Surprised you'd think you need more headroom over what the Pass 250.8 can deliver. It puts out 250 watts per channel into an 8 ohm load, which doubles to 500 watts per channel into 4 ohms. In stereo, the Luxman m900u by comparison delivers 300Wpc into 4 ohms continuously, although dipping down into 2 ohms the Luxman likely delivers more power than the Pass - but is that really helpful?