Melbguy1,
The newer XP series preamps from Pass are better than the older X series. I had the X-1 and the now the XP-20 and the later is much better, though more expensive. Pass believes that the XP-10, a one-box unit is sonically superior to their former reference three-box X0.2. For less than $4K, I would look for a used XP-10. But I'm not sure I would mix Pass with Spectral. Why not at least listen to the Spectral preamp?
The newer XP series preamps from Pass are better than the older X series. I had the X-1 and the now the XP-20 and the later is much better, though more expensive. Pass believes that the XP-10, a one-box unit is sonically superior to their former reference three-box X0.2. For less than $4K, I would look for a used XP-10. But I'm not sure I would mix Pass with Spectral. Why not at least listen to the Spectral preamp?