The Sennheiser RS 175 is a digital wireless headphone system designed to enhance home entertainment experiences, offering an impressive array of features within a compact and ergonomic package. This system allows users to fully enjoy music and television with exceptional digital audio clarity and a wide transmission range.
Function Description:
The RS 175 system consists of HDR 175 headphones and a TR 175 transmitter. It provides high-quality digital wireless audio transmission, allowing users to move freely within a range of up to 328 feet (100 meters) line of sight without signal degradation. The system supports both analog and digital audio inputs, enabling connection to various audio sources such as hi-fi systems, TV sets, and home cinema systems. A key feature is the ability to toggle between these inputs using a dedicated switch on the transmitter.
The headphones offer two distinct listening modes: Bass Boost and Virtual Surround Sound. The Bass Boost mode enhances the audio bass response, providing a more impactful low-frequency experience. The Virtual Surround Sound modes (low and high) create a more spatial and lively stereo sound, immersing the listener further into their audio content. These modes can be activated or deactivated directly from the headphones.
The TR 175 transmitter serves multiple purposes: it transmits the audio signal wirelessly to the headphones, acts as an "easy-charge" cradle for the headphones, and functions as a docking station. The system supports multi-receiver transmission, meaning the transmitter can simultaneously support up to two pairs of headphones.
Important Technical Specifications:
- Headphone Type: Closed, circumaural
- Transmission Technology: Digital wireless
- Transmission Range: Up to 328 ft (100 m) line of sight
- Audio Inputs (Transmitter):
- Digital Optical In (DIGITAL OPTICAL IN)
- Analog 3.5 mm jack (ANALOG 3.5 mm IN)
- Power Supply (Transmitter): DC 9V 0.3A via supplied power supply unit with multi-country adapters (EU, UK, US, AU)
- Headphone Batteries: Low self-discharge NiMH rechargeable batteries, AAA size
- Operating Temperature: 0 to 40 °C (32 to 104 °F)
- Audio Output (Digital): Supports PCM audio output; other formats like Bitstream may require adjustment on the audio source.
Usage Features:
- User-Friendly Design: Main controls are conveniently located on the headphones for easy access during use.
- Easy Setup: The system is designed for straightforward setup. Users need to choose a suitable place for the transmitter near their audio source, ensuring it's at least 50 cm (20 inches) away from other wireless devices to avoid interference and not too close to metal objects that could reduce range.
- Audio Source Connection:
- Optical (Digital): Recommended for the best listening experience, using the supplied optical digital cable. Requires the audio source to output PCM audio.
- 3.5 mm or 6.3 mm/¼" Jack (Analog): Connects via a stereo audio cable (and an optional 6.3 mm adapter). Users should check if their TV mutes loudspeakers when headphones are connected and adjust TV settings if necessary. It's recommended to adjust the volume of the headphone socket on the audio source to at least a middle level.
- RCA (Analog): Connects via a stereo audio cable with an RCA adapter to the "AUDIO OUT" RCA outputs of the audio source.
- Power Management:
- The transmitter connects to an AC wall outlet using the supplied power supply unit.
- The headphones use rechargeable AAA NiMH batteries. These batteries are inserted into compartments within the ear cups.
- The headphones charge by placing them on the transmitter's docking station.
- LED indicators on both the headphones and transmitter provide clear status updates on power, connection, charging, battery level, and active listening modes.
- Headphone Controls:
- HDR Power Button: To switch the headphones on/off.
- Volume +/- Buttons: To adjust the listening volume.
- SURR Virtual Surround Sound Button: To activate/deactivate and cycle through low/high virtual surround sound modes.
- BASS Button: To activate/deactivate the dynamic bass boost.
- Transmitter Controls:
- Input Selection Switch: To toggle between connected analog and digital audio inputs.
- BASS Button: To activate/deactivate dynamic bass boost (with LED indicator).
- SURR Virtual Surround Sound Button: To activate/deactivate virtual surround sound (with LED indicators for low and high modes).
- Automatic Dimming: LED indicators on the headphones automatically dim after approximately 30 seconds of inactivity to minimize disturbance.
- Battery Status Indicators: The charge status LED on the transmitter provides an approximate operating time based on battery capacity (0-25%, 25-50%, 50-75%, 75-100%).
- Pairing: The system supports pairing one or several headphones to the transmitter.
- Safety: Important safety information is provided, including warnings about high volume levels, magnetic fields (pacemakers), choking hazards, and proper battery handling.
Maintenance Features:
- Battery Replacement: Instructions are provided for inserting and replacing the rechargeable batteries in the headphones.
- Charging: The headphones are charged by placing them on the transmitter. The charge status LED on the transmitter indicates charging progress and completion.
- Cleaning: The product should only be cleaned with a soft, dry cloth.
- Ear Pad Replacement: The ear pads are replaceable, ensuring long-term comfort and hygiene.
- Storage: When not in use for extended periods, it is recommended to unplug the power supply unit from the AC wall outlet and remove standard/rechargeable batteries from the product.
- Troubleshooting: The manual includes sections for troubleshooting common sound and other problems, as well as instructions for clearing pair settings on the headphones.
- Product Care: Users are advised to keep the product dry, avoid extreme temperatures, and not place headphones on objects that could widen the headband and reduce contact pressure. The transmitter should be placed on a non-slip pad to prevent staining furniture.
- Accessory Use: Only attachments, accessories, and spare parts supplied or recommended by Sennheiser should be used.
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