Personal Audio
Set 840 S - Sennheiser USA
Article No. 502011
Key Features
- Freedom of movement
- RF TV listening system
- Individual treble emphasis
- Ideal for wearers of hearing aids
TV listening system - Wireless Listening System
$299.95
Related product
$299.95
General Description
Set 840 S is a RF stereo TV listening system and is especially suited for those who wear hearing aids. Easily connected to a TV, hi-fi system or radio, Set 840 S produces excellent sound, delivered directly to your ears.
The sound is transmitted from the receiver to the hearing aid via wireless induction over the induction loop that is included in the scope of delivery. Alternatively, you can connect headphones or induction couplers to the lightweight clip-on receiver.
Features
- Receiver is ideal for connection to hearing aids and headphones (3.5 mm stereo jack plug)
- Easy to set up and operate
- Wireless mobility within a range of up to 100 m
- Transmits even through walls
- Ideal for plasma TVs
- Excellent individual stereo sound
- Three selectable hearing settings on the transmitter: optimized speech intelligibility due to switchable compression and treble emphasis
- Treble emphasis can be set individually
- Large, ergonomic volume control on the receiver
- Balance control on the receiver for setting the volume for the right and left ears
- Lithium polymer battery technology ensures a long operating time of up to 9 hours
- Receiver can be placed in the transmitter’s charging compartment facing in either direction
- Three selectable transmission channels on the transmitter for optimum reception
- Auto-tuning – automatic channel search tuning can be activated on the receiver
- Integrated charging compartment in transmitter for spare battery
Delivery Includes
- RR 840 S receiver with removable clip
- TR 840 transmitter
- EZT 3011 induction loop
- Lanyard
- BA 300 battery
- Power supply with national adapters for EU, UK
- TV RCA adapter
- TV SCART adapter
- TV connection cable with two 3.5 mm stereo jack plugs and one adapter to ¼“ (6.3 mm) jack socket
- MKE 800 TV N external mic
$299.95
Technical Data
| Modulation | FM, stereo |
| Carrier frequency | 925.95 / 926.8 / 927.5 MHz |
| Range | up to 100 m |
| Frequency response | 50 - 16,000 Hz |
| Total harmonic distortion (THD) | <1% (1kHz) |
| Sound pressure level (SPL) | 125 dB |
| Signal-to-noise-ratio | typ. 70 dB(A) |
| Operating time (receiver) | up to 9 hrs |
| Charging time | approx. 3 hrs |
| Weight (receiver) | approx 1.8 oz (50 g) (incl. accu) |
| Weight (transmitter) | approx. 8.8 oz (250 g) |
| Dimensions (receiver) | 2.8 x 2.4 x 1 in (70 x 60 x 26 mm) |
| Dimensions (transmitter) | 4.4 x 5.7 x 2.3 in (112 x 146 x 58 mm) |
| Audio-XLR connector | 3.5 mm, stereo jack plug |
| Microphone connector | 3.5 mm, same plug as Audio-XLR connector |
$299.95
Recommended Accessories
| Part/Accessory | Article No. |
| EZT 3011 | 502566 |
|
Induction neck loop for use with the RR 840 S and RI 830 S receivers. It transmits the audio signal from the receiver to hearing aids with induction coils. |
|
| EZT 3012 | 504061 |
|
Induction neck loop for use with most Sennheiser bodypack receivers |
|
| RR 840 S | 502026 |
|
The RR 840 S is designed for wireless reception of TV sound and music transmitted by the TR 840 RF stereo transmitter. The sound can be set individually. Delivery includes 1 BA 300 rechargeable battery, 1 attachment clip and 1 lanyard. |
|
Glossary
| Audio-XLR connector |
| The most common connector for connecting microphones to amplifiers or mixing consoles or for linking audio units in the studio (usually 3-pin XLR connectors). XLR-3 connectors are also used for digital audio signals (AES/EBU). In addition to audio applications, multi-pin XLR connectors are used for supplying power to e.g. ENG cameras. |
| Charging time |
| The time required to recharge a Sennheiser accupack. After recharging, automatic chargers will automatically switch to trickle charging. |
| Frequency response |
| The frequency response of a microphone is given within the limits defined by the manufacturer. In studio condenser microphones it is generally within the range of between 20 Hz and 20 kHz. |
| Microphone connector |
| Standardised socket for connecting a microphone (such as the microphone socket on an RF wireless transmitter) or connector of a cabled microphone (such as the XLR connector on most of Sennheiser’s cabled dynamic microphones). |
| Modulation |
| The process in which one wave is varied by some parameter of another wave, for example, an RF carrier frequency that is modulated by an audio signal. Types of modulation include amplitude modulation, frequency modulation, pulse code modulation and pulse width modulation. |
| Operating time (receiver) |
| Indicates the receiver’s operating time with a new, fully charged battery or accupack. |
| Range |
| See RF wireless headphones, transmission loss. |
| Sound pressure level (SPL) |
| Due to the impractical numerical values, the sound pressure is usually given as the logarithmic value of the sound pressure level according to the equation: dB SPL = 20 x log (po / 0.00002 Pa). The abbreviation SPL (sound pressure level) is added in order to make a clear distinction from other uses of dB. The reference sound pressure, which is at the same time the threshold of hearing, is then 0 dB SPL. The threshold of pain is 140 dB SPL. A difference in the sound pressure level of 1 dB is just about perceptible, while a doubling of the sound pressure corresponds to 6 dB and a doubling of the volume corresponds to a rise of 10 dB. |
| Total harmonic distortion (THD) |
| Total harmonic distortion is a measure of non-linear harmonic distortion and is given in %. Non-linear harmonic distortions are signals which were not present in the original before the signal was converted by the headphones. These unwanted signals are caused by the diaphragm, whose movements do not precisely move in time with the electric signals that cause it to move. Unfortunately, this is a feature of all electroacoustic transducers. Although it cannot be completely eliminated, suitable steps can be taken to minimise it. However, the user is not interested in why this distortion takes place but in how great the level of distortion must be for it to become perceptible. According to the findings of several research projects, a total harmonic distortion of 1% in the frequency range of 100 to 2000 Hz is imperceptible. Below 100 Hz, the perceptibility threshold lies at 10%. |
