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Sennheiser HD 25-1 II

On-Ear Closed Back Professional Audiophile Headphones with Padded, Split Headband and Extra Earpads


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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 HD 25-1 II
  2. 1/4" Adapter (Model 543684)
  3. Protective Carrying Case
  4. 2-Pair or Earpads (4)
    1. 2 Velour: 069417
    2. 2 Leatherette: 075527
  5. Owners Manual/User Guide
  6. Authorized 2-Year Warranty
  • On-Ear Closed Back Professional Audiophile Grade DJ Style Headphones
  • Capable of taking on the high demands and performance levels required by DJs for huge debuts, shows, and club appearances with High Maximum Sound Pressure Level
  • Lightweight and comfortable, with a Padded Split Headband Design, evenly dispersing points of contact and weight
  • Unique Rotatable Ear Shells provide DJ like Swivel Motion ideal for single-ear monitoring (one-ear), or allowing yourself to hear outside noises like a flight attendant giving direction
  • Engineered with a 70 Ohm Impedance, ideal for DJ use, and use with portable media/MP3 players with universal connectivity
  • Engineered with powerful, maximum performing Neodymium Ferrous Magnets and Lightweight Aluminum Voice Coils for the best sound possible
  • Powerful, Specifically Tuned Neodymium Ferrous Magnets ensure optimum sensitivity and an excellent dynamic response
  • Exceptionally Natural, Spatial and Accurate Sound, provides balanced sound reproduction, necessary for professional usage
  • Detachable, Kevlar Reinforced, OFC Copper Cable (1.5 Meters)
  • Sennheiser HH 10 Universal Holder (Mount) Available
  • Includes Two Pairs of Ear Pads, ideal for casual usage, or optimized for peak performance
  • Primary Color Tone: Black
  • Manufacturer Part Number: Sennheiser 502188
  • Sennheiser HD 25 Was Used As the Model, and Inspiration for the Production of the Amperior Series Headphones Available In Amperior (Silver) , and Amperior (Blue)
  • Authorized Sennheiser Internet Retailer
  • 2-year Manufacturer's warranty
Product Specifications:
  • Transducer Principle: Closed, Dynamic
  • Ear Coupling: On-ear
  • Contact Pressure: 2.5N
  • Nominal Impedance: 70 Ohms
  • Frequency Response (Headphones): 16 - 22,000 Hz
  • Sound Pressure Level (SPL): 120 dB
  • Load Rating: 0.2 W
  • Total Harmonic Distortion (THD): 0.3 %
  • Weight without Cable: 9.2 oz. (260 g)
  • Cable Length: 5 ft. (1.5 m)
Authentic Original Parts Available:

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

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).
16 - 22000 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".
120 dB

Specials with this Item

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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


Binghamton, NY

Exceptional service!

April 7, 2014

I purchased Sennheiser HD 25-1 II headphones which are a quality product for live broadcast and live events. Extremely pleased with the price and shipping from SonicElectronix. A good value, fast shipping. For live performances, nothing beats Sennheiser!!

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Shelton, CT

Time tested and proved

July 31, 2013

For those who arn't familar, Sennheiser is one of the most well respected headphone companys in the world. The hd-1 ii is a great set of closed back headphones. They isolate outside sound amazingly well, there for have been used by djs for many years. Some of the the world's most famous djs swear by them, not to mention they are ridiculously durable. If you notice, most sports announcers use a modified version of these headphone with a mic attatched due to their great sound isolation. They have a relativly balanced sound signature, solid bass and treble extension with great mids. Unlike many of today's headphones (beats for example) the hd-1 ii does not bloat the bass and in result the rest of the sound spectrum sounds great while still having bass impact. These headphones are about 80ohms, meaning they require about twice as much power to fully drive them, and so a headhone amplifier, although not completely needed, will help add "umph" to the set. These headphones may not be flashy but my advice is don't just buy into the flashy Beats by Dre trend. If you try out other headphones, even ones that cost half as much as beats, you should notice how over-rated the beats line really is.

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Product Summary


Model Number

HD 25-1 II





Internal SKU


Internal Product ID


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 HD 25-1 II