Grundig 30GB - Manual (Page 78)

78
Class Item Description
Sound EQ EQ Sets tone of the audio file output sound being played
(Normal/Rock/Jazz/Classic/Pop/U.B/USER_EQ)
* Press the [OSD] button long to adjust the sound during playing
User EQ 60Hz/250Hz/
1KHz/4KHz/
12KHz
Sets the tone requested by user from low-pitched tone to high-pitched tone
(-12~+12)