聲響效果是甚麼?

Stereo systems are expensive. The reason some charge more is because they have good sound effect (聲響效果 ). Suppose you are playing classical music with a stereo system, some good system allow you to tune up individual part of the music like only the violin, only the bass, or only the cello. For the cheap ones, you can only tune up the volume of the whole music without individual control. Some good sound effect make you feel you are actually sitting in the concert hall listening. Some movie theaters use surround sound system which make you feel the sound moves from left to right as the character on the screen talking and walking from left to right. These are all good sound effect. This is what 發燒友 paid for.

"sound effects" from audio equipment.

Do you mean "sound effects"?