Sennheiser RS 140 RF wireless headphones at Crutchfield

characteristics controls connections specifications dimensions


Reading: Sennheiser rs140 wireless headphone

design: the rs140 uses a comfortable closed circumaural (over the ear) design, so you won’t disturb anyone around you. sennheiser headphones adjust to the shape of your head, with their joints, flexible materials and extendable arms. the comfortable cushions provide optimal comfort where the sturdy material would rest on your head.

transmitter: the system comes with an rf transmitter that connects to an audio source via a headphone jack or preamp outputs. The transmitter sends a 926-928MHz signal to the headset, using one of three selectable transmission channels. The transmitter has an auto power on/off function. The transmitter turns on and starts transmitting when it detects an audio signal, and it will turn off if no audio signal is detected for 3 minutes. The transmitter also doubles as a battery charger for the supplied NiMH rechargeable batteries and a storage cradle for the headset when not in use.

Headphones: Headphones feature soft vinyl ear cushions for comfortable listening. the left earcup houses the user-replaceable rechargeable batteries and the on/off switch. tuning button, volume and balance controls are on the right earcup. The headset also has contacts that allow the batteries to be recharged when the headset is placed on the transmitter cradle. If no transmitter signal is detected for ten minutes, the headphones automatically turn off.

rechargeable ‘aaa’ batteries: The headphones are powered by two ‘aaa’ batteries that fit into a compartment on the headphones. The system is supplied with two rechargeable Ni-MH batteries. the headphone batteries recharge each time they are placed in the transmitter cradle. fully charged batteries have an operating time of about 23 hours. the manual recommends an initial charge of 16 hours before using the battery for the first time, after that the normal charge time is about the same as the previous operating time.

Smart Charge: When the batteries are fully charged, the unit automatically switches to trickle charge to prevent overcharging.

noise gate: the tr140 transmitter has a noise gate function to reduce noise when no audio signal is being transmitted (during a pause).

Auto Tuning: When the headphones are turned on, the receiver automatically searches for the transmitting frequency, starting with the last used channel. There’s also a manual seek button to retune in case the receiver locks on the wrong signal from a different nearby device. The auto-tune feature ensures that RF transmission signals arrive crystal clear at distances up to 330 feet. at the touch of a button, the clearest signal is automatically tuned in.

Auto Level: The transmitter is equipped with an automatic level control which ensures that the headphones always receive an optimal signal. the signal level (not volume) is continually adjusted during operation. the led flashes if the source signal level is too high or too low.

dynamic compression: the rs140 system is equipped with a circuit that compresses the dynamic range (increases the volume of soft passages and decreases the volume of loud passages) to ensure speech intelligibility. this feature is turned on (or off) using the switch on the front of the transmitter.

Balance: A dial on the right cup of the earphones adjusts the left/right balance. the dial has a click stop at the center position.

See also: How To Measure Headphone Decibels? Top Full Guide in 2022

Wall Mounting: The transmitter can be wall mounted using the keyhole slot on the back. mounting hardware is not included.



  • channel: select transmission channel 1, 2 or 3
  • compression: enable/disable


  • volume control: adjusts the headphone volume
  • tuning button : tunes the headset for the clearest reception
  • on/off switch: turns the headset on or off
  • balance: left balance/ right



  • audio input: stereo rca cable
  • dc input: dc jack for use with the supplied ac adapter
  • charging contacts: charges the batteries in the headset when placed on the cradle


  • charging contacts: interface with transmitter rails to charge nimh batteries



Leave a Comment