問題 喇叭補償電路(網路)

[jslin]

各位大哥您好：

一般在後級的輸出上有很多人都建議要加上10ohm+0.1u的補償電路(網路)使電路穩定不震盪，也有人說要是為了將喇叭轉成電阻式負載使聲音表現的更好，但小弟遍尋網路始終找不到其原理，不知何者才對，麻煩各位大哥指點或者提供相關資訊供小弟學習。

麻煩了，謝謝！

[jslin]

感謝各位，在音響大廳的JimHu兄，已經回覆小弟的問題了，以下引述其回覆供大家參考，謝謝！

Zobel network or Zobel filter [Also called Boucherot cell after Paul Boucherot who worked extensively with electrical networks and power.] 1. A filter designed according to image parameter techniques. 2. Audio amplifiers. Zobel networks are used in audio amplifiers to dampen out high frequency oscillations that might occur in the absence of loads at high frequencies. It is the commonly seen series resistor-capacitor combination located directly at the output of the driver stage, just before the output inductor. Typical values are 5-10 ohms in series with 0.1 microfarads. The network limits the rising impedance of a loudspeaker due to the speaker coil inductance. The output inductor found in most power amplifiers used to disconnect the load at high frequencies further aggravates this phenomenon. See Douglas Self's book for a good discussion of audio amplifier Zobel networks. 3. Loudspeakers. Some loudspeaker crossover designs include Zobel networks wired across the tweeter (high frequency) driver to compensate for the rise in impedance at high frequencies due to the inductance of the voice coil. The goal here is to try to keep the load seen by the crossover circuitry as resistive as possible. [After Dr. Zobel of Bell Labs.]