Dave_72..there should be no problem pairing the Onkyo to the Pass amp which has a low input impedance of 20 Kohms.
Onkyo pairs their M5000R amp with the P-3000R Preamp. The M5000R has a lower input impedance of only 10 Kohms and works well with the P-3000R which has an output impedance of 330 ohms. No problem.
Onkyo pairs their M5000R amp with the P-3000R Preamp. The M5000R has a lower input impedance of only 10 Kohms and works well with the P-3000R which has an output impedance of 330 ohms. No problem.