Owners of modern Xiaomi equipment and other electronics often face the need to transmit audio signals to wireless headphones or external acoustic system. Standard Bluetooth transmitters from the Chinese giant are compact devices that can turn any sound source with a 3.5 mm connector or optical output into a full-fledged wireless transmitter, this solution is ideal for old TVs, car radios or stationary computers without a built-in communication module.
The process of activating a gadget is usually easy, but there are a number of nuances that lead to the desynchronization of sound or the inability to detect the device. The module can work in two modes: as a receiver (Receiver) and as a transmitter (Transmitter). In this article, we will discuss exactly the scenario of signal transmission, when the source is your TV or phone, and the target is a wireless headphone or speaker.
The quality of the data transfer depends on the version of the protocol and codecs supported by both devices. If you plan to use the gadget to watch movies, it becomes critical to have support for the aptX Low Latency codec, which minimizes audio delay. Without this technology, the dissynchronization between the movement of the actors’ lips and sound can be up to several seconds, making viewing content unbearable.
Preparation of equipment and compatibility check
Before you start any manipulation, make sure you have all the necessary components on hand and they are in good condition.The basic set includes the Bluetooth adapter itself, a power cable (usually a micro-USB or USB-C) and a sound cable (3.5 mm or an optical Toslink).
Pay attention to the state of the battery inside the device if the model is self-contained. Many users forget that when working in Transmitter mode, the power consumption is much higher than in standby mode. If the indicator flashes red or does not light up at all, connect the gadget to the charger for 1-2 hours before the first attempt to pair.
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Check if your Bluetooth headset supports an A2DP profile, as without it, stereo sound transmission is not possible and you will only get a monophone signal or noise.
If your TV is equipped with only optical output, you will need the appropriate cable, as the standard AUX 3.5 mm may not provide the required quality or not work with some models of Mi Bluetooth Audio Transmitter. If you use a smartphone, make sure that the headphone jack is active and not occupied by other peripherals.
Step-by-step instructions for activating the transmitter mode
The most important step is to get the device to work properly. Most Xiaomi models have a multifunction button that is responsible for turning on, off and switching modes. Short press usually turns on the device, and prolonged retention (more than 3-5 seconds) changes mode from receiver to transmitter.
Visual status information helps you understand what's happening to your gadget at the moment. When the LED starts flashing blue quickly, it means that the pairing mode is activated and the device is visible to external scanners. If the indicator is constantly on or flashing slowly, try resetting to the factory settings by holding the button for 10-15 seconds.
☑️ Primary transmission setting
Once the transmission mode is activated, you need to immediately go to the search for the device on the receiving side. The window of visibility of the adapter is limited in time (usually 2-3 minutes), after which it goes into standby mode. If you do not have time to pair, the procedure for turning on the search mode will have to be repeated.
Interface with TV and external acoustics
Connecting to a TV is the most common use case. Once the transmitter is switched to transmit mode and connected via AUX or optical cable to TV, you need to open the Bluetooth menu on the TV (if you connect the TV itself to the headphones) or, more often, simply turn the headphones on in search mode. In this scheme, the transmitter acts as a bridge between the linear output of the TV and the wireless headset.
A name like Xiaomi Audio or Mi Transmitter should appear on the list of available devices on your headphones or column. Click on it to establish communication. Successful connection is usually confirmed by a change in the way the indicator blinks: it starts to burn with even blue light or slowly blinks once every few seconds.
⚠️ Note: If the TV uses an optical output, make sure that the output format is selected in the audio settings. PCM, Because many simple transmitters do not know how to decode Dolby Digital surround sound, or DTS fly-by.
For owners of Xiaomi Smart TV (Mi TV), the process may be different if you are trying to connect the transmitter as an external output device. In this case, you need to go to Settings → Sound → Output and select an external system. However, more often than not, the Xiaomi transmitter is used specifically to add Bluetooth functionality to conventional TVs that do not have this option.
Use in the vehicle and with mobile devices
In a car, a Bluetooth transmitter allows you to broadcast sound from a navigator or an old one. MP3-The player on the regular audio system through FM-range AUX-If your tape is holding the entrance. AUX, Just connect the transmitter with a cable. 3.5 mm-3.5 This will ensure the best sound quality without radio interference typical of the FM-modulators.
When using a mobile phone as a source (although phones usually have Bluetooth themselves, sometimes you need to transfer the sound to a specific headset), it is important to consider power. If you connect the transmitter to the headphone jack of a smartphone, make sure that its battery is enough for long-term use, as the device will consume the energy of the phone.
Special attention should be paid to fixing the device in the cabin of the car. Xiaomi compact models are easily lost between the seats. It is recommended to use an adhesive base or a special holder to prevent the gadget from falling under the pedals while driving, which can lead to short circuit or damage to the cable.
Table of compatibility and characteristics of codecs
Understanding the differences in codecs will help avoid disappointment with sound quality. Not all devices support the same standards for compression and audio streaming. Below is a comparative description of the main parameters that should be considered when choosing a use case.
| Codec | Sound quality | Delay (Latency) | Compatibility |
|---|---|---|---|
| SBC | Basic | High (200+ms) | Universal. |
| aptX | High (CD-like) | Medium | Android, some TVs |
| aptX LL | High. | Low (<40 ms) | Specific models |
| AAC | Optimal. | Medium/Low | iOS, Android |
As you can see from the table, the delay parameter is critical to watching video, so if your transmitter and headphones only support the basic SBC codec, the delay can be noticeable to the eye, in which case it is better to use the device only for listening to music or podcasts where synchronization with the video sequence is not required.
You can check codec support in the device specification or through special Android apps such as Bluetooth Codec Checker, which will allow you to understand exactly what sound quality you can expect in conjunction with your specific headphones.
Troubleshooting and frequent problems
Even when properly set up, there can be disruptions, and one of the most common problems is intermittent sound or frequent connection breaks, which is often associated with radio interference, especially when powerful sources of radiation are working nearby, such as Wi-Fi routers or microwave ovens.
Another common situation is that the device can't see the headphones or vice versa, in which case a complete reset of the paired devices helps, you need to find in the memory of the transmitter a list of previously connected gadgets and delete them, or reset to the factory settings, and then conduct the search again.
What do you do if there's no sound?
⚠️ Note: When using an optical cable, make sure you remove plastic plugs from both ends of the cable before connecting, otherwise the signal will not pass through the light guide.
If there is a strong background hissing interference, try to push the transmitter power cable away from the audio cable.Tips from the charging wire often create an unpleasant high-frequency hum, which is especially heard in pauses between tracks.
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The stability of the connection depends on the distance: for confident reception without loss of quality, try not to move away from the transmitter more than 10 meters in line of sight.
Features of working with different versions of the software
Although Xiaomi transmitters are hardware solutions, their work may depend on the firmware of internal chips. In rare cases, manufacturers release updates to eliminate compatibility bugs with new versions of Android or iOS. You can usually check the version of the software through the Mi Home app, if the device supports such a connection, or through specialized snails for CSR or Realtek chips.
Users should be aware that switching between sources (e.g. from TV to phone) may require manual reconnection. Automatic switching between multiple active input sources is not supported by all models. If priority is not set, the device may continue to broadcast sound from the last active port.
To extend the battery life (in standalone models), it is recommended to turn off the device after use. Left in search mode Bluetooth module can discharge in a few hours, which reduces the total battery life.