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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:

Sonic Electronix Insights (Scale from 1-5, 5 Being the Best)

Comfort & Ergonomics
Rates how comfortable the headphones are, taking into account build quality and materials used. Judged on a scale of 1 to 5 with 1 being uncomfortable and 5 being so comfortable you could sleep while wearing them.
Overall Audio Quality
Overall rating of how well the headphones perform with 1 being an unimpressive audio quality and 5 being the absolute best.
Hip-Hop, Rap, EDM, Dubstep & Pop Optimized
How well the headphones perform for hip-hop, rap, EDM, dubstep and pop music genres with 1 being not recommended and 5 representing headphones that were designed with these specific genres in mind.
Rock & Alternative Optimized
How well the headphones perform for rock and alternative genres with 1 being not recommended and 5 representing headphones that were designed with these specific genres in mind.
Instrumental & Classical Optimized
How well the headphones perform for instrumental and classical music genres with 1 being not recommended and 5 representing headphones that were designed with these specific genres in mind.
Optimized for All Genres
Rates how well the headphones perform for all music genres with 1 being not recommended and 5 being top-of-the-line music reproduction.
Build Quality
Overall Construction quality of the headphones. This rates on a scale of 1 to 5 the overall construction quality of the headphones with 1 being the poorest quality and 5 being as close to indestructible as a pair of headphones can get.
Design
Overall design of the headphones. This rates on a scale of 1 to 5 the overall design of the headphones, including construction, sound quality and accessories with 1 being the lowest and 5 being top-of-the-line.
Isolation
Rated on a scale of 1 to 5 with 1 being no isolation and 5 being complete isolation, this gives you an idea of how well the headphones seal your ears from your surrounding environment.
Value
Value refers to the quality of headphones (how they sound, how they're built, etc.) for the price.

Sound Signature

Sound Staging & Imaging
Sound Staging and Imaging refers to the ability of a pair of headphones to create the placement of instruments and vocalists in a recording. A small sound stage is very difficult to determine where the instruments are in relation to the vocalists, everything sounds like it's coming from the same place. An extra large sound stage separates the instruments and vocalists so that you can clearly tell where each is on the sound stage.
Clarity/Detail
Refers to how clear the headphones audio reproduction is.
Tone/Timbre
Refers to the quality of a music note that distinguishes different types of sound production (voices, musical instruments, etc.).
Bass
Refers to the bass performance of the headphones. Rated from Light bass to extreme bass.
Bass Detail
How accurately a headphone can reproduce bass notes; a culmination of attack, speed, decay and clarity. Attack is how precisely it can begin a bass note without delay. Speed is the ability to continue to attack an array of bass notes without lagging. Decay is the length of time after a bass note ends that the sound is still heard. Clarity is how easily all bass frequencies are heard. It gives perception of loose, tight, or muddy bass.

Headphone Design

Headphone Type

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.

On-Ear
Headband 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
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.
Home/Portable
Headphone Application

This is the application that the headphones are designed for. Each application has unique features that make it perfect for particular uses.

DJ: These headphones are durable, loud, and will often allow for one ear listening.

Gaming Delivers explosive sound and allows you to communicate with others.

Home Hi-Fi: These audiophile headphones are engineered to produce high fidelity and accurate audio.

Home/Office: These headphones are designed to produce rich, brilliant sounds that the artists would appreciate.

Sports: Designed for active use. These headphones are made to stay in (or on) the ear during workouts.

Kids: Feature noise limiting technology so that your little ones don't damage their ears listening to music too loud.

On-the-Go: On-the-go headphones are lightweight and often fold up for easy storage and portability.

Student: Compact and rugged enough to survive life in a backpack; inexpensive enough to not hurt the wallet of a student.

Studio: Reproduce music perfectly without any coloration. Look here for reference quality studio monitoring headphones.

Traveler/Airplane: These headphones are compact, lightweight, and have a portable design.

Home Hi-Fi
Home/Office

General Features

Noise-Canceling
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.
No
Device Controls & Compatibility
Refers to the devices the in-line controls are compatible with.
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.
No
Smartphone/Tablet App Available
These headphones have a companion app available from the manufacturer. These apps are generally available on both the Google Play Store and iTunes for Android and iPhone use. They usually include an equalizer and other controls to give you complete control over your music.
Equalizer/Tunable
This means the sound of these headphones can be customized to your listening preference through either an app or on-board controls.
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.

Bluetooth means that the audio signal is transmitted from your device to the headphones via a Bluetooth connection.

Corded or Bluetooth means that the headphones can be used as corded headphones or as Bluetooth headphones. They have an input in one or both earcups for use as a corded headphone while they also have a built-in battery for use as Bluetooth wireless headphones.

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

Bluetooth Wireless
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.
No
Bluetooth Version Compatibility
Which version of Bluetooth the device is compatible with. Is it important that the both devices being paired are the same version of Bluetooth. For example, a Bluetooth version 2.0 cell phone can be paired with a compatible version 2.0 headset.
aptX Codec
Refers to whether these headphones feature aptX Bluetooth audio streaming.
Jack Size
Refers to whether the headphones use a 3.5mm or 1/4" headphone jack connection.
Jack Angle

The Jack Angle refers to the angle of the input jack on the headphone cable.


Straight Jack: Straight plug with no angle.


Angled Jack: Angled plug, usually a 90 degree angle.

Swivel Jack: A swivel jack is able to swivel between a straight plug and an angled plug.

Included Adapters
Refers to the connection adapters included with the headphones like 3.5mm or 1/4" input adapter as well as airplane adapters that let you use your headphones with airplane specific headphone jacks.
Detachable Cable
Refers to whether the cable can detach from the headphones. If a pair of headphones has a detachable cable, the cable can be replaced with a longer cable, one with (or without) a microphone or if you accidentally damage the cable.
Color Shades
Primary color shades of the headphones.
Material
Refers to materials used to build the headphones. Most headphones are built from some combination of plastic and metal to give you a durable pair of headphones.
Ear Cushion/Earbud Material
Refers to the material that the ear cushions/earbuds are made from. Ear cushions and earbuds are available in a variety of materials, ranging from basic rubber eartips to plush leather ear cushions intended for maximum comfort.
Replaceable Ear Cushions
Refers to whether the ear cushions can be removed and replaced. Often times on heavily used headphones, the ear pads can wear out long before the actual headphones. Headphones with replaceable earpads often last much longer than headphones without replaceable earpads.
Protective Case
Refers to whether a pair of headphones come with a protective case.
Weight (oz.)
This is the weight of the unit in ounces.
Water Resistant
This refers to the level of water resistance of the fitness tracker. Some fitness trackers are water resistant and can be used while swimming, while others are only splash proof or should not be used near the water.
Child Safe
Refers to whether a pair of headphones are designed specifically for children. Child safe headphones feature volume limiting technology so that your child canít damage their ears while listening to music.
Foldable
Refers to whether a pair of headphones can be folded up. These headphones feature hinges in the frame above the earcups that allow the headphones to neatly fold into a much more manageable size. Folding headphones are perfect for anyone who spends a lot of time traveling and needs a compact pair of headphones that can fit in their bags.
Ear Hooks
These headphones feature hooks that wrap around your ears for a secure fit.

Gaming Headphones

Compatible Systems
Refers to what system(s) these headphones are compatible with.
Wireless Type
Refers to the wireless connection type used by these headphones.
USB Connection
Refers to whether these headphones can be connected via USB.
Noise Cancelling Microphone
Refers to whether the microphone eliminates ambient noise for crystal clear conversations.
Detachable Microphone
Refers to whether the microphone can be detached from the headphones.
Microphone Impedance
The opposition to electric current, a higher impedance means a higher electrical resistance. This is measured in ohms.
Microphone Frequency Response
The range of frequencies the microphone will pick up (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better.
Surround Sound
Refers to the surround sound type used by the headphones.
Separate Game & Chat Volume Controls
Refers to whether the headset has separate volume controls for the game and chat channels.

Home Wireless Headphones

Hub Connection Type
Refers to how the hub connects to your home stereo system
Wireless Type
Refers to the wireless connection type used by these headphones.
Wireless Range
The maximum distance the headphones can be from the hub and still work in feet.

Audio Features

Sensitivity
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
Power Output
Refers to the power output rating (in watts) of the headphones.
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
Audiophile
Audiophile headphones represent some of the finest headphones available. Audiophile headphones produce genuinely outstanding sound quality as well as extraordinary build quality, components and comfort. They are truly the finest headphones available.
Built-in Amplifier
This refers to whether the headphones have an amplifier built-in.
Amplifier Recommended
This refers to whether a separate headphone amplifier is recommended for use with a specific pair of headphones. It is highly recommended that any headphone with an impedance greater than 100 ohms be amplified.
Pass Throughs
Refers to whether a pair of headphones has an output to connect to another pair of headphones.

What is in the Box?

Main Product
The main product in the box.
Accessories
Accessories included with the headphones
Paperwork
Paperwork included with the product.

Warranty and Return Policy

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

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
50%
4 Star
50%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
5.0
Value
4.5
Features
4.5
Design
3.5
Usability
4.5
Kevin

Binghamton, NY

Overall
Durability
Value
Features
Design
Usability
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!!

5 of 8 found this helpful

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Tony

Shelton, CT

Overall
Durability
Value
Features
Design
Usability
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.

4 of 8 found this helpful

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Product Summary

Manufacturer

Model Number

HD 25-1 II

UPC

615104135703

Weight

1.00lb

Internal SKU

hd251ii

Internal Product ID

31602

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