I've connected A1200's and A600's to various setups, one a very good surround system and they're clean...this is with bog standard Amiga PSU's too. If someone has noise, hum or distortion my first guess would be leaking caps, particularly audio output caps.
On the other hand I've owned laptops that are literally unusable on the audio outputs, buzzing, clicking, humming various low frequency crap due to self interference!
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