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Preamplifier - Wikipedia
前置放大器 - 百度百科
Best Preamplifiers: Under $2,000 - The Absolute Sound
What Is a Preamp? - How-To Geek
Editors’ Choice: Best Preamplifiers $2,000 – $5,000
前置放大器的作用及其原理是什么 - 电子发烧友网
Best Preamplifiers: $50,000+ - The Absolute Sound
Bel Canto Pre5 Preamplifier and REF501S Amplifier Review
Preamplifier Guide – Audio Advisor Learning Center
Intro to home audio power amplifiers and preamps - Crutchfield