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Two-channel high power system
In this application, the APX2121 is used to drive a pair of subwoofers.
Setting the gain
After completing the installation, follow these steps to set the gain control and
perform the final system checks.
1.Turn the gain control all the way counterclockwise.
2.Turn the vehicle’s ignition switch on.
3.Turn the source unit on.
4.Set all tone or equalization controls to flat positions and turn loudness off.
5.Play a CD or tape and set the volume control to 75% of full level.
Note:
If the system uses an equalizer, set all frequency controls to the flat
position.
6.Slowly increase the gain control. Stop when you hear a slight audio distortion.
FUSE
30A
+12V REM GND
4Ω BRIDGED
L R
Subwoofer Subwoofer
apx2121_4241_1301.qxd 2/6/2008 11:57 AM Page 14