Although some result are put,set protective line, but simple work puts some HI-FI level to improve acoustic quality, reduce needless sound to catch, often can omit this part safeguard.

• 尽管有的功放设有保护线路，但有的HI-FI级纯功放为了提高音质，减少不必要的音染，往往会省掉这部份保护措施。