Wireless earbuds buying guide: codecs, ANC and fit

The best wireless earbuds for you are the ones that fit your ears securely, support a Bluetooth codec your phone can actually use, and offer noise cancelling that suits where you listen. Fit matters most, because a good seal improves bass, noise cancelling and call quality all at once. This guide explains codecs, ANC, water resistance and the everyday features worth paying for.

Start with fit, because everything depends on it

In-ear earbuds sound their best when the ear tip seals your ear canal. Apple puts it simply in its AirPods Pro ear tip guide: “When the fit is right, you experience better noise cancellation, and music has a rich bass sound.” Sony gives the same warning in its help guide: if the tips don’t match your ear canals, you may lose sound quality, noise cancelling and call performance.

What that means when you shop and set up:

• Try every tip size in the box. The size fitted at the factory is only a starting point, and your left and right ears may not need the same size. Apple says AirPods Pro come with three to five tip sizes, depending on the model.
• Run the fit test if there is one. On AirPods Pro, the Ear Tip Fit Test (called the Acoustic Seal Test on AirPods Pro 3 with iOS 26 or later) plays a sound and checks the seal. Some other brands offer a similar test in their companion apps.
• Insert them a little deeper. Sony recommends seating the tip as deep in the ear canal as is comfortable.
• Think about stability. If you run or work out, look for wing tips, fins or a shape that locks into the ridges of your outer ear.
• Know what open-fit means. Earbuds without silicone tips feel lighter and let more of the world in, but because they don’t seal, their bass and noise cancelling usually can’t match sealed designs.

If you can, buy from a store with an easy return policy. Comfort over a two-hour listen is hard to judge from a spec sheet.

Bluetooth codecs: what your phone can actually use

A codec is the method used to compress audio so it can travel over Bluetooth. Earbud boxes often advertise several, but only the codec that both your phone and your earbuds support gets used. (Our tech glossary has a short definition if you want to bookmark it.)

Codec	Made by	iPhone	Android	What it’s for
SBC	Bluetooth standard	Yes	Yes	The universal fallback every Classic Bluetooth stereo device supports
AAC	Industry standard (MPEG)	Yes, the main codec	Widely supported	Good everyday quality, and the best choice on iPhone
LDAC	Sony	No	Included in Android since 8.0, enabled on many phones	Higher bit rates, up to 990 kbps, with a strong connection
aptX family	Qualcomm	No	Some phones; the versions vary by model	aptX HD for 24-bit audio, aptX Adaptive for adjustable bit rate and low latency
LC3 (LE Audio)	Bluetooth standard	Not listed in Apple’s accessory guidelines as of 2026	Built into Android 13 and later, if the phone’s hardware supports it	Efficient audio, Auracast broadcasts and hearing aid support

If you use an iPhone

Apple’s Accessory Design Guidelines, the technical rules for accessory makers, cover SBC and AAC for streaming music over Bluetooth, plus a low-delay version of AAC. LDAC and aptX aren’t part of that list. In practice, any decent earbuds with AAC support will get the best codec an iPhone offers, so don’t pay extra for LDAC or aptX badges.

If you use Android

Android’s core code has included AAC, aptX, aptX HD and LDAC since Android 8.0, but phone makers choose which codecs to enable. According to Sony, LDAC was contributed to the Android Open Source Project, can reach 990 kbps (about three times the data of standard Bluetooth audio), and in its adaptive mode steps between 330, 660 and 990 kbps depending on connection quality.

Qualcomm’s aptX family covers several versions. aptX Adaptive adjusts its bit rate to the conditions, typically between 279 and 420 kbps, and Qualcomm quotes latency of about 80 ms for gaming and video. Its Snapdragon Sound platform adds support for lossless streaming, but only when the phone and the earbuds both support it.

Want to see which codec is in use? On most Android phones, turn on Developer options and look for “Bluetooth audio codec” while your earbuds are connected.

LE Audio and LC3

LE Audio is the newer version of Bluetooth audio, and LC3 is its standard codec. The Bluetooth SIG says listening tests showed LC3 improving on SBC’s quality “even at a 50% lower bit rate.” LE Audio also adds Auracast, which lets one device broadcast audio to any number of compatible earbuds or hearing aids. Google built LE Audio support into Android 13, but it only works when the phone’s hardware and the earbuds both support it.

A reality check on sound quality: most Bluetooth codecs still compress your music, and fit, tuning and background noise usually matter more than the codec. A higher-bit-rate codec helps most when you listen in a quiet room to high-quality files or streams.

Active noise cancelling: what it can and can’t do

Active noise cancelling (ANC) uses microphones to sample outside sound and plays an inverted signal to cancel it. It is very good at some noises and weak at others.

Sony’s help guide describes it well: the noise canceling function is “effective in low frequency ranges such as airplanes, trains, offices, near air-conditioning, and is not as effective for higher frequencies, such as human voices.” Sony’s noise canceling explainer also notes that noise is reduced, not completely canceled.

In practice:

• Works well on: engine drone, train rumble, air conditioning, fans and road noise.
• Works less well on: conversations, babies crying, keyboard clicks and sudden sounds.
• Depends on the seal: the ear tips physically block much of the higher-pitched noise that ANC misses, so fit and ANC work as a team.
• Needs clear microphones: covering the earbuds’ mics with your hand can weaken ANC or cause feedback.

Most ANC earbuds also have a transparency or ambient mode, which pipes outside sound in so you can hear announcements or traffic. Try it before you buy if you commute on foot or by bike. Some models also adjust ANC automatically based on what you are doing; if the effect seems weak, check whether an automatic mode has switched it down.

Water resistance: reading IP ratings

IP ratings come from the international standard IEC 60529. The first digit covers dust and solids, and the second covers water. An “X” means that part wasn’t rated, not that it scored zero. Definitions here follow the IP code summary on Wikipedia.

Rating	Dust	Water	Realistic use
IPX4	Not rated	Splashing from any direction	Sweat and light rain
IP54	Dust protected	Splashing from any direction	Gym sessions and dusty trails
IPX5 or IP55	Not rated, or dust protected	Water jets from a nozzle	Heavier rain and heavy sweat
IP57	Dust protected	Immersion under defined test conditions	Surviving a drop in a sink or puddle

Ratings describe lab tests, not a license for water sports. Apple’s AirPods water resistance page, for example, rates AirPods Pro 3 at IP57 (up to 1 meter for up to 30 minutes) but says AirPods aren’t designed for swimming or showering. Apple also notes that resistance can diminish over time. If you swim, look for earbuds sold specifically for swimming.

Everyday features worth checking

Once fit, codec and ANC are covered, these features make the biggest difference day to day.

Multipoint. Multipoint earbuds stay connected to two devices at once. Sony’s WF-1000XM6 guide describes the typical use: listen to music from one device while staying ready for calls on either, and switch playback without reconnecting. Read the fine print, though. On Sony’s WH-1000XM4 headphones, turning on multipoint means LDAC can’t be used and the codec switches to AAC or SBC.

Ecosystem switching. AirPods take a different approach: they switch automatically between Apple devices signed in to the same Apple Account. Samsung and Google earbuds also tend to have extra conveniences with their own brand’s phones, so check which features need a matching phone.

Battery life. Compare the rated listening time for the earbuds alone with ANC turned on, then the total with the case. Both are manufacturer figures, so check independent reviews for real-world results.

Call quality. Microphone performance varies widely, especially in wind. If you take lots of calls, look for reviews that include recorded call samples.

Controls and app. Touch controls can misfire; physical buttons or squeeze stems can be easier. A companion app with an equalizer, firmware updates and a fit test is a real plus.

Case and charging. Check the charging port, whether the case supports wireless charging, and whether you can buy replacement ear tips.

A quick checklist before you buy

1. Fit: multiple tip sizes, a fit test, and a shape that stays put for your activities.
2. Codec: AAC for iPhone; on Android, check which of LDAC or aptX your phone supports before paying for either.
3. ANC: judge it on the noise you actually deal with, such as commutes, flights or open offices.
4. Water resistance: IPX4 or better for workouts.
5. Multipoint or ecosystem switching, if you move between a phone and a laptop.
6. Battery life with ANC on, from independent reviews rather than the box alone.

Our buying cheat sheet sums up what to prioritize for earbuds and other gear, and the Smartphones hub has more phone and accessory coverage. If you are upgrading your phone too, our explainer on what camera megapixels don’t tell you is a useful companion read.

The bottom line

Buy for fit first, then for the codec your phone actually supports: AAC on iPhone, and AAC, LDAC or aptX on Android, depending on the model. Expect noise cancelling to tame engines and air conditioning more than voices, and treat IP ratings as protection from sweat and splashes, not permission to swim. Multipoint, a useful app and honest battery life round out a good pair. For more practical advice, browse all our guides.

For more audio and phone guides, visit RedAndWhiteMagz.com.