Matching a higher-quality codec on both your phone and headphones is the most reliable way to improve Bluetooth sound quality.
The Bluetooth connection itself chooses a codec — the digital format carrying your music wirelessly — and that choice determines how much audio detail survives. When both your phone and headphones support a high-quality codec like LDAC or aptX HD, you hear the difference. When they don’t match, the connection falls back to SBC, the universal baseline. The fix starts with knowing what your devices speak.
Which Bluetooth Codec Matters Most for Sound Quality
The codec your devices negotiate sets the bitrate ceiling. SBC is the mandatory A2DP codec supported by every device, capping around 345 kbps. Higher codecs push beyond that when both sides support them.
One hard truth applies across all: Bluetooth is not lossless. Apple states plainly that Bluetooth never delivers lossless audio, even from high-resolution files. The best codec merely minimizes the loss.
How to Change Your Codec on iPhone and Android
Your phone’s OS controls the codec, with each platform exposing settings differently.
On iPhone: Apple offers no codec picker because AirPods, AirPods Pro, AirPods Max, and Beats headphones all use the Apple AAC codec automatically. The only toggle is in Settings > Apps > Music > Audio Quality, where you can enable Lossless Audio — but that file still compresses over Bluetooth. To avoid lower-quality mode during calls, quit apps using the headset microphone; Apple notes Bluetooth reduces quality while the mic is active.
On Android: Codec selection lives in Developer options. Go to Settings > About phone, tap Build number seven times, then open System > Developer options and scroll to Bluetooth audio codec. Pick the best codec your headphones support — LDAC if both have it, otherwise aptX HD or aptX. Caveats: the setting may not persist across reboots, and Android’s codec API exposes sample rate, bits per sample, and channel mode, but not every phone implements them consistently.
Practical Fixes That Improve Audio Right Now
Codec matching is the foundation, but everyday mistakes degrade audio even with good codecs. Signal strength matters too — matching alone doesn’t guarantee great sound.
Keep devices close. Walls, distance, and your body can trigger bitrate drops. LDAC scales down automatically when the signal weakens, so staying within a few feet with clear line of sight preserves full quality.
Close mic-hogging apps. Any app using your headset mic — voice memo, video call, game chat — forces reduced-quality bidirectional mode. Quit those before critical listening.
Know your gear’s specs. A high-end codec helps only when both transmitter and receiver support it; otherwise, the connection falls back to SBC. Check your headphone model’s spec page before assuming LDAC or aptX HD — especially if you’re shopping for a speaker; our roundup of the best bluetooth speakers for sound quality focuses on models supporting higher codecs.
Understand AAC’s platform split. AAC sounds excellent on iPhones but varies in quality on Android. An Android user with AAC-only headphones may get better results forcing SBC at a higher bitrate in Developer options.
Skip “hi-res” expectations. Streaming 24-bit/192kHz over Bluetooth doesn’t deliver hi-res sound since Bluetooth can’t carry it. Source quality matters less than codec — a well-mastered 320kbps MP3 over LDAC can beat a lossless file over SBC.
FAQs
Why Does My Bluetooth Audio Sound Worse During Calls?
Bluetooth switches to lower-quality mode when the mic is active because the connection carries audio both ways. Quitting mic-using apps restores full quality for music.
Will a High-Res Streaming Subscription Improve My Bluetooth Sound?
Only marginally. Bluetooth is lossy regardless of source, and Apple explicitly states it’s not lossless. The codec matters far more than source quality, so upgrading won’t help unless your gear supports LDAC or aptX Lossless.
Does LDAC Always Sound Better Than AAC or aptX?
Not automatically. LDAC hits 990 kbps only at close range with a strong signal; when weak, it steps down. A stable aptX HD connection can match a fluctuating LDAC one, so codec support alone doesn’t decide.
References & Sources
- Apple Support. “Play lossless audio on iPhone.” Confirms AirPods use AAC, Bluetooth is not lossless, and mic use reduces quality.
- Audio-Technica. “What are the differences between Bluetooth wireless codecs?” Details codec bitrates, including LDAC at 990 kbps and SBC as A2DP baseline.
- Android Developers. “BluetoothCodecConfig.” Documents Android’s codec API and SBC as mandatory codec.