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Re: Definitely a better way of visualising it !!!!!!!

You are so dramatic Soundmind and wrong again. A no feedback amp can be perfectly stable. All it takes is forethought to design something with intrinsic linearity then there is no need for compensation.

They tried feedback for turntables as well with direct drive and PLL control. Turned out that people liked the sound better with the PLL switched off (the fact that turning it off was even an option is rather telling), even though the speed was no longer completely "correct". It turned out that the PLL was constantly over or under speed never really on the right speed but more importantly it was constantly changing speeds. It never settled on a speed. This was audible even though no one predicted it could be at the time. The engineers were convinced that once the PLL "locked" the speed all their problems were solved. They were wrong and listeners went back to their linn belt drives with high mass platters.

A feedback amp is constantly changing its signal due to the feedback itself and back EMF from the speaker (making the amps sound potentially very speaker dependent), you call this stable. The non-feedback amp may drift over days or weeks but from moment to moment I would argue its more stable, analoguous to belt drive vs. a quartz locked direct drive.

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