The Sennheiser HZR headphone balance adjustment is what you need if you're bothered by problems with an unbalanced (left-right) audio source and you're listening with a device that doesn't incorporate a balance control (I'm surprised at how common a problem this is).The Sennheiser unit isn't cheap (about thirty dollars) but it's well built and it does the job.
The unit is purely passive and it functions by virtue of being composed of two ('left' and 'right') 'slide' type potentiometers in the signal path. When at 'maximum' the controls appear as resistances across the left and right audio paths but at too high a resistance to be any kind of a problem.
As the 'sliders' are brought down (to reduce the volume of either the left or right channels) the output (towards the headphones) is brought nearer the ground side of the audio channels in a Voltage-divider type configuration.
As long as you've got more than enough volume to drive your headphones then this Sennheiser unit will give you essentially infinite adjustment range over the relative volumes of the left and right channels.
I've found the device sufficiently convenient such that I've recently purchased a second unit (because the first one is being employed in a relatively long-term application).
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Product Description:
Volume Control/Extion Cable
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