Bluetooth headset frequency response

The ultimate guide to Bluetooth headphones: Wired is still king for quality

Look, we get it: Bluetooth headphones are convenient. It’s the K-cup coffee machine of audio. Like the aforementioned liquid sadness brewer, Bluetooth is a crappy, expensive facsimile of the real deal—but many, many people enjoy it because it’s convenient and they don’t need gourmet coffee every day.

I’ve never enjoyed the audio quality of Bluetooth headphones, but that’s just me. The sound is better than it ever has been, and it’ll get you 99% of the way there—but not everybody is willing to make that tradeoff. Since USB-C headphones have largely ceded their market advantages over Bluetooth, we have to examine the consumer audio technology’s performance in a world where the headphone jack is disappearing.

We deal in facts around these parts. That’s why we’ve spent the better part of last month testing codecs and their performance ceilings. Spoiler alert: it’s mostly bad news.

Editor’s note, this article was updated on January 13, 2020 to address the announcement of LE audio and the LC3 codec.

How we tested

We use a commercially-available Bluetooth high-def interface with an S/PDIF output to test the Bluetooth output of four flagship phones. This way, we’re able to record test signal output and compare the datasets with our in-house analysis software. We kicked the tires on a 96kHz/24-bit test file to see how Bluetooth handled high-bitrate music, as well as normal 44.1kHz/16-bit files to see how each codec treated CD-quality streaming audio. We then measured the recorded sample against the original file. We used both lograrithmic sine sweeps, and complex signals like square waves in order to provide a more realistic set of tests for how people actually use Bluetooth headphones.

We then fed the data through our charting programs, and plotted responses to identify issues. We also reached out to select companies for comment on these issues, but received no comment.

What we found

Every single Bluetooth codec has significant quality issues—despite many creative solutions employed to make the most of the limited bandwidth the standards employ. For those keeping score at home: not a single codec available can meet wired signal quality. Though Bluetooth audio has come a long way since its noisy beginnings, it’s still not ready to replace the headphone jack. Qualcomm’s aptx HD, and Sony’s LDAC 990kbps codecs come close, but everything else falls far short of the mark.

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Audio frequency response over Bluetooth

Introduction : Using some binaural beat meditation, the vendor claims that their sound frequency goes down to 5 Hz to get better meditation quality. Even though the human ear can’t hear 5Hz, the brain responds to it. The vendor advised using wire headphones because the Bluetooth frequency response is from 20Hz. Question: Why can’t Bluetooth decode 5Hz frequency? I thought the audio is transmitted in binary raw data, and the headphone will decode wherever it receives.

4 Answers 4

Ignore their recommendations.

Binaural beats generate the beat in your mind. They use audible sounds that are close together in frequency (say, 1000 and 1005 Hz.) Your hearing generates the beat from the difference. Playing the 1000 and 1005 Hz will cause you to perceive a 5Hz «beat» that exists nowhere physically — it is literally all in your head.

It doesn’t matter if the speaker, headphone, or audio system can convey a very low frequency signal because the low frequency isn’t actually there. Only the normal audio frequencies need to be conveyed. Bluetooth should do just fine. Hifi systems may go down to 20Hz while others may cutout the low frequencies below 100Hz.

Bluetooth and other audio systems usually filter out low frequencies. Your ear can’t hear them and the speakers can’t effectively reproduce them, so they are filtered out. It saves bandwidth and power when you don’t transfer sounds that no one can hear anyway.

Binaural beats are a thing.

Whether they have any influence on your meditation or whatever is an entirely different question that can’t be answered here.

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Xiaomi Headphones Frequency Response

The list gets constantly updated every time a new Xiaomi headphone frequency response measurement is added.

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You may also find useful our Best Earphones Charts with the top in-ear headphones in different categories such as:

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Xiaomi Headphones Frequency Response Measurements

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