Originally Posted by surfer1000
I'd like to know exactly what the gain switch does as well, all it seems to do here is alter the loudness of the player
Im sure it something more technical to do with the ohm of the amp, but how do we find out exactly what lo mid hi change so we can match to our headphones correctly ?
The function of the gain switch is to adjust the voltage feedback to the DX100 amplifier in order to avoid being over-driven by the input voltage. Input levels can vary greatly due to differing recording levels, use of EQ, etc. With a fixed gain, high-level transients or inputs recorded at high levels plus EQ boost (especially bass) could easily overdrive the amplfier section, resulting in clipping and/or distortion even at volume settings much less than maximum.
The ideal gain setting will allow the amplifier to deliver its full rated power at the maximum setting of the volume control into a specific load while meeting its specified distortion values and still maintain some amount of headroom for high-level transients.
Generally speaking, the gain should be set at the lowest setting that will provide the desired volume without distortion or clipping. This will also provide the most headroom for the amplifier section. Changing the load (such as the use of headphones of differing impedance and/or sensitivity) also changes how easily the amplifier section can be over-driven. Very low impedance phones will result in the amplifier reaching its rated output with a much lower imput voltage.
While there are various methods of gain control, the bottom line is that the gain control simply matches the maximum output of the amplifier when driving a specific load to the voltage level of the source input.Edited by HiFlight - 7/6/12 at 8:37am