Thanks to Owner-Manuals.com! This manual was exactly what I needed. As Amana was purchased by Maytag and later by Whirlpool, there was no way to receive it from their websites. I was lucky to find this resource.
A comprehensive Operating and Service Manual. All schematics are complete and easy to read. The PCB drawings and complete parts list are very helpful. I would definitely recommend this manual.
Text excerpt from page 24 (click to view)
Adjusting the audio emphasis
(Sound Mode/MEGA BASS)
You can adjust the audio emphasis of the sound you are listening to.
MEGA BASS SOUND
Selecting the sound characteristic
Press SOUND to select the audio emphasis you want.
Choose Normal mode (no indication) To get The whole dynamic range for music such as classical music Powerful, clean sounds, emphasizing low and high range audio. The presence of vocals, stressing middle range audio. Light, bright suonds emphasizing high and middle range audio.
Reinforcing the bass sound
Press MEGA BASS. �MEGA BASS� appears in the display. To return to normal sound, press the button again.