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Sennheiser HDR120

Over-Ear Wireless Headphones for RS110 and RS120 Wireless Headphone System

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List price $79.95

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Audiophile, Premium, Best In-Class, Sennheiser

Sennheiser is a name that is synonymous with audiophile products. They have been viewed as a premium, top-tier (dare we say "The" top-tier?) brand since the beginning of time. Laboratorium Wennebostel's time that is. In 1945, Prof. Dr. Fritz Sennheiser founded Laboratorium Wennebostel's, or "Lab W" in a pleasant half-timbered house. Fritz Sennheiser was born with a gift. When he was 11 years old, he saw an early radio that inspired him to build a crystal radio. Again, he was 11 years old. There was no turning back from that day. The following year after founding "Lab W", Sennheiser produced his microphone. From that point on, it was one success story after the other. Sennheiser's technology continued to improve, and "The Bar" continued to rise. In the mid 60's, Sennheiser released the HD 414, the world's first "Open Headphones". That very day changed the future of headphones forever. That very same headphone, the HD 414, not only helped establish Sennheiser as a leading headphone manufacturer, but it sold over 10 million units. It is the best selling headphone of all time, and Sennheiser had just gotten started.

What's In The Box?
  1. Sennheiser HDR 120 Wireless Headphones
  2. 1-Pair of NiMH Rechargeable "AAA" Batteries (x2)
  3. Owners Manual & Operating Instructions
  4. Authorized 2-Year Warranty

General Features:

  • Over-Ear Wireless Headphones for RS110 and RS120 Wireless Headphone System
  • Wireless freedom and stereo sound with reception through walls and ceilings up to 328 feet
  • Over-ear design
  • E.A.R. (Ergonomic Acoustic Refinement) for excellent accuracy and clarity
  • Neodymium magnet system for dynamic frequency response
  • Gloss burl wood parts for sophisticated finish
  • Lightweight aluminum voice coils
  • Duofol diaphragms for transparency and minimal distortion
  • Extremely comfortable velour ear pads and headband
  • Surround reflector for extended spatial sound field
  • Adjustable headband for comfortable listening sessions
  • Sennheiser HH 10 Universal Holder (Mount) Available
  • Item Reference # 009931
  • Main Color: Black
  • Authorized Internet Dealer
  • 2 Year Manufacturer's Warranty

Product Specifications:

  • Frequency Response: 22-19,500 Hz
  • Sensitivity: 106 dB
  • Nominal Impedance: 24 Ohms
  • THD(Total Harmonic Distortion): <0.1%
  • Magnet Material: Neodymium

Headphone Design

Headphone Type

Headphone type refers to the construction of the headphones.

Around the Ear means that the headphones wrap around the ear to provide a secure fit. This is most often seen in active and sports headphones.

Around the Neck means that the headphones wrap around the neck. This is also seen in active and sports headphones.

Earbuds means that the right and left sides of the headphones are separated and will fit securely into the ear. These are small, compact, and user friendly.

Over the Head headphones mean that the right and left speakers are connected with a support that goes over the head and rests on top. This is the typical headphone type.

Over the Head
Earpiece Design

This is the design of the earpieces on the headphones. Some headphones go inside the ear, while others rest on the outside of the ear. This helps you know exactly what type of headphones you will be receiving.

In-Ear: The ear buds go into the ear. Most often, the right and left ear buds are two separate pieces.

Enclosed-Ear: Usually are found on the larger headphones. They rest on top of the ear and have padding for comfort, as well as enclosing the ear to the speaker. This type of headphone helps to filter out surrounding noise.

On-Ear: This type of headphone involves the speaker sitting gently on the ear without going in the ear or sealing it off.

Specifically For
Some headphones can use an IR Transmitter in your vehicle, while some can be plugged into your media device and be used on the go or at home.

This is the lifestyle that the headphones are designed for. Each style has unique features that make it perfect for particular people.

Designed for those that are active. These headphones are made to stay in the ear during workouts. Whether you frequent the gym a lot or go running outside in the fresh air, these active style headphones will be your best friend.

For those that need the best in music quality. These audiophile headphones are engineered to produce high fidelity and accurate audio replication.

Disc Jockeys (DJs) require a special type of headphone that can meet their professional needs. These headphones are durable, loud, and will often allow for one ear listening.

Fashion Enthusiast:
For those that want to make a fashion statement with their headphones. Not only are these headphones designed with great sound quality in mind, but also great looks!

This lifestyle speaks for itself! If you love video games and want a pair of headphones that will deliver explosive sound and allow you to communicate with others, this is where you need to shop!

Music Lover:
These headphones are made to sound great. They are designed to produce rich, brilliant sounds that will play your music in a manner that the artists would appreciate. These headphones are for those that love music.

Musical Production / Recording Artists:
You're a music creator. Whether you're producing and mixing it down or in the studio recording yourself, you need a pair of headphones that will reproduce the music perfectly without any coloration. Look here for reference quality studio monitoring headphones.

Headphones need to be affordable and durable to keep up with the student lifestyle. A variety of styles can be considered a pair of student headphones.

Those that often find themselves on planes or on the road a lot. These headphones are compact, lightweight, and have a portable design. Some of the headphones in this lifestyle will feature noise cancellation technology that will help shut out outside noise.

Music Lover
Acoustic Principle
The basic design of the headphones. There are 3 different types: Open: Have ports that allow air through the back of the diaphragms, enabling the headphones to sound like the music is coming from an outside source. Closed: Completely sealed and have no air passing through the diaphragms. Sounds like you are in a closed off room. Semi-open: Have slots or ports in the back of the cup and are partially open. This allows for a mixed sound between an open and closed headphone.

General Features

Noise Reduction technology removes unwanted noise from a signal. Background or ambient noise can be removed to produce clearer speech and enhanced hearing. Typically these Active Noise Canceling (ANC) headphones are powered and use batteries to activate the noise canceling technology. Also referred to as Noise Reduction or Noise Cancellation.
Headphone Connection
This is how the headphones connect to the audio source.

Corded means that the headphones use a cord to transfer the audio signal.

Wireless means that the audio signal is transmitted wirelessly to the headphones.

1/4" Stereo Jack Adapter
Some headphones will come with a 1/4" stereo jack adapter to connect the usual 3.5mm jack to a 1/4" stereo plug.

1/4" Stereo jack is a larger audio jack that select electronics have.

Volume Adjustment
Volume Adjustment means that the headphone (independent of the source) can adjust the playback volume. Many headphones and ear buds have in-line volume control, which allows adjusting the audible volume from a switch on the headphones cord. Other headphones have a volume knob on the headphone can.
Built-In Microphone
This means that the headphones or earbuds have a built-in microphone. This can be a microphone on the cord, built into the headphone, or even a boom microphone. These mics can be used for music devices like iPods, for Smartphones to make and receive calls, or for gaming purposes.
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
22 - 19500 Hz
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
106 dB
Driver Type
The physical design of the driver in the headphones.
The opposition to electric current, a higher impedance means a higher electrical resistance. This is measured in ohms.
24 ohms
Primary Color
This is the main color of the item.
Secondary Color
A color that compliments the main color of the product.

Warranty and Return Policy

Parts Warranty Duration
2 years
Labor Warranty Duration
2 years
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating

Joan Z

Conyers, GA

Excellent product

October 31, 2014

We already had one pair of these headphones that worked well but when the battery died, it took awhile for them to recharge. Now my husband has a spare. As with the original, the headpiece seems a little large but it's great having a second set without having to wait or buy another charging unit.

0 of 0 found this helpful

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Santa Clara, CA

Very Clean Deal

October 30, 2014

The product delivered was exactly as advertised and received in a timely manner.

0 of 0 found this helpful

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herby derby


super product with a super deal.

October 4, 2014

i love the headphones. i use them every day and they never fail me. i like the rechargeable ones. so comfortable and clarity is awesome. i have a hearing problem and they keep my tv at a comfy volume for others. i have three pairs and would buy another when needed. thank you for the great deal.

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Los Angeles, CA

Great headphones

September 7, 2014

I bought this pair to replace the same model that I had been using for a few years. Great sound quality. Only downside is that the headphones are a little bulky.

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Aurora Colorado

exactly what I was looking for

September 2, 2014

Purchase these headphones several years ago for my parents. My Dad's set finally broke. I will continue to buy these headphones. Great headphones for the price.

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Columbia, KY

Great headphones

February 7, 2014

I purchased these headphones for watching television without disturbing the whole house. They have excellent sound quality (what else would you expect from Sennheiser?) You can't beat the price on any other quality headphone.

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San Diego.Ca

Great product at a reasonable price

December 19, 2013

Last year, 2012 I wanted a good set of headphones to enjoy my movies late night while everyone's sleeping. They took 2 mins to setup. When I turned them on, after a full charge, I was impressed with the clarity of the highs. The bass is deep and smooth. Even at lower volume levels. I thought I was in a movie theater. The surround sound is incredible. I have a two story home about 1700 sq ft and I could not find any place in the house, or garage, where I experienced signal loss or a degrade in performance. They also hold a charge all day. Watched 3-2hr +movies and still had enough for several hrs of TV. They are pretty light and very comfortable too. This year I am buying another set for our TV upstairs so my (hard of hearing) wife can watch her shows, as loud as she wants, without interrupting my daughter's or my tv viewing in other parts of the house.

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Love These

October 1, 2013

If you are reading this then your interest is placed correctly! For the price these headphones sound amazing. The first pair of open eared headphones I own, I had too many questions about how they would sound, what they would fit like, how much the people around me would hate me.

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Browse 3 questions and 5 answers
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Why did you choose this?
Sonic Electronix Store
Good reviews and I'm familiar with the name. Owned sennheiser microphone.
armond r r on Oct 19, 2014
Will Sennheiser HDR120 work with my HDR-126 ?
Jean-Guy T on Aug 7, 2014
Best Answer: I chose these headphones based on the rating, the company and my needs. I have a husband that is hard of hearing and he loves these for watching TV late at night.
Reply · Report · Diana L on Dec 4, 2014
· Add Answer · I Have This Question Too (1)
Are These factory new headphones?
Richard B on Dec 4, 2014
Best Answer: Yes these are factory new headphones and they are great, and well worth the money
Reply · Report · Diana L on Dec 4, 2014
· Add Answer · I Have This Question Too (0)

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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Sennheiser HDR120