2. amps-preamps
  3. 1036370656

Class A and B differences?

I have been auditioning the Pass Labs X-250 amp along with the Spectron Digital amp versus my Kinergetics KBA-75 power amp. My system consists of a Sony SCD-777ES, BAT VK-30SE preamp, B&W 803 matrix series II speakers, Acoustic Zen silver ref. ICs, Hologram speaker cables, JPS digital AC and power AC cords along with an Audience power AC cord. I hear the differences between the amps but I was expecting to hear larger differences, like a WOW what have I been missing. The Pass has more detail and seperation but maybe 10% max 15%. Is that the difference between a class A rated amp and a class B rated amp? Or is my Sony CD player or B&W speakers not up to the Pass amp capabilities?

Your comments are appreciated.
bigkidz

Showing 1 response by gecus

gecus
20 posts
 
When I read your thread I was almost sure that you were refering to "Stereophile rating". This is always confusing, although the previous comments were still very interesting.

From my experience having a Pass X-350 and since I experimented with few other speakers and many other amplifiers, in my opinion I think the following:

1- Sean is right. Pass amplifiers need a very good break in period. After a week of using it you should notice another 5-10 % improvement.

2- I would not blame the Sony SCD-777, but the B&W 803. Your speakers are limiting the overall system performance.
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