Spotify Sounds Distorted on Apple CarPlay? Check This Before Blaming Your Car Speakers

If your car audio sounds harsh, distorted or muffled after an upgrade, do not immediately assume that a speaker, tweeter or amplifier is faulty.

We recently heard very similar complaints from three customers. One thought a front pillar tweeter was defective. Another heard a whistling or distorted character at higher volume, particularly on the passenger side. In one case, the cause was simply Spotify playing at a lower quality during the active in-car session.

Use the checks below before removing equipment or starting a warranty claim.

1. Try another audio source

Do not test with Spotify alone. Play the same part of the same song from another source, such as:

• a downloaded high-quality track;
• Apple Music, Tidal, YouTube Music or another streaming service;
• DAB or FM radio;
• USB audio;
• Bluetooth instead of CarPlay, or CarPlay instead of Bluetooth.

If the problem disappears with another source, the speakers and amplifier are unlikely to be the cause. Check the original app, connection and phone settings.

2. Remove any AUX cable

If an AUX cable is connected, remove it completely from the car—even if you are not actively using it.

A poor-quality, damaged or partially connected AUX lead can introduce noise, distortion or interference. Test the system again with the cable removed.

3. Unplug cigarette-lighter and 12V accessories

Remove devices connected to the cigarette-lighter or 12V sockets, including:

• phone chargers;
• USB charging adapters;
• Bluetooth or FM transmitters;
• dashcam power supplies;
• other plug-in accessories.

Cheap or faulty power adapters can add electrical noise to the vehicle. Unplug them all, test the audio, then reconnect one device at a time.

4. Check Spotify quality while connected to the car

One customer had already set Spotify's normal streaming settings to Very High, but the active in-car session was showing Normal quality.

1. Connect the phone to the car and start playing Spotify.
2. Open Spotify on the phone.
3. Tap the green device or car icon at the bottom of the playback screen.
4. If your version of Spotify shows a quality setting for the active session, change Normal or Automatic to Very High.
5. Also check Settings and privacy > Media Quality for mobile data and Wi-Fi.
6. Start the next song and repeat the section that sounded wrong.

Spotify describes Normal quality as approximately 96 kbit/s and Very High as approximately 320 kbit/s for Premium users. In this customer's case, changing the setting transformed the sound on the next track.

Spotify's menus can vary between app versions, plans and connection methods. This does not mean every BMW, iDrive or CarPlay system defaults to 96 kbit/s. The point is to check the quality used by the active connection.

Spotify lists its current settings on its official audio quality page.

5. Return EQ and processing to neutral

While diagnosing the problem:

• set the Spotify EQ to flat;
• remove extreme bass or treble boosts in the vehicle;
• temporarily disable loudness, spatial audio and sound-enhancement features;
• if you use a DSP, leave the vehicle EQ flat and make tonal adjustments through the DSP.

Change one setting at a time and replay the same track. Otherwise, you will not know which change solved the problem.

Why low-quality audio can sound like a faulty tweeter

Low-bitrate streaming can create brittle, metallic or warbling artefacts around vocals and cymbals. On a more revealing upgraded system, these artefacts may sound like tweeter distortion or a blown speaker. The upgrade may not be creating the problem; it may simply make a weakness in the source easier to hear.

When the hardware should be checked

A source-quality problem usually changes when you change the source. A hardware or installation problem is more likely if:

• the same speaker distorts with several clean audio sources;
• the fault always stays on one channel;
• you hear buzzing, crackling or cutting out at moderate volume;
• the problem remains with AUX leads and 12V accessories removed;
• the amplifier enters protection or the fault changes with volume.

Stop increasing the volume if the same fault remains. The speaker, wiring, crossover, amplifier settings or installation may need inspection.

Still having a problem? Send us a video

If the issue remains, record a short video that clearly captures the sound. Tell us:

• your vehicle and audio system;
• the equipment installed;
• which source and connection you are using;
• the track and timestamp that reproduce the problem;
• which checks above you have completed.

WhatsApp the video to Tender Sounds and we will help you work through it methodically.