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From Pass X250,5 to 350,5 : what to expect?

Hi
I am planning on going up from my 250,5 to 350,5 but first decided to ask if it is worth it.Are there any sonic benefits in upgrading to a more powerful amp in a ,5 line?As far as i know in the previous line (250,350)going up meant actually downgrading sound because 250 amp was sonically superior to 350 one.I do not really need more power but i heard that 350,5 is way better soundwise than 250,5.Is that true?Thanks for your insights on this matter.
overhang
fatcataudio
106 posts
 
There is a difference in the design, the X350.5 use no negative feedback in the circuit. It also runs pure class A to 50 watts versus the 30 of the 250.5.
pubul57
3,712 posts
 
Well the NFB would be a signficant difference for sound quality and that might explain the difference some have heard, although I suspect the 30 versus 50 in Class A would not be to relevant with the Revels.
spatine
84 posts
 
Fatcataudio, do you expect much of a difference between x350.5 vs x600.5 vs xa160 for either a Wilson Watt Puppy 8 or a Sonus Faber Elipsa or the like? Pass Labs thinks the xa160 should have enough power to handle those speakers. I have my doubt. Yet that pure class A of the xa series is tempting at the 80 db sound level.
tboooe's avatar
tboooe
1,009 posts
 
spatine, what efficiency and nominal (and minimum) impedance of your speakers? You will be very surprised at how little power you actually need if you listen at normal listening levels. I actually calculated the power my speakers needed at varying volumes, listening distances, and peak music levels. I was surprised to just how little power is required.
glai's avatar
glai
442 posts
 
owned 350.5, 250.5 and 150.5

350.5 is smoother and also has more bass impact, 250.5 is brighter and bass is a little loose, transparency is about the same. Tried 87dB and 90Db speakers. I rather have 150.5 than 250.5
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