Marshall Stanmore II Troubleshooting

Audio transmitted to the device sounds fuzzy or crackles while playing. 

Adjust volume knob until sound can be heard at a comfortable level.

Restart your Stanmore and adjust treble and bass knob appropriately to your liking.

This wall speaker is not water-resistant, so if liquid does get inside, it could cause damage. See our main speaker repair guide to check for any liquid.

A strong electrical field surrounding the speaker could interrupt connection. Move the speaker away from large appliances such as microwave ovens, gas cookers, or fluorescent lights.

Likely an issue with the Subwoofer or Tweeters, replacement required. See our subwoofer and tweeter repair guide to replace.

The device doesn’t turn on when the power button is pushed. 

The speaker has no battery of its own. Ensure it is plugged in properly to a functioning power outlet.

Ensure the power cable is in good condition.

Foreign objects like dust, food, or grease could be stuck inside, or the lever is broken. Refer to our power switch replacement guide to clean or replace.

Sound doesn’t transmit to the device when plugged into an audio source. 

RCA cables require specific colors to be used for audio input. Check that each jack is connected to the correct port. Remember: white jack for left and red jack for right.

The RCA input slot could be worn out or damaged.

The Aux input slot is likely damaged or blocked by something. Refer to our Aux board replacement guide.

When the device is turned on, the audio source doesn’t show as connected on the source’s Bluetooth settings. 

Press the button labeled “SOURCE” to alternate between Bluetooth, AUX and RCA audio sources. May also be changed in the Marshall Bluetooth app.

Pair your Stanmore II with the Marshall app to update its firmware. Then restart the Bluetooth speaker, and try connecting.

The device may not actually be turned on due to a faulty power jack. Refer to our power jack replacement guide.

When your device is connected successfully, but is not outputting any sound or doing so infrequently.

Your phone or laptop's Bluetooth may be out of date and need updating.

Make sure Bluetooth on your computer or phone is on, and make sure the Source Button is set to the Bluetooth icon.

The speaker will forcibly attempt to stop at least one device from playing audio and prioritize the other, this could cause confusion if the speaker prioritizes a different device than the one you intend it to. To fix, disconnect the other device/s and replay from the device you intended to play audio from.

Make sure your device that is outputting the audio via Bluetooth (i.e. phone or laptop) is close to the speaker and that no large obstacles or walls are in the way.

The Stanmore may have a failing Bluetooth module, which is integrated to the main motherboard.