Check speaker connections and wires . Beginning with subwoofer check all wires and connection points to amplifiers, receivers or speakers. Make sure the cables are securely connected and plugged into the correct places.

These subwoofer rear panel inputs are typically connected to the subwoofer output on the back of receivers or amplifiers. If a the subwoofer is connected to the speaker outputs on the receiver or amplifier check the entire length of the wire connections for defects. If any piece of wire looks frayed, torn or damaged, replace these wires before trying to use the equipment again. Do a quick test on the wires to make sure they are working.

Check sockets, power cable and fuse. Most subwoofers have an LED standby indicator that glows to indicate active power. If it is not lit, make sure the subwoofer is securely connected to a wall outlet, surge protector, or power strip. If the prongs of the plug pop out halfway — that’s enough to prevent power being applied — carefully bend them so that the cable stays connected after you release it. Make sure all relevant switches (e.g. on walls, extension cords, etc.) are switched to the «on» position. If the subwoofer still won’t turn on, try plugging it into a different outlet that you know is working properly.

As with speaker wires, inspect the subwoofer’s power cable for damage or defects. Some subwoofers are equipped with a fuse that may or may not require removal of the rear panel. If the fuse is a feature, and if you’re comfortable with the electronics, check to see if they need to be replaced. Otherwise, please consult the manufacturer or local repair shop first.

Check system and menu settings. If all the wires and cables look good, go back to the menu settings on your receiver or amplifier — you’ll never know if someone might have changed it all by accident. Make sure the subwoofer is linked to the correct audio input selection. Make sure the subwoofer output has not been reduced either.

If your input device offers speaker size settings, select the smallest option first; sometimes setting the speaker size to something larger causes the subwoofer to not receive a signal. Some receivers actually allow subwoofers to work with a large speaker setup, so check your product manual for more information.

Check the connections, turn on the subwoofer and adjust the volume. After checking all connections and settings, turn on the subwoofer. Check the volume level on your subwoofer and receiver or amplifier before sending any audio input. Start at a low volume level and gradually increase it to determine if the subwoofer is working properly. Choose musical test tracks with low bass level, so that there are no questions one way or another.