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本帖最后由 borrego 于 2022-2-7 00:07 编辑
拓品产品的低失真, 是在电路中使用高度负反馈来实现的.
节一段何庆华的产品描述: http://www.audio-gd.com/Master/Master9P/Master9PACH.htm
负反馈技术的运用,最大的目的是降低失真度。
有些人认为负反馈虽然令失真度降低,却同时令听感变得不自然。
虽然负反馈设计静态负载测试时的失真率较低,但一旦连接真实喇叭这样的感性负载时,喇叭工作时的电动势从反馈环路回输到放大器输入端,产生的各种失真就会大幅增大并对音质影响尤大。而完全无反馈的设计则可以完全避免了这一缺点。
另外国外对负反馈比较有名的见解是Nelson Pass : https://www.passlabs.com/technical_article/audio-distortion-and-feedback/
Negative feedback can reduce the total quantity of distortion, but it adds new components on its own, and tempts the designer to use more cascaded gain stages in search of better numbers, accompanied by greater feedback frequency stability issues.
The resulting complexity creates distortion which is unlike the simple harmonics associated with musical instruments, and we see that these complex waves can gather to create the occasional tsunami of distortion, peaking at values far above those imagined by the distortion specifications.
楼主现在所喜欢的实际上是高度负反馈的声音, 而不是真正低失真的声音。发烧都会有一个过程, 楼主在真正了解电路设计或者听过好的无负反馈电路设计产品前, 仍会相信像拓品这种在使用一个简单电阻作负载的测试中得高分的产品是最好的。 |
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