High-End Audio Articles 
Audio Technology
Here are some good audio articles for audiophile's convenient reference.
AMPLIFIER
PediaView Electro-schematics Knowledge-rush Basic Electronic
The Class-A Amplifier Site Articles by Pass Labs Class A Amplifier Tutorial Class-A amplifier
Build a Class-A Amplifier Pass diy Andiha Audio Amplifier Jean Hiraga's Class-A Amplifier
LOUDSPEAKER
The Art of Speaker Design NUTSHELL hi-fi Loudspeaker Design diy Loudspeakers LINKWITZ LAB
Loudspeaker enclosure wiki Speaker Box Design diy
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