What is the difference between sound quality and sound effects?

Sound quality refers to the quality of the sound, a certain kind of sound (here refers to the music emitted by the audio equipment) so that the majority of people feel like the degree of preference. For example, the difference between good and bad MP3 sound quality generally lies in whether the treble is crisp and clear, not broken (pitch-shifted or rustling), and whether the bass is rounded.

And sound effects refers to the use of some means of sound processing, to achieve special sound effects. For example, rock, jazz, pop, classical, etc. in MP3.