Q: What does the LED indicator flashing mean when the switch is in On or Auto mode?

The flashing of the LED indicator is completely normal. According to the DSW PRO 400 documentation, the flashing patterns of the blue indicator behind the logo simply indicate which function has been selected . When you set the switch to "On" (constant power) or "Auto" (automatic activation on audio signal), the indicator flashes to confirm the mode change: Stable green indicator = The subwoofer is powered and active Yellow indicator = Standby mode Flashing = Confirmation of the selected mode or volume adjustment This flashing does not indicate a problem. It is simply the visual feedback from the DSW PRO 400 confirming that your settings have been successfully recorded.

Question 1

What does the LED indicator flashing mean when the switch is in On or Auto mode?

Accepted Answer

The flashing of the LED indicator is completely normal. According to the DSW PRO 400 documentation, the flashing patterns of the blue indicator behind the logo simply indicate which function has been selected.

When you set the switch to "On" (constant power) or "Auto" (automatic activation on audio signal), the indicator flashes to confirm the mode change:

Stable green indicator = The subwoofer is powered and active
Yellow indicator = Standby mode
Flashing = Confirmation of the selected mode or volume adjustment

This flashing does not indicate a problem. It is simply the visual feedback from the DSW PRO 400 confirming that your settings have been successfully recorded.

Question 2

What does a flashing green LED on the DSW PRO 400 mean?

Accepted Answer

The LED located behind the logo of the DSW PRO 400 can display different states to indicate its operation.

Stable green LED (steady): The subwoofer is powered on and functioning normally.

Flashing green or other color LED: A repeated flashing indicates that the subwoofer is responding to a command or is processing a function. The light may flash to signify:

Receiving a remote control command
Mode change (On/Auto/Standby)
Confirmation of an adjustment (volume, phase, low-pass filter)
Activation of a preset mode (Cabinet, Corner, Mid-wall, Mid-room)
Night mode activated

If the LED is flashing continuously without an apparent reason and the subwoofer is not producing sound, refer to the manual for specific diagnostic codes. If the problem persists, contact Polk Audio support.

Question 3

Why doesn't the LED indicator on the DSW PRO 400 light up?

Accepted Answer

The blue LED indicator located behind the logo of the DSW PRO 400 should normally blink every time you press a button on the remote control. If this indicator does not light up at all, it usually indicates a power issue. Here’s how to diagnose and resolve this problem:

1. Check the main power - Make sure that the AC MAIN switch located at the back of the subwoofer is in the “ON” position. This is the main switch that controls all the power to the subwoofer.

2. Test the electrical outlet - Check that the wall outlet is working properly by plugging in another device (lamp, charger, etc.). If the outlet does not provide power, try another outlet or check if a circuit breaker has tripped.

3. Inspect the power cable - Ensure that the power cable is fully inserted into the DSW PRO 400 and the wall outlet. Also, check that the cable is not damaged (tears, cuts, wear of the insulation).

4. Check the fuse - The protection fuse is located under the power cable socket at the back of the subwoofer. Unplug the power cable and open the fuse compartment. If the inner filament of the fuse is broken or blackened, the fuse is blown and must be replaced with a fuse of the same amperage. The type and amperage of the fuse are indicated on the back panel of the DSW PRO 400.

5. Reset the subwoofer - If the LED indicator remains off after the previous checks, completely unplug the subwoofer from the outlet for 15 minutes, then plug it back in and switch the AC MAIN switch to the “ON” position.

If the blue LED indicator still does not light up after these steps, there is likely a more serious internal issue with the electronic board or amplification of the DSW PRO 400. Contact an authorized Polk Audio dealer or customer service at 1-800-377-7655 (U.S. and Canada) or 410-358-3600 (other countries) for assistance with the device.

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