I have the Pass X250 and do not find it mechanical at all. Sounds fluid to me. If I were you, I'd find a better way to make your selection, since you're spending quite a bit of money, and my opinion, like everyone elses, doesn't amount to anything, except what WE like. You'll have to find out what YOU like on your own. I can't make a comparison of the Pass and Parasound, since I haven't heard the latter, so I won't say to use either. Only you can make that comparison, with the system you have, in the room you use, to make your final choice. Best of luck.