Sennheiser HDR 175 – Wireless Over Ear TV Headset Headphones

Sennheiser HDR 175 – Wireless TV Headset Headphones

The Sennheiser HDR 175 wireless over-ear closed back headphones are available as a single stand alone headset specifically made to work in conjunction with the Sennheiser TR 175 transmitter. When you need more than one pair of headphones, purchase one RS 175-U system, which includes a single TR 175 transmitter and a single HDR 175 headset, and then one additional HDR 175 headset so 2 people can listen.

• Wireless, over-ear, closed circumaural headphone system
• Dynamic transducer with neodymium magnets
• Frequency response: 17 Hz – 22,000 Hz
• Digital 2.4 GHz wireless (8-FSK modulation), up to 100 m range
• Dynamic bass boost and two virtual surround sound modes (LO/HI)
• Battery: 2 × AAA NiMH rechargeable (1.2 V, 820 mAh), up to 18 hours operating time
• Weight: 310 g (incl. batteries)
• 2 Year Warranty

Highlights & Key Technologies

Battery & Charging
The HDR 175 headphones are powered by two low self-discharge NiMH rechargeable batteries (AAA size, 1.2 V, 820 mAh) providing up to 18 hours of operating time. A complete charging cycle takes about 8.5 hours. Before first use, charge the batteries for at least 16 hours without interruption to optimize performance; the first charging cycle takes longer because it is used to determine the maximum capacity of the batteries. The intelligent battery charging technology charges the batteries both effectively and gently and prevents overcharging. When not in use, place the headphones on the transmitter's headphone holder to keep the batteries charged. When the batteries are almost empty, the HDR status LED lights red and you hear beeps in the headphones; the headphones switch off after a few minutes. When you remove the headphones from the holder, the Charge status LED on the transmitter indicates approximate operating time: green flashing patterns indicate capacity from 0–25% (up to 4 hours) through 75–100% (approx. 14 to 18 hours). Standard non-rechargeable AAA batteries (1.5 V) can also be used, but must not be placed on the transmitter's charging contacts.

Volume & Controls
The HDR 175 headphones feature Volume + and Volume – buttons on the ear cup for independent volume adjustment. When the minimum or maximum volume is reached, you hear a beep. The Power HDR button switches the headphones on (press for approx. 2 seconds) and off (press for approx. 2 seconds), and also serves as a mute toggle during use (single press to mute, press again or press a Volume button to unmute). If muted for more than 15 minutes, the headphones switch off automatically. If there is no audio signal from the transmitter for more than 5 minutes, the headphones also switch off automatically. Volume is adjusted to a low level before toggling between audio inputs to prevent hearing damage from sudden volume jumps.

Comfort & Design
The HDR 175 headphones feature a closed, circumaural (over-ear) design with an adjustable headband and snap-in locking mechanism for easy adjustment. The ear pads are replaceable by twisting counterclockwise to remove and clockwise to lock in place, with L (left) and R (right) markings for correct orientation. The headband padding is replaceable through the repair service. The ergonomic design ensures excellent wearing comfort for hours of use.

Details & Specifications

MODEL INFORMATION
Headphones model: HDR 175
System model: RS 175 (RS 175-U), sold separately
Transmitter model: TR 175, sold separately
Article number (SKU): 505582

HEADPHONE – AUDIO PERFORMANCE
Transducer principle: Dynamic, neodymium magnets
Type: Circumaural, closed
Frequency response: 17 Hz to 22 kHz
Max. SPL: 114 dB at 1 kHz, 3% THD (product page: 114 dB (1kHz, 100 dB))
Total harmonic distortion: < 0.5% at 1 kHz, 100 dB SPL
Magnetic field strength: 2.7 mT

WIRELESS
Transmission frequency: 2,406 to 2,474 MHz
Modulation: 8-FSK Digital
Signal-to-noise ratio: Analog input: typ. 85 dBA at 1 Vrms; Digital input: > 90 dBA
RF output power: Max. 10 dBm
Range: Up to 100 m (free line of sight)
Maximum simultaneously connected headphones: 2

BATTERY
Power supply / Battery type: 2 × low self-discharge NiMH rechargeable batteries, AAA size, 1.2 V, 820 mAh
Operating time: Up to 18 hours
Charging time: Up to 8.5 hours (first charge: at least 16 hours)

PHYSICAL SPECIFICATIONS
Headphones dimensions (W × H × D): Approx. 17 cm × 20 cm × 9.5 cm
Headphones weight (incl. batteries): Approx. 310 g

ENVIRONMENTAL
Operating temperature: 0°C to +40°C
Storage temperature: –25°C to +70°C
Operating relative humidity: 10% to 80% (non-condensing)
Storage relative humidity: 10% to 90%

INCLUDED ACCESSORIES
HDR 175 headphones
2 × low self-discharge NiMH rechargeable batteries (AAA size)
Quick guide / Safety guide