功放上的这些字母是什么意思?DELAY LIVE POPS CLAS DISCO HALL MATR STEREO SURROUND NIGHT LOUDNESS BASS+ TREBLE+ BAL R BAL L
ECHO DELAY LIVE POPS CLAS DISCO HALL MATR STEREO SURROUND NIGHT LOUDNESS BASS+ TREBLE+ BAL R BAL L