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Threshold verse Pass Labs how can I justify significant price difference

I'm running currently series one Threshold S500 with the optical bias and Threshold S500 second series as a bi amp config to my JBL 4367. System sounds the way I like it no complains.
Now I've been having thoughts about upgrade amps to Pass Labs 350.5 or 250.5.
250.5 would be in same power range as S500 so my question is since Pass will be priced higher how much better would it sound and is it worth to spend extra $$?
does 250.5 will make so much difference that there is no sense to go up to 350.5? or the only way to get any significant upgrade is to go for 2 of 350.5 and would it be so much better sound than my Thresholds I could justify spending extra $7K!

Can't wait to hear what you guys have to say.


ssg308

Showing 2 responses by kosst_amojan

kosst_amojan
2,095 posts
 
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. 
kosst_amojan
2,095 posts
 
Yeah. They're completely different architectures with completely different gain devices and very different feedback schemes. Nelson likes to say MOSFETs are superior output devices so there's that when it comes to transistors. 

If you like what you've got, fine and dandy. 
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