Balanced, stereo audio requires at least five wires (excluding shielding): +L, -L, +R, -R, and ground. Thus, an unbalanced stereo audio signal requires only three wires: +L, +R, and ground.īalanced audio contains an extra inverting signal for each channel. Unbalanced audio consists of a signal conductor and a ground conductor. What are Balanced and Unbalanced Connections? Headphones and most headphone amplifiers are designed for unbalanced connections. Audio interfaces are built to accept balanced inputs and outputs. A headphone amplifier is the answer.Īlas, mating pro audio gear with typical headphone amplifiers is less than straightforward. Volume on the interface can be turned to 100% without threatening my ears. I recently tried a set of Sennheiser HD-650s using the headphone output of a Focusrite Scarlett 2i2 interface and completely agree. We often hear from musicians and recording engineers who need to boost listening volume of their headphones.
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