VTL S-400 II series Owner's Manual page 32

2. MED: Both switches are forward towards the front panel. This setting allows for better
loudspeaker control and may be the most suitable for wide range of speaker types.
3. HI: Both switches are towards the back of the amplifier. Best loudspeaker control, but may have
some impact on sound quality.
S-400 Amplifier Owner's Manual
VTL
LOW DF setting
MED DF Setting
28