SoundMax SM-SA604 - Manual (Page 11)

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Fig. 5. 2-channel mode
If the amplifier needs high power output to drive two subwoofers, connect and set it as shown in Fig. 5.
The usage of the low-pass filter is described in Operation elements and in / outputs chapter
(1) To the car radio, left output (3) Subwoofer
(2) To the car radio, right output (4) Subwoofer
Fig. 5