Why does my music sound distorted or unstable via AUX input, but speech sounds fine?

If you're experiencing poor audio quality, pitch fluctuations, or distortion when playing music via the AUX input of your Harmony 2 / Quartet 2 (Avantree Flex) transmitter—but speech or spoken content sounds normal—this is likely due to an input level compatibility issue.

🔍 Cause:

The AUX input on Harmony 2 is designed for consumer-level line output (~1V RMS).
However, many professional mixers, soundboards, or DJ equipment output a much stronger line signal (up to 4–6V), especially on music channels. This overloads the transmitter’s analog input, leading to:

• Distortion, clipping, or compression artifacts

• Audio pitch wobble or instability

• Music sounding worse than speech (due to broader frequency and dynamics)

✅ Solution:

If you're using a mixer or audio console (e.g., in restaurants, churches, or live performances), please:

🎚️ Lower the Output Signal:

• Reduce the master output level of your mixer or AUX send to 25–30%.

• If your mixer has multiple outputs, use a “Record Out” or “Monitor Out” port instead of the main out (they’re usually lower level).

🔌 Optional:

• Use a passive inline attenuator (e.g., -10dB or -20dB) between the mixer and the Harmony AUX port to ensure signal stays within range.

• Double-check EQ or gain boost settings on music channels — aggressive bass/treble boosts may cause imbalance.

💬 Still need help?

If you’re unsure how to adjust your mixer settings, feel free to send us a photo of your setup — we’re happy to help.