Soundstream MOSFET 50W x 4 Owner's Manual page 11

Installation Method 2:
Using the screw holes at the sides of the unit (ISO Mount).
1. Remove the hooks on both sides.
2. Select a position where the screw holes of the mounting bracket supplied with the
car and the screw holes of the main unit become aligned, tighten the screws on each
side, and re-mount the brackets with the factory hardware in the original location.
NOTE:
1 and 10 are not used for installation method2.
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