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How to split headphones from dcommand12/8/2023 ![]() ![]() There are enough headphone amps that measure and sound great loaded with a high impedance (300 ohms or more) but measure and sound flat out ugly when loaded with 32 ohms that this is worth taking into account if you want to run 32 ohm headphones off of whatever it is you are testing. If you are testing a headphone/power amp this way be sure to load the output between the output of the "amp under test" and the "distribution amp(s)" with a realistic load. ![]() At least everyone is listening to the same amplification chain. They are generally kind of cheap, but if you are trying to get a consensus of how a certain change to the circuit sounds from a bunch of people at once it may work. 1 input, and several headphone amps built in, each with its own volume control (before the amp) and every headphone gets its own actual amp. You can buy fairly inexpensive amplifiers designed for studio use like this. As long as you keep the variables to a minimum and the splitter amp is good enough to get the differences through you should be reasonably OK. Or is it prefered to have one input & amp each output seperately? but drawback if one wanted to use it for testing out another amp so everyone could listen to it, then you would be amping the signal twice and not directly listening to the source amp.Īmplifying the signal twice is as you mentioned not ideal, but it may be the only way to get a consensus from a group. Depending on the headphones it could be harmless or it could be pretty important. The problem with putting a volume control on the output of the amp is that the output impedance of the amp is conditional on where the pot is parked and generally quite high no mater what you do. The headphones are in parallel, so a few sets of low impedance headphones may be too low of an impedance for the amp to drive well. If everyone has the same headphones this works out OK assuming everyone likes the same levels and the amp can drive the combined load properly. From that point on do you split the amps output and put potentiometers to each audio output? so that each device can get the correct drive? I assume if one attempted this method you need a powerful amp turned up high? I was curious on how to split music with one music source, and amp to 2-3 headphones. I was curious how audio splitters work, but im not exactly talking about Y-cables. +/-0.165ohms) What this did was ensured that the load seen by the driving device (amplifier, phone, etc.) was constant at all points in the circuit variations in the impedance of individual headsets became a non-event.Originally Posted by igotyofire /img/forum/go_quote.gif All resistors were matched to within 0.5% (i.e. the left and right channels for each socket but not the ground line for what is hoped are obvious reasons). Decades ago now (1987) I built a few variations on a splitter box based on circuits published in various audio magazines and audio textbooks - the best one had each socket loaded with a 33ohm resistor on each leg containing audio (i.e. expected with a tolerance of +/-5% usually. Even the same make and model of headphones can have variations in their specifications - all specifications are nominal i.e. This is because different makes of headphones have different impedances which the output device (phone, amplifier, etc.) sees as a variable load and so ends up providing variable output power which one moment can be too much and the next not enough to drive the different headphones. Unfortunately this project suffers from a basic flaw - the implementation means that any set of headphones can load the other set(s) and therefore introduce distortion to all sets. It's always a good idea to check in order to make sure there are no shorts and no broken contacts. Once you have identified the contacts on the male side, plug it into one of your female jacks and measure the resistance between the known wires and the contacts on the female jack. Otherwise, you already have your ground and two sides. The front is left, and the middle is right. If you care about left and right, check the resistance from the remaining wires to the jack. You can identify the ground either by measuring the resistance between each wire and the end of the jack, or by finding the pair of wires that have no resistance between them. Often the two ground wires are the same color, and the left and right are two more colors. You will have four wires, two ground, the left, and the right. Strip some of the insulation off the ends of both wires attached to the male jack. I'm sure there's some sort of industry standard here, but I didn't bother to check. ![]()
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