No, that isn't an impedance issue, and I would also not expect there to be an impedance issue in this particular case. It sounds like the problem is that the combination of gains, sensitivities, and source output level(s) in your system is simply too high. And as with many volume controls, at low settings such as 8 and 9 o'clock a small amount of change in the setting is apparently designed to produce a considerably larger change in volume than the same amount of rotation would produce at higher settings.
What are the rest of the components in the system?
Regards,
-- Al
What are the rest of the components in the system?
Regards,
-- Al