If your Harmony A1 / A2 has audio stuttering, dropouts, crackling, or distortion, first confirm how the source device is connected to the transmitter, and then follow the relevant troubleshooting steps below.

1. Confirm the Connection Method

Q1: How is my playback device connected to the transmitter?

Please confirm whether your phone, tablet, computer, TV, or other audio source is connected to the transmitter using:

• ● Bluetooth
• ● AUX audio cable

If you are using Bluetooth, refer to Section 2, “Bluetooth Input Issues.”

If you are using an AUX cable, go directly to Section 3, “AUX Input Issues.”

2. Bluetooth Input Issues

Q2: What should I check first if the audio stutters over Bluetooth?

First, confirm that the transmitter has been updated to the latest firmware version.

Newer firmware versions include improvements to Bluetooth connection stability. After updating, restart the transmitter, reconnect your playback device, and test again.

Q3: How can I tell whether the stuttering is caused by the network?

If you are streaming online music or video, try the following:

• 1.  Switch to another song or video.
• 2.  Play an audio file stored locally on your phone, tablet, or computer.
• 3.  Switch from Wi-Fi to a cellular network.
• 4.  Check whether the video is also buffering or freezing.

How to interpret the results:

• ● If locally stored audio plays normally, the issue may be related to the network connection or online content.
• ● If switching to a cellular network solves the problem, check the original Wi-Fi or internet connection.
• ● If both online and locally stored audio stutter, continue checking the playback device, Bluetooth distance, and wireless interference.

Audio interruptions caused by network buffering may sometimes sound like a Bluetooth connection problem.

Q4: How can I tell whether the issue comes from my phone, tablet, or computer?

Try the following:

• 1.  Restart the current playback device.
• 2.  Switch to another song, video, or playback app.
• 3.  Connect a different phone, tablet, or computer to the transmitter.
• 4.  Play the same or similar audio for comparison.

How to interpret the results:

• ● If the problem disappears with another playback device, the issue may be related to the original device, app, or operating system.
• ● If the problem continues with another device, check the Bluetooth distance and wireless environment.

Q5: Can the distance between the playback device and transmitter affect the audio?

Yes.

Move the phone, tablet, or computer closer to the transmitter, and make sure there are no walls, metal objects, or large devices between them.

This refers specifically to the Bluetooth connection distance between the playback device and the transmitter.

If the audio returns to normal when the device is moved closer, the original distance, obstruction, or device placement may have affected the Bluetooth connection.

Q6: Can nearby Wi-Fi devices cause audio stuttering?

Yes, they may.

Avoid placing the transmitter directly next to:

• ● Wi-Fi routers
• ● Mesh Wi-Fi nodes
• ● Wireless bridges
• ● Streaming boxes
• ● Desktop computers
• ● Game consoles
• ● Other wireless transmitting devices

Keep the transmitter at least approximately 1 meter / 3 feet away from Wi-Fi routers or other strong wireless signal sources, and then test again.

Do not place the transmitter directly on top of or beside a Wi-Fi router.

Q7: What should I do if the Bluetooth audio still stutters?

Try the following additional steps:

• 1.  Delete the transmitter from the Bluetooth device list on your playback device.
• 2.  Restart both the playback device and the transmitter.
• 3.  Pair them again.
• 4.  Temporarily disconnect other Bluetooth headphones, speakers, or smartwatches from the playback device.

Firmware, network performance, playback device, Bluetooth distance, and Wi-Fi interference should be checked first.

3. AUX Input Issues

Q8: What should I do if the audio is distorted when using AUX input?

Follow these steps:

• 1.  Make sure the AUX plug is fully inserted.
• 2.  Unplug and reconnect the AUX cable.
• 3.  Check whether the cable is loose, bent, or damaged.
• 4.  Test with another AUX cable.
• 5.  Reduce the output volume of the audio source.
• 6.  Turn off EQ, bass boost, volume enhancement, or other sound effects on the source device.

If the distortion disappears after lowering the source volume, the original input signal may have been too strong.

Q9: What volume level should I use on the audio source when using AUX input?

Start by setting the volume of the phone, TV, or other source device to approximately 50%–70%, and then adjust gradually.

• ● If you hear distortion, crackling, or clipping, reduce the source volume.
• ● If the audio is too quiet or background noise is noticeable, slightly increase the source volume.

Avoid setting the source output level too high or too low.

4. Wireless Transmission Between the Transmitter and Speakers

Q10: Can the distance between the transmitter and speakers cause audio stuttering?

Yes, it may.

Move the speaker closer to the transmitter and make sure that:

• ● The path between the transmitter and speaker is as clear as possible.
• ● The signal does not need to pass through multiple walls.
• ● The signal is not blocked by metal objects or large devices.
• ● The transmitter is not placed inside a metal cabinet or behind a TV.
• ● The transmitter is positioned in an open and elevated location whenever possible.

If the audio is normal at close range but stutters at a greater distance, the issue may be related to transmission distance, obstructions, or the wireless environment.

Q11: What should I check if only one speaker has audio problems?

If one transmitter is broadcasting to multiple speakers and only one speaker has stuttering, dropouts, or distortion, the audio source and transmitter can usually be ruled out.

Check the affected speaker:

• 1.  Is it too far away from the transmitter?
• 2.  Are there walls, metal objects, or large devices between the speaker and transmitter?
• 3.  Is it too close to a Wi-Fi router, wireless device, or other interference source?
• 4.  Move the speaker closer to the transmitter and farther away from possible interference sources, then test again.

If the problem disappears after moving the speaker, the issue was likely caused by transmission distance, obstructions, or wireless interference at that location.