9
System #1: Adding a Subwoofer to a Factory Radio using Speaker-Level Inputs
Factory
Radio
Speaker-level
outputs
+
+
+
+
+
+
Subwoofer
Optional
Subwoofer
in parallel
lf two subwoofers are connected like this, they are in parallel, and the
impedance of each subwoofer must be 4 Ohms or greater.