Soundstream Technologies X3.71 - Manual (Page 10)

Controls & Functions
5. Bass Boost Control
4.Subsonic Filter Control
SUB
SONIC
15Hz 40Hz
Variable Subsonic Filter (15Hz - 40Hz) :
The Subsonic filter will roll off all of the unwanted frequencies below 15Hz - 40Hz.
This will allow the amplifier to use that wasted power on the audible bandwidth.
By using the bass boost function, bass notes at 45Hz are emphasized as much as 18dB.
BASS
BOOST
0 +18dB
CONT
ROLS & FUNCTIONS
8
X3.71 X3.60