output connected to line or mic input may not sound so good because they don't have compatible impedances and voltage levels.įrankly, connecting a headphone output to line input makes no sense, since the headphone amp has a line level monitor output for that purpose. That may come as a surprise, but all those different interfaces, such as headphone connector, line level connectors, and mic connectors need to have their own parameters such as voltage ranges and impedances to best work with the thing it is connected to. (I'll note that the more mathematical details any response includes, the better.) Perhaps someone could tell me which of the three conclusions listed above best describes what is going on here, or, perhaps, there are more conclusions that I-certainly a novice in this area-am overlooking. The H4n manual contains typos and/or "imprecise" language.I don't understand impedance well enough.This "discrepancy" of impedance is not actually all that important.This leads me to one of the following three (not necessarily mutually exclusive) conclusions: Given the stated input impedance of 480 kOhms, this sounds to me like a "Hi-Z" input but these are also described as "phone" jacks in the manual. I'll note that the manual for the H4n also states that the 0.25-inch "phone" inputs can be used for "instruments (e.g., electric guitar, keyboards) or line level sources". So, if I am understanding this correctly, it seems to me that these impedances are "mismatched" by a factor of 1000 (which seems strange.) However, the "Headphone Impedance Working Range" for the HP4 is listed as 32 Ohms to 600 Ohms whereas the "Input impedance" for the (unbalanced) 0.25-inch "phone" inputs on the H4n is listed as 480 kOhms. My thought was to simply use a 0.25-inch male stereo TRS (connected to one of the HP4 headphone outputs) to dual 0.25-inch male TS (connected to the two H4n "phone" jacks) "breakout" cable. ![]() I would like to send an audio signal from a Presonus HP4 headphone amplifier to a Zoom H4n "handy" recorder, but I am having difficulty understanding the role of impedance in this setting. ![]()
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