I drive my x250.5 with Wilson Sophia 2 (89db 4ohm ) meter starts moving around -35db-45db(boulder pre.). However, I can make critic listening just a bit below -50db. That is ,I think, near limits of Class A operation. I didn't sense of any signal of congestion from either speaker and amplifier side.
Keep in mind Wilson Sophia2's impedence drops 3.26 ohm and Pass x-250.5 will not drop more than 4 ohm.
Keep in mind Wilson Sophia2's impedence drops 3.26 ohm and Pass x-250.5 will not drop more than 4 ohm.