I'm a little bamboozled over amps with multiple gain settings as described to accomodate a wider variety of headphones.
I googled and read a "gain" article and from that understand high gain increases the amps input sensitivity (decreasing voltage reqd to achieve full rated power) therefore creating a danger of clipping if the source is delivering more voltage than what the corresponding gain setting has done to the input sensitivity voltage.
Conversely, a low gain setting will decrease the sensitivity (increasing the voltage necessary to achieve full rated power) and you might never get the amp to deliver full power.
Is this the same thing as the multiple gain settings on portable headphone amps? I'm getting confused because all the disscussion seems to be on the amp output and how it relates to driving the load vs. how incoming voltage can effect amplifier performance (and thus output load)
Let's say we have a DAC that can output 2.0V and two headphones with equal sensitivity, Headphone A has a flat 40 ohm load and B has a 600 ohm load. Would the A work best with low gain and B with high? Lower impedance wants more current, higher impedance wants more voltage....right?
I'm losing it trying to get my head around this