About Us

TV headphones are designed specifically for long-form watching, giving you a fully immersive audio experience without disturbing others in the room. Unlike regular headphones, they combine a dedicated feature set tailored for TV use —stable long-range transmission, clear speech enhancement, low-latency audio for perfect lip-sync, and easy plug-and-play
connectivity. This combination ensures you can enjoy your content in high quality and complete comfort while keeping the environment around you quiet.

• Virtual Surround Sound – Creates a spacious, cinema-like listening experience.

• Speech Clarity – Enhances dialogue so voices are easier to understand.

• Hearing Profiles – Tailor the sound to your individual hearing needs.

• Perfect Lip-Sync – Low-latency audio keeps sound and picture seamlessly aligned.

• Reliable Connection for up to 50m – Stable, long-range performance optimized for TV viewing.

• Up to 50 Hours Battery Life – Enjoy multiple viewing sessions without recharging.

• All-Day Comfort – Lightweight design and soft ear cushions ensure enjoyable long-form viewing.

• Multi-Connectivity via Bluetooth Classic – The Headphones connect effortlessly to TVs, tablets, mobile phones and other Bluetooth devices

• Auracast™ Broadcast Support – Transmit audio to an unlimited number of Auracast-enabled headphones for shared or group listening.

The maximum volume depends on how you use the headphones.

When connected via Bluetooth Classic (for example to a smartphone or tablet), the headphones follow the standard Bluetooth output limit of up to 100 dB. However, when paired with the BTA1 TV Transmitter, the system can deliver up to 106 dB.

This is a significant increase, because sound pressure does not rise in a linear way, the decibel scale is exponential. That means 106 dB feels noticeably louder than 100 dB, providing plenty of headroom for users who need higher volume levels.

• Hearing Profiles – Choose from four optimized profiles tailored to common hearing challenges, helping you find the sound that fits your personal needs and preferences.Everyone hears a little differently, some people struggle with soft voices, others have trouble with high-pitched sounds, and some need loud sounds made gentler. Hearing profiles help fix that.

• Noise Suppression – Reduces distracting background information by blending stereo into mono, making dialogue clearer and easier to follow.

• Speech Clarity – Enhances voices and boosts dialogue presence while keeping full stereo sound, ensuring improved intelligibility without losing the immersive experience.

• High Maximum Volume (up to 106 dB) – Provides extra volume headroom when used with the transmitter, supporting users who require higher listening levels.

• Left/Right Balance Control – Adjust the audio levels for each ear individually to match your personal listening preference

Yes, absolutely.
The headphones work perfectly fine right out of the box—no app required.

However, the app unlocks several valuable additional features, including:

• Hearing profiles
• Noise suppression
• Left/right balance adjustment
• Privacy encryption settings
• Additional customization options

The app is also essential for keeping both the headphones and the transmitter up to date, as firmware updates can only be installed through the app.

So, while the headphones work on their own, the app provides the full feature set and the best possible experience.

Yes, you can choose either option.

• Private listening:
You can mute the TV speakers and listen only through your headphones. In this mode, you control the volume directly on the headphones, so you can watch without disturbing anyone else.

• Shared listening :
You can also leave the TV speakers on. In this case, the TV speaker volume and the headphone volume are completely independent, so others can listen at their preferred level while you adjust your’s freely.

This flexibility makes the system ideal for both solo viewing and watching together. If the TV speakers won’t stay on, have a look at the troubleshooting guidance under 9.3.

In the bundle of the RS 275 TV Headphones also a Headphone Stand is included.

Yes, supplemental headphones (= HDR 275 TV Headphones) are available in the accessories section. Please note that for the best possible TV experience, we recommend using the headphones with the included transmitter. Supplemental headphones are ideal if you want to connect multiple headphones to a single transmitter.

1. Turn on your TV. It needs to be powered on before you start.
2. Power the transmitter. Connect it to your TV (or another USB power source) using the USB-C to USB-A cable.
3. Connect the audio. Use the optical cable to link the transmitter’s Optical In to your TV’s Optical Out.
4. No optical output? Use the included analog cable or your own HDMI cable, depending on what your TV supports.

• Make sure the TV transmitter is powered on and receiving an audio signal.
The Source LED should be solid (not blinking) and may appear blue, white, or orange depending on the audio source.
• Then follow the pairing instructions for your headphones. Usually done through their app or Bluetooth settings

1. Connect the transmitter to your TV (power + audio) as shown in the instructions under 2.1 before.
2. Turn on the headphones using the power button.
3. Wait 5–8 seconds. Both devices will automatically search for each other and pair.
4. Listen for the voice prompt “Connected” to confirm a successful connection.
5. If the connection fails, please have a look at the trouble shooting linked here.

1. Connect your headphones: Make sure your headphones are paired with your smartphone via Bluetooth.
2. Install and open the app: Download and open the Sennheiser Smart Control Plus app on your smartphone.
3. Access Auracast: Go to the My Device tab and look for the Auracast tile. Tap it to open the assistant and manage your connection
4. Select a transmitter: You can choose the desired transmitter from the list.
5. Encrypted streams: If a stream password has been set (recommended), a lock symbol is displayed on each encrypted stream.

The RS 275 TV Headphones will automatically connect to the first previously known BTA1 TV transmitter. To switch to a different transmitter, use the Auracast™ assistant in the Sennheiser Smart Control Plus App

You can connect to the BTA1 TV Transmitter using any other available audio output on your TV. Make sure to select the correct output in your TV’s audio settings. Some TV and soundbar combinations automatically prioritize the HDMI-ARC connection. If this happens, we recommend connecting the TV transmitter to the HDMI-ARC port and the soundbar to the digital optical output.

Most PCs can be connected using either a USB cable or a 3.5 mm analog audio cable. Your computer will recognize the TV Transmitter as an additional audio device. Alternatively, you can connect the headphones directly to your PC via Bluetooth

You can connect the transmitter to your AV receiver using one of the following methods:
• Digital Audio (Recommended)
• Use an Optical Toslink cable to connect the AV receiver’s Optical Out to the
transmitter’s Optical In.
• Analog Audio
• Use a 3.5 mm analog audio cable from the transmitter to the AV receiver’s
headphone output or analog audio output.

If your AV receiver uses RCA outputs. Some receivers only provide red/white RCA audio
outputs. In this case, you will need an RCA-to-3.5 mm converter, which can be purchased separately.

Each transmitter uses Frequency Hopping Spread Spectrum (FHSS) technology to ensure coexistence with Wi-Fi and other Bluetooth devices. In practical terms, around 10 to 20 transmitters can be used in parallel without any noticeable interference or audio glitches.

In theory, an unlimited number of Auracast™ headphones can be connected to a single TV
Transmitter. In practical use, one transmitter can typically support between 200 and 500
headphones while maintaining good performance.

No, only Auracast™ capable headphones are compatible with the BTA1 TV Transmitter.

Yes, the RS 275 TV Headphones are compatible with virtually any TV. The package includes a digital optical (Toslink) cable and a 3.5 mm analog audio cable (AUX cable), allowing you to connect to the most common audio outputs. The BTA1 TV Transmitter also features an HDMI-ARC port for TVs that support it, but please note that an HDMI-ARC cable is not included.

The range is up to 50 meters. Actual performance may vary depending on your
environment—for example, obstacles such as walls or furniture, as well as crowded wireless conditions, can reduce the effective range.

The BTA1 TV transmitter is certified to the HDMI 1.4b standard, including ARC capabilities. TVs with HDMI 1.4b certification or higher are compatible.

• Speech Clarity – Enhances vocal frequencies to make spoken words easier to understand in dialogue, podcasts, calls, or videos. 
• Hearing Profiles – Choose from four optimized profiles tailored to common hearing challenges, helping you find the sound that fits your personal needs and preferences.  
• Noise Suppression – Reduces background sounds such as hums, fans, or ambient noise to create a cleaner audio signal. 
• L/R Balance – Lets you shift the audio level between left and right channels to match your preferred stereo balance. 
• Mono Downmix – Combines stereo channels into a single mono signal so all audio content is equally audible from both sides. 
• Equalizer – Allows you to adjust specific frequency bands (bass, mids, treble) to shape the sound to your liking. 

The transmitter sound modes adjust the audio for everyone connected, shaping the overall sound for all listeners. For example, you can choose Virtual Surround Sound for an immersive experience, Speech Clarity to emphasize dialogue, or a Combination Mode that blends both. 

In contrast, the headphone modes let each listener personalize their own sound without affecting others. Through the app, you can fine-tune your experience with hearing profiles, equalizer adjustments, speech clarity, noise suppression, and other features to make the sound comfortable and clear for you personally. 

This feature makes dialogue easier to hear by emphasizing the frequency ranges of human speech. It uses an equalizer to boost the parts of the audio where voices are most prominent, while keeping the overall sound balanced and immersive, so you still enjoy the full richness of music, effects, and ambience.

When using USB-C Audio, the connection is focused on PC audio, where extra processing may not be needed. For this reason,sound modes and digital signal processing are bypassed in this mode.

If the sound doesn’t feel quite right, try these steps: 

1. Adjust the volume directly on your headphones to your preferred level. 
2. If needed, tweak the TV’s volume as well. 
3. Open the audio settings of your TV and make sure that the “audio volume” is set at 80% 
4. Open the app and check the TV Transmitter’s “Normalize Volume” setting. Turn it on or off to see which gives the best level. 

The HDR275 headphones canconnect to a variety of devices, such as mobile phones, tablets, or computers, using Bluetooth Classic. This allows you to use them not only with your TV but also for listening to music, making phone calls, or other audio applications, just like any regular Bluetooth headphones..

You can enjoy up to 50 hours of playback time on a full charge. Actual battery life may vary depending on volume, enabled features, and the connected device (e.g., iPhone, Android phone, PC, or TV transmitter).

The headphones can provide up to 50 hours of playback, but actual battery life depends on volume, enabled features, and the connected device (e.g., iPhone, Android phone, PC, or TV transmitter).  

If you’ve had your headphones for a few years, the battery may naturally hold less charge over time. No worries: the batteries of HDR 275 TV Headphones are replaceable, so you can easily refresh your headphones – click here for more info. 

The headphones take about 2 hours to fully charge when using a charger at full capacity.

TV Transmitter: 

• If one or more LEDs are lit, the transmitter is switched on. 
• If no LEDs are lit, ensure the transmitter is connected to power and your TV is on. Press any button on the transmitter to wake it up. 

Headphones: 

• Shortly press the on/off button. If the LED flashes white, the headphones are now on. 
• If nothing happens or the LED turns purple, the headphones are already on. 
• If you still cannot hear audio, make sure the headphones are charged. 

For resolving connection problems see Chapter 9.1 

Yes. If your USB power adapter doesn’t provide enough power, your headphones will simply charge more slowly. 

 The good news: Almost all modern phone, tablet, and laptop chargers provide more than enough power for full-speed charging. 

Minimum requirements: 

Current: at least 400 mA (0.4 A) 

Voltage: between 5.0 V and 5.5 V 

Examples of compatible chargers: 

5.1 V, 1500 mA (1.5 A) 

5.0 V, 2 A 

5.0 V, 1.2 A 

5.0 V, 1 A 

5.2–5.3 V, 2 A 

5 V, 4.5 A 

All of these meet the requirements because they can supply more than 0.4 A and stay within the 5.0–5.5 V range. 

Yes, but with a limitation: 

The USB-C output provides less than 500 mA of current, so not all devices will charge properly or at all. 

It works best for low-power devices, like headphones or small accessories, but smartphones or tablets may charge very slowly or not at all. 

To check the battery level, double-press the on/off button. The headphones will thenindicatethe current charge level.

You can safely leave your headphones charging overnight, as charging automatically stops when the battery is full. However,avoid storing the headphones for long periods with acompletely depleted battery, as this can affect battery health over time.

The battery model is called BA 275 and can be bought on our accessories webpage.

No, the headphone stand is for storage only.Charging is done via the USB cable, which provides a convenient and reliable way to power up your headphones.

Several factors can affect charging: 

• Changed USB port: If you switched the USB port on the TV transmitter, it might provide less power. Try using the original port or power adapter. 
• Deeply discharged battery: If the headphones were fully drained, charging may take longer than usual. 
• Aging battery: Older batteries may charge slower and reduce runtime. Consider replacing the battery if needed. 
• Charging cable: Using a different cable can affect charging. Try using the provided USB cable. 

Bluetooth Auracast™ allows you to broadcast audio from your TV or other devices to multiple headphones or earbuds at the same time, making it perfect for shared listening. In contrast, Bluetooth Classic connects only one device at a time, which is ideal for personal use like listening to music or making calls. 

For more details, you can read here an article about  Auracast™. 

In theory, an unlimited number ofAuracast™ headphones can be connected to a single TV Transmitter/Auracast™ stream. In practical use, one transmitter can typically support between 200 and 500 headphones whilemaintaininggood performance.

You can connect any headphones or earbuds that support Bluetooth Auracast™. Standard Bluetooth Classic headphones will not work with the Auracast™ broadcast.

The TV transmitter automatically starts broadcasting as soon as it is powered on. You can verify that audio is being transmitted by checking the SOURCE LED on the transmitter—if it is steadily lit (not blinking), the audio stream is active.

You can rename your Auracast™ stream using the Smart Control Plus app.Simply connect your transmitter with the app and update the name in the Broadcast Settings menu. The name you choose will appear in your Auracast™assistant, making it easier to identify your stream. Especially when multiple broadcasts are available nearby.

You can enable stream encryption through the Smart Control Plus app.Simply connect your transmitter with the app, go to the Broadcast Settings menu,and activate  encryption, then set a password. The security of your stream depends on the strength of the chosen password. The Smart Control Plus app also includes a function to generate a strong, random password for increased protection. 

While encryption improves privacy, the Auracast™ password is not unbreakable, and absolute security cannot be guaranteed against offline brute-force attempts to recover the key. 

Yes, provided your hearing aids support Auracast™. Also, please note that the TV transmitter’s Auracast™ stream is set by default to high quality with a 48 kHz sampling rate. Some Auracast devices, including certain hearing aids, may not support this setting. By using the Smart Control Plus app, you can select a lower sampling rate to ensure full compatibility with anyAuracast-enabled device.

• With the TV Transmitter (Auracast™): Up to 50 meters 
• With Bluetooth Classic: Up to 25 meters 

Actual range may vary depending on your environment—for example, walls, furniture, or crowded wireless conditions can reduce the effective distance.

No, a single transmitter can only stream one audio source at a time. 

However, you can use multiple TV transmitters to stream different sources simultaneously. 

The system latency is approximately 50 ms. 

Latency is the small delay between when an audio signal enters the system and when you actually hear the sound. For most users, 50 ms is low enough that it shouldn’t be noticeable. Audio and video should remain in sync during normal TV viewing. 

Yes! The headphones can connect to any mobile phone that supports Bluetooth Classic, allowing you to listen to music, watch videos, or make phone calls.

Yes, if your Bluetooth loudspeaker supports Auracast, you can connect it to BTA1 using the user interface of the speaker. 

Yes! The headphones support phone calls when connected to a mobile device via Bluetooth Classic, so you can talk hands-free while enjoying your audio.

Yes, the headphones support the following codecs: 

• SBC 
• AAC 
• AptX 
• AptX Adaptive 
• LC3 

Important: The TV transmitter only uses Bluetooth Low Energy (LE) audio with the LC3 codec, so when connected to the transmitter, only LC3 will be used. 

• Additional receiver (=HDR 275 TV Headphones)  
• Earpads 
• Replaceable battery  
• Headphone Stand 

Firmware updated can be downloaded free of charge from the Internet using the Sennheiser Smart Control Plus app. For more details, please have a look at the manual “Installing firmware updates”.

Firmware updated can be downloaded free of charge from the Internet using the Sennheiser Smart Control Plus app. For more details, please have a look at the manual “Installing firmware updates” .

• Press and hold the middle button (between the volume buttons) for approximately 15 seconds 
• The status LED will flash red once 
• You will hear the power-on sound, confirming the factory reset is complete 

You can control the headphones in several ways: 

• On the headphones: Use the physical buttons for functions like play, pause, volume up, and volume down. 
• Smart Control Plus app: Offers additional settings and controls. 
• Smartphone media controls: Some functions (play, pause, volume) can also be managed directly from your phone. 

The transmitter has two buttons: 

• Change source: Switch between different audio inputs. 
• Sound mode: Cycle through three sound modes or turn sound off completely. 

For additional settings and more convenient control, you can also use the Smart Control Plus app. 

The Sennheiser Smart Control Plus app gives you full control over your headphones and transmitter. Three key benefits as examples: 

• Firmware updates – keep your headphones and transmitter up to date with the latest features and improvements. 
• Personalized hearing enhancements – adjust hearing profiles, noise suppression, and left/right balance (available only in the app). 
• Secure Auracast streaming – enable encryption for your audio streams. 

The app ensures you get the best performance, personalized experience, and latest features from your devices. 

1. Activate Bluetooth on your smartphone, where the Smart Control Plus app is installed. 
2. On the TV transmitter, simultaneously press and hold the SOURCE and SOUND MODE buttons for 5 seconds. The SOURCE LED will start flashing green, indicating the transmitter is ready to connect. 
3. Open the Smart Control Plus app on your smartphone, tap the “+” icon on the start screen to add a new device, and select the TV transmitter from the list. 
4. If your smartphone prompts you to allow pairing with a new device, approve the connection. 
5. Once pairing is successful, the TV transmitter will appear in the list of connected devices. Select “BTA1 TV Transmitter” to complete the connection.

The TV transmitter connects to your smartphone only to configure settings through the Smart Control Plus app. A standard Bluetooth connection, like the one used for headphones, is not required and therefore is not supported for this purpose

The TV transmitter connects to Smart Control Plus using Bluetooth Low Energy (BLE). On most smartphones, BLE connections may be limited or paused when an app is closed or running in the background. This is normal behavior designed to save battery and system resources. 

As a result, the transmitter may appear disconnected when the app is not active. Once you reopen the app, it will automatically attempt to restore the connection. To maintain an active connection, keep the Smart Control Plus app open and running in the foreground. 

Step 1: Pair with your smartphone via Bluetooth

• Make sure no TV transmitter is nearby or powered on (the headphones may automatically connect to it during pairing). 
• Press and hold the on/off button on the headphones for about 5 seconds. 
• The headphones are in pairing mode when the LED flashes blue and white alternately. 
• On your smartphone: Go to Bluetooth settings // Enable Bluetooth // Search for a new device named “HDR 275” // Select it and accept/connect if prompted 

Step 2: Connect via the Smart Control Plus app 

• Open the Smart Control Plus app. 
• Your headphones (HDR 275) should be automatically detected. 
• If not, tap the * symbol in the upper left corner to search for connected devices. 
• Select HDR 275 from the list to connect. 

Yes, you can use the TV Headphones with your PC or laptop. There are different ways you can connect: 

• TV Headphones directly connected over USB to your laptop/PC 
• TV Headphones connected via Bluetooth classic to your laptop/PC 
• TV Transmitter connected via USB to your laptop/PC, streaming Auracast to the TV Headphones 

Please note that the connection via the TV Transmitter does not support an audio return channel; therefore, telephony functionality is not available in this configuration. 

Try the following steps: 

1. Make sure the TV transmitter is powered on and receiving an audio signal. You can confirm this by checking that the Source LED is solid blue, orange, or white (not blinking). 
2. Check the cable connections between the transmitter and your TV. 
3. Ensure the TV is actually playing audio. 
4. Make sure the headphones are powered on. 
5. If the Source LED is blinking, please check the TV settings and make sure that the correct audio output is selected.  

If they still don’t connect: Re-pair the headphones: 

1. Press and hold the on/off button for about 5 seconds until the LED flashes blue and white alternately. 
2. If the transmitter is streaming and the headphones are nearby, they should automatically reconnect. 

The sound from the transmitter is independent of the TV speakers. If you want to hear audio only through the headphones, simply: 

1. Mute the TV speakers, or 
2. Turn the TV volume down to 0 

The headphones will continue to receive audio normally regardless of the TV’s speaker volume settings.

To play audio through both the TV speakers and the headphones: 

• Use the TV’s digital audio output (Optical/Toslink) if available. Many TVs allow the optical output to stay active while the TV speakers remain on, enabling dual audio. 
• Check your TV audio settings for options like: 
• “TV speakers + Optical out” 
• “Audio output: TV + external device” 
• “Multi-output audio” 

If your TV does not offer this feature, it may not be possible to play sound from both outputs simultaneously. 

This happens because both the TV speakers and the headphones are playing sound at the same time, and the headphones have a slight audio delay. The two signals overlap, creating an echo or reverb effect. 

To fix this, we recommend to mute the TV speakers (or reduce the TV volume to 0) so the sound comes only from the headphones. 

Try the following steps: 

• Increase the volume on the headphones by pressing the volume-up button several times. 
• In the Smart Control Plus app, check the transmitter settings: Ensure “Normalize Volume” is set to “Slow” or “Fast.” (not off) 
• Go to your TV’s audio settings and set the TV volume to around 60–80% to provide a strong audio signal to the transmitter. 

The audio sent to the headphones has a small delay of about 50 ms. In most cases, this delay is so small that it’s not noticeable. 

If you do notice it: Many TVs offer audio delay / lip-sync settings that allow you to adjust the timing so the sound matches the picture more closely. 

Try the following steps: 

1. Power cycle the TV transmitter: turn it off, wait a few seconds, then turn it back on. 
2. Factory reset both devices: perform a factory reset on the TV transmitter and the headphones. 

This usually resolves unexpected issues and restores normal operation. 

Try the following steps: 

• Turn the headphones off and on to reset the connection. 
• Move closer to the TV transmitter to improve signal strength. 
• Reduce interference by keeping other wireless devices (Wi-Fi routers, cordless phones, smartphones, or other Bluetooth devices) away from the transmitter and headphones. 

Move or turn off other wireless devices near the headphones and TV transmitter, such as: 

• Wi-Fi routers 
• Cordless phones 
• Smartphones 
• Other Bluetooth devices 

Reducing nearby wireless signals can improve the connection and reduce interference. 

Some TVs prioritize HDMI-ARC as the default audio output over other connections. Additionally, certain soundbars connected via HDMI-ARC may automatically override the TV’s audio output settings. 

A possible workaround is to connect the TV transmitter via HDMI-ARC and your other device via the optical output. In most cases, the BTA1 TV Transmitter only follows the HDMI output if it is actively in use.

The transmitter automatically detects when a cable is connected to the analog input and switches to this input, indicatedby a solid blue SOURCE LED. If the cable is not connected at the other end, the transmitter may detect environmental noise as an audio signal, which can result in streaming static or unintended sound.

Some USB controllers can cause audio quality issues, such as noise orstatic. To resolve this, try connecting the transmitter to a different USB port or directly to the device, bypassing hubs or docking stations if possible.

A red SOURCE LED indicates an unknown or unsupported audio codec on the optical input. This can happen if the optical output is not selected as the TV’s audio output. 

• If you are using the TV transmitter and the optical output is selected, change your TV’s audio codec to a supported format (e.g., Dolby Digital). 
• If another device, such as a soundbar, is currently using a different TV output, you can ignore the red LED. It simply indicates that no valid audio signal is present on the optical connection.