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.
CAUTION !! The switch settings should be altered under the following conditions only: - The unit must be switched OFF - the "VOLUME" control must be set to minimum - left and right channel settings should ALWAYS be set the same - never increase the setting by more than ONE switch per channel
If you find your HPA V281's volume could be somewhat softer (in order to improve volume control range e.g.), push the switch labelled "-6 dB" (half gain) or "-12 dB" (quarter gain) in upward direction. If you find your HPA V281 should provide more gain, do so with the switch labelled "+6 dB" (double gain) or "+12 dB" (quadruple gain).
Ex-factory, all switches are set to their lowest position - i.e. 0 dB or unity gain - which should be sufficient for most applications.
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