Too loud ? Too soft ? The PRE-GAIN method The V281 is specially designed to drive headphones. Headphones however can present load impedances from 8 to 2000 ohms and efficiency ratios from 85 to 115dB per milliwatt. Thus it can be quite tricky to fulfil all demands, since... … owners of high-efficiency headphones will rarely set the volume control higher than 9 o'clock in order to exclude hearing damage, while ... the maximum setting may still be too soft for low-efficiency headphones, but … all users expect highest quality at lowest noise and distortion. Thus, the circuitry must adapt itself as the headphone won't !
WE CALL THE SOLUTION TO THIS PROBLEM PRE-GAIN
The alignment between amplifier and headphone is provided by the preamp stage, which can boost or attenuate the input signal in four steps of 6dB each. For this purpose, two switching devices are located on the rear panel for left and right channel individually.
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