The Pass X-150 has an input impedance of 22K in balanced mode only. If you are running singled-ended, it is half that amount. But you are still okay.
As I type this, I am listening to a Pass 150 with a preamp that has an output impedance of 1700 ohms. Sub-optimal on paper, but it is sounding very good.
As I type this, I am listening to a Pass 150 with a preamp that has an output impedance of 1700 ohms. Sub-optimal on paper, but it is sounding very good.