Name: Sennheiser HDR 120
Brand: Sennheiser
SKU: 143HDR120
Rating: 5 (24 reviews)

by Crutchfield's Dave Bar

Add an extra HDR 120 headset (or even two or three) to your Sennheiser RS 135-9 wireless headphone system and share the fun. Its open design delivers warm, detailed sound with plenty of bass. Cushioned earpads and headband make it comfortable to wear for hours.

Product highlights:

add-on headset for use with Sennheiser's RS 135-9 wireless headphone system (sold separately)
RF wireless receiving range: up to 328 feet
each headset features a volume control, on/off switch, and tuning button
frequency response: 22-19,500 Hz
headphones use 2 "AAA" NiMH rechargeable batteries (included)
requires transmitter/base-station from RS 135-9 system for use
headset weight: 8.1 oz.
warranty: 2 years
MFR # 009931

What's in the box:

Sennheiser HDR 120 owner's manual

HDR-120 Wireless on-the-ear headset
2 "AAA" Ni-MH rechargeable batteries (1.2V/600 mAh)
Instructions (English/ German/ French/ Italian/ Spanish/ Portuguese/ Dutch/ Finnish/ Greek)
RS 120 connection diagram

Scratch & Dent items may be missing non-essential accessories. In some cases the manufacturer's accessories have been replaced with generic equivalents.

See the difference between "Open Box" and "Scratch & Dent" Outlet items

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24 reviews

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Researched by Crutchfield's Mark G.

Product Research

Features

Overview: The HDR 120 can be used as an additional headset for the Sennheiser RS 135-9 wireless headphone system with an open air, on-ear design. They are also compatible with the RS 120 and RS 110 wireless headphone systems.

Batteries: Power for the headset is provided by two rechargeable "AAA" batteries (included) that fit into a compartment in the headset. The batteries are recharged whenever the headset is placed on the transmitter included with the RS 135-9 system. Fully charged batteries have an operating time of approximately 20 hours. The RS 135-9 system manual recommends an initial charging of 24 hours before the batteries are first used, after that the normal charging time is approximately 18 hours.

Note: Only rechargeable batteries should be used.

Controls:

Volume: thumbwheel volume adjustment; on the right earcup
Tuning: tune the headset to the transmitter for the clearest reception; on the right earcup
Power: turn the headset on/off; on the left earcup

Specifications:

Reception Frequency: 926-928 MHz
Modulation: FM stereo
Frequency Response: 22-19,500 Hz
Maximum SPL: 106 dB
Weight: 8.1 oz

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6 questions already asked

I have a Samson smart tv. sometimes after using my headphones the tv sound will turn off. how do I correct this? worked great on my old Samson tv,

ed Dec 30, 2020

1 answer

The way my equipment is set up, I listen to the sound on the tv (I believe from my cable box) though my receiver. The Senheisser headphones work perfectly with this set up. The volume is controlled by the receiver and the headphones. I bypass the tv volume and do not use it to get sound.

gary Dec 30, 2020

No sound in the head set. I have checked all of the connections and all are ok. The green led light is not coming on when the TV is turned on. I do have static in the headset. I have adjusted the tuning knob several times with no sound, What can I do?

rich Mar 21, 2020

3 answers

Some possibilities: 1. Recharge the headset by placing it on the cradle for at least 24 hours. (When I recharge the headset, I first turn the sound knob on the headset to the off position.) 2. If the above doesn't work, you can try replacing the batteries on the headset with 2 fresh AAA rechargeable batteries. If the new batteries are not pre-charged, place the headset with the new rechargeable batteries on the cradle (with the headset sound knob in the off position) for at least 24 hours before use.

gary Mar 23, 2020

Simple question, but have you changed the batteries?

paris m. Mar 21, 2020

The green light in my receiver has been out since I got it. Both my headphones worked fine till about a week ago. Spoke with Zane at Crutchfield and he sent me a new one. Received it a couple days ago and both 120 and 135 headphones work perfectly now.

ronald Mar 21, 2020

no sound, I put new batteries in, still no sound? what can I do?

kay Apr 03, 2019

7 answers

Do you have static if the TV is not turned on. You should if it is tuned properly, and audio turned up. If no, chances are the transmitter is not transmitting. Try a different channel on the transmitter. Are you getting audio out of the TV? Try swapping left and right channels. Sounds odd, but try licking the positive end of the batteries. Saliva is a conductor. Hope something works.

paris m. Apr 04, 2019

Addendum to my earlier email answer: The customer mentioned that she put in new batteries. In order for the headphones be charged/recharged on the cradle, I believe that only rechargeable batteries as those that come with the headphones should be used.

gary Apr 04, 2019

According to the instructions, the headphones need to be charged for 24 hours before use. This is done by placing them on the cradle (which, of course, needs to be plugged into a power source). A red light will appear. I then plug the wire from the cradle into the phone outlet on my receiver. I turn on the receiver and the on switch on the headphones. Additionally, the headphones need to be tuned by moving the tune dial on the headphones (as one would tune a radio dial to get a station). I recharge the headphones on the cradle every night, follow the above procedure, and they work beautifully.

gary Apr 04, 2019

Try turning the little thumb wheel at the bottom of the right ear cup. If that doesn't work, return them for another pair.

richard Apr 03, 2019

Since you have new batteries we can move on to other possibilities . Easiest first. Have you tried to adjust tuning dial on headset? Also, if you have a new TV it may not have analogue sound capability which is required for the Sennheiser HDR 120. Check your TV settings to make sure. If not, you will need a digital to analogue converter. Also be sure that cable connections in back of the 120 are plugged in securely. Mine we very snug and difficult to get good connection.

chris Apr 03, 2019

Make sure the sound is turned up sufficiently from the device that the transmitter is plugged into. Tune the headphones with the tuning dial so that they are receiving sound from the transmitter. It is like tuning into an old style transistor radio. Make sure the volume is turned up sufficiently on the headphones themselves. Hope this helps.

cory Apr 03, 2019

Is your charging stand connected to the correct sound output. We have ATT and the charging station has to the connected to their equipment not to the TV. I have also noticed if the batteries are not pushed in all the way then we have no sound.

carol Apr 03, 2019

Where can I get new foam ear piece covers?

peg Sep 24, 2017

1 answer

Thanks for your question. Crutchfield does not have the replacement covers. You can contact Sennheiser directly. Their Customer Support number is 860-434-9190 . Hope this helps.

kenneth Sep 25, 2017 (Staff)

RS 120 come with base chargeer?

jonell Mar 16, 2017

1 answer

Thanks for your question. I'm sorry, no, there is no base included. On the main product page you can see what's in the box which is HDR-120 Wireless on-the-ear headset and 2 "AAA" Ni-MH rechargeable batteries (1.2V/600 mAh). For the base to be included you would have to purchase the RS 135-9 at the link below, hope this helps. https://www.crutchfield.com/p_143RS1359/Sennheiser-RS-135-9.html

kenneth Mar 17, 2017 (Staff)

my headset just stop working can they be repaired?

james Mar 05, 2017

1 answer

If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can help troubleshoot the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/.

kenneth Mar 06, 2017 (Staff)

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