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RE: Are my ears really that sensitive?

Your observations are all in line with my own and those of others who have listened to the "sound of components". Ribbons are all too revealing of the differences between various components. If you still hear end of record distortion then you probably would notice all you described as well.

As to the proportions with the damping resistor, you have a up 50% down 30% adjustment and a subsequent up 6db difference in relative levels (no resistor vs 1 ohm ) and a change of XO freq from say 2khz to 3khz, and move of tweeter phase at 2khz by something like 20 some deg.. So discerning a difference between 0.4 and 0.6 ohm resistors is not at all outlandish as the difference in overall impedance is 10%.

***The other thing to remember in changing your tweeter's damping resistor is that it changes not only the level at the tweeter but also at the other drivers - since it is not buffered, so you have a double impact - lowering impedance brings more current to your tweeter and less to the others.*** Besides this you are changing the phase significantly and changing the corner frequency for the tweeter high pass, raising the defacto HP freq as you lower impedance. This can have the added impact lower down in freq where the upper mids have less of an overlap with the tweeter.

Item in bracketed in *** is incorrect in this case since the other legs in the XO are isolated by reactive components. This mind fart is because of my 2 level adjustments in the PLLXO and their interaction with each other and the filter loads - something I need to keep in mind every day as I need to tune bass to the recording at least once every listening session.


Edits: 09/10/14
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