Threshold verse Pass Labs how can I justify significant price difference

Get the the Pass and find out for yourself. You can always sell it, if its not what you seek. But I am sure you will be wondering what the hell the people in this thread were talking about.

I'd hardly say there's no significant difference between Threshold products and Pass Labs! Major differences to note: Pass Labs amps use FETs instead of BJTs, they use Su-Sy feedback, they're high bias region is single ended rather than balanced. They represent the more evolved designs of a more experienced engineer. 

Unless you're using obscenely inefficient speakers, which you're not, you don't need 250+ watts. I'm listening to 91dB sensitive speakers powered by a 31 watt Pass F5. It's more power than I need. And it sounds excellent. 

So another words there is big difference between say S500 and 250.5?

It sounds like no one posting above has direct experience comparing the two, so their guess is no better than your own.  Hopefully someone who has compared the two will chime in.

I have to agree with the comment about no one has (directly) compared the two. The person saying the Pass 'has' to be better, by saying what transistor type it uses?? My comment was also no direct experience. What I  would say in general is amps are not as different to the final sound as most of the other components.!!!Sure someone might rave about what their 'new amp' did for them. But the op already has a classy amp(s). no slouch there. So would there be any difference? yeah, and two BUTS... But is the difference in the sound going to be worth it? but is it the best thing to do/buy? IMO still a no. Now if the op was having some troubles with the current amps, and was asking to 'fix or replace' Yeah replace them with a Pass.And maybe keep that in mind when the current amps do have problems.. in ten years...??