The ratio impedance between the series ldr to the shunt ldr is what causes the level difference, this is why it's called a voltage divider, but one that can be varied in both planes. EG: If they are at the same impedance you have half volume coming through from the source.
As for the 2v or 4v choice, it depends on the poweramps gain and speakers efficiency, go with the one that gives you good reasonably loud listening level at mid position, but it doesn't really matter too much. With one of my very low gain amps I listen around at 3 o'clock with the others around 10 o'clock and you'll never guess which one has more dynamic headroom, yes the one that's at 3 o'clock the low gain amp, not because of the Lightspeed but because the amp has itself has less restrictive (compressive) circuitry.
It does not matter where the volume is for listening, so long as all the i/o impedances are right, and you can reach your loudest level you want to hear.
There is no such thing as dynamic headroom compression with the Lightspeed Attenuator volume control as it can pass anything the source gives out, unhindered. The only thing that will sound artifically dynamically better is a DBX unit (dynamic range enhancer) but we all (old school audiophiles ) know how disgusting they make the music sound.
Cheers George
As for the 2v or 4v choice, it depends on the poweramps gain and speakers efficiency, go with the one that gives you good reasonably loud listening level at mid position, but it doesn't really matter too much. With one of my very low gain amps I listen around at 3 o'clock with the others around 10 o'clock and you'll never guess which one has more dynamic headroom, yes the one that's at 3 o'clock the low gain amp, not because of the Lightspeed but because the amp has itself has less restrictive (compressive) circuitry.
It does not matter where the volume is for listening, so long as all the i/o impedances are right, and you can reach your loudest level you want to hear.
There is no such thing as dynamic headroom compression with the Lightspeed Attenuator volume control as it can pass anything the source gives out, unhindered. The only thing that will sound artifically dynamically better is a DBX unit (dynamic range enhancer) but we all (old school audiophiles ) know how disgusting they make the music sound.
Cheers George