I have not listened to either but I do own Pass Labs and Luxman and I think I know their general sonic "flavor". Here's what I would anticipate. The Pass will offer more "apparent" transparency, be more open sounding, with better defined bass. The Lux will be more immersive and dense with a well saturated sound field bordering on the "liquid". Suffice to say, I suspect they will sound very different and it comes down to your personal preference and "system matching". You can audition the Lux at Music Direct and the Pass at Reno Hifi. Both offer money back guarantees. Good luck.