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Pass Labs comparison

I am considering a Pass Labs amp to power my Martin Logan Summits (Summits have internal amp for base). Currently using Rogue M-150 amp. Currently on Agon there is a Pass Labs 350.5 for $6,000, a 250.5 for $3,500 and a 150.5 for $1,900. Are there any differences between these amps other than the power? Do you think the improvement generated by the additional power justifies the incremental cost? If so what kind of improvement can one expect? Thanks for your thoughts.
sgunther

Showing 2 responses by unsound

unsound
7,306 posts
 
These Pass amps are not pure class A. The more powerful amps will run in class A longer.
unsound
7,306 posts
 
The XA amps unlike most typical ss power amps loose power into lower impedance loads. The XA.5 amps are better suited to lower impedance loads.
One has to be carefull when discussing Pass amps, unlike most amp manufacturers, Pass amps differ quite a bit from other Pass amps. Choose your Pass amp(s) accordingly.
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