With headphone amps it is the opposite , there is little effect with damping.
Not sure if I follow your question exactly - but if it's why BAs seem to be more sensitive to impedance, I believe it's largely because of the crossovers in the circuit.
I did a bit of searching for something that went into it without getting too technical, I believe nikongod is a pretty respected head-fier on amp building and such:
Bellbottom blue face plate and clear shell
So silly question... I've become quite attached to having a right angle jack w/ my aftermarket cable for my TG!334.
Any chance of getting that as an option? I only saw options for cable length.