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Class A amps

I've read a few articles on class A amps but still don't have a good understanding of how it affects sound quality. I've even seen amps which can be swithced into class A mode or AB. Does anyone have experience with this type of unit? Does class A have a true audible advantage or can it be detected only by test instruments? If it is audible, in what resepects? Thanks, Rick M.
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larry5729
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I am thinking about upgrading my ARCAM AVR 550 to a new ARCAM AVR 30.  The ARCAM AVR 30 has G Class amplification.  I believe the first 50 watts are pure Class A.  This will cost me an extra $3,000 ($6,000) total.  Will I hear the difference in sound quality and is it worth the cost difference.  The reason why I use an AVR receiver it to watch TV through two front towers, a center channel and two REL S2’s.  I use this to listen to 2 channel.  I need the flexibility.  
I would be curious what some of the experts in this group would say?


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