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Koss ESP-950 Electrostatic Stereophone, Full Size Over-Ear Headphone, Leather Carrying Case Included, Black

3.9 3.9 out of 5 stars 59 ratings

To see product details, add this item to your cart. You can always remove it later.

Purchase options and add-ons

Brand Koss
Model Name Noise-Cancelling-Feature
Color Black
Form Factor Over Ear
Connectivity Technology Wired

About this item

  • Electrostatic transducers deliver clean bass and unmatched sound quality
  • Pivoting ear cups and an adjustable/detachable headband ensure ultimate comfort and convenience
  • Straight, dual-entry 4 foot cord with 6 foot extension
  • Includes energizer, battery pack, leather carrying case, connecting cables and 120 VAC adapter
  • Includes energizer, battery pack, leather carrying case, connecting cables and 120 VAC adapter
  • Limited Lifetime Warranty

Additional Details

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 11.5 x 6.5 x 9.5 inches; 4.49 Pounds
  • Item model number ‏ : ‎ ESP950
  • Date First Available ‏ : ‎ March 6, 2001
  • Manufacturer ‏ : ‎ Koss Corporation
  • ASIN ‏ : ‎ B000056ULH
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    3.9 3.9 out of 5 stars 59 ratings

Important information

Legal Disclaimer

Warranty does not cover misuse of product.


From the brand


Product Description

ESP/950

Premium Design

All while maintaining it's ultra lightweight design, ESP/950 is crafted with durable steel acoustical grills, premium decals and leatherette cushions.

ESP/950

The Electrostatic Difference

With a frequency response of 8-35,000 Hz, ESP/950 delivers unparalleled sound reproduction, clarity and accuracy.

ESP/950

Detachable Earcups

ESP/950 features detachable ear cups for convenient storage, transportation and simplified ear cushion maintenance.

ESP/950

Luxurious Comfort

Plush leatherette ear pads delicately cradle the ears, allowing for extended listening sessions without discomfort.

Experience the Electrostatic Difference

Koss ESP/950

Unparalleled Sound Reproduction

At the core of the ESP/950's brilliance is its electrostatic driver system. This advanced technology delivers an unparalleled level of sonic accuracy and transparency, reproducing audio with breathtaking realism, making you feel like you're right there in studio.

Koss ESP/950

Made in the USA

In an era where mass production dominates, the ESP/950 Electrostatic headphones are a beacon of handcrafted excellence and are made, hand assembled and tuned at Koss World Headquarters in Milwaukee, WI.

Koss ESP/950

Fine Tuned Audio

Each ESP/950 is calibrated by Koss. Each driver is delicately handled and tuned to ensure optimal performance, delivering unrivaled audio precision .

Koss ESP/950

Ultra Lightweight Design

Weighing in at approximately 353 grams the ESP/950 is designed to strike a delicate balance between substance and comfort for hours of listening.

ESP/950

E/90 Energizer

Power from the E/90 Energizer delivers the full potential of the electrostatic drivers with an input impedance of100k Ohms.

ESP/950

Protect Your Investment

The included premium calf skin carrying case stores the ESP/950, E/90 Energizer and all cords with room to spare for easy transportability.

Hearing is Believing

ESP/950 Electrostatic Headphone


The acclaimed Koss ESP/950 delivers unparalleled sound reproduction with the utmost clarity, accuracy and detail. Learn more about how electrostatic headphones work and what's included with the ESP/950 Electrostatic Headphones.

Frequency Response 8-35,000 Hz
Impedance 100k Ohms
Sensativity 104 dB, 100 Vrms differential input at 1 kHz
Diaphragm Ultra-low-mass 1.5-micron C-grade polyester film coated with semiconductive material
E/90 Energizer 1.6 Hz–50 kHz (-3 dB), 100 Vrms differential output, input impedance 100k Ohms
Voltage Amplification 60 dB
Audio Output Voltage 790 Vrms differential; 2,200 Vpk-pk differential with soft limiting
Signal to Noise Ratio -100 dB at 100 Vrms output
Bypass Voltage Supply 600 VDC
Signal Polarity Absolute phase (non-inverting)
Input Jacks RCA type (left and right), 3.5mm stereo, AC/DC adapter
Included ESP/950, E/90 Energizer, 120V or 220V AC adapter, 3 ft (0.9 m) RCA-to-RCA cable, 2 ft (0.6 m) 3.5mm–to-3.5mm cable, 6 ft (1.8 m) extension cable and leather carrying case

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Customer Reviews
3.9 out of 5 stars
59
4.6 out of 5 stars
15,769
4.5 out of 5 stars
1,743
4.2 out of 5 stars
159
4.5 out of 5 stars
856
4.5 out of 5 stars
3,305
4.4 out of 5 stars
7,955
Headphone Type
Over Ear On Ear On Ear On Ear On Ear On Ear Ear Clip
Connection
3.5mm 3.5mm Utility Series Utility Series 3.5mm 3.5mm
Utility Series
3.5mm, USB-C & Lightning 3.5mm, USB-C & Lightning
Audio Controls
E/90 Energizer In-Line Remote Utility Cord Remote Utility Cord Remote In-Line Remote
Microphone
In-Line Remote Utility Cord Remote Utility Cord Remote In-Line Remote
Noise Cancelling
Noise Isolating
Adjustable Headband
Yes Yes Yes Yes Yes Yes
Collapsible
Detachable Ear Cups Yes Yes Yes
Carrying Case/Pouch
Leather Case Carrying Pouch Hardshell Case Carrying Pouch

What's in the box

  • Cables, Battery Pack, Leather Case
  • Looking for specific info?

    Customer reviews

    3.9 out of 5 stars
    3.9 out of 5
    59 global ratings

    Customers say

    Customers like the sound quality, clarity, and balance of the headphones. They say the midrange is excellent, and the bass is excellent. They also appreciate the value for money, saying it's the best deal in consumer audio. Customers also appreciate amplifier, and brightness. However, some customers have reported issues with the build quality, saying the headphones are too fragile and made of cheap foam.

    AI-generated from the text of customer reviews

    31 customers mention22 positive9 negative

    Customers like the sound quality of the headphones. They mention that the clarity and balance of the sound are excellent, the bass is excellent, and the music is lively. The vocals sound like real people, and there's a pleasant, forgiving, even tone. The sound is very balanced, and has beautiful warm tones.

    "The ESP-950s are very nice electrostatic headphones, and if you can get them for hundreds off of the $1K manufacturer's suggested price, as I did,..." Read more

    "...off and the bass lacks kick, but it's a pleasant, forgiving, pretty even tone in between that is essentially free of artifacts in the mids and highs...." Read more

    "...Won't need to. Nothing will sound as good, and if something breaks, I send it back to Koss with a check for $9 of shipping...." Read more

    "...These changes actually make the phones sound damn good but I'm having trouble squaring this with my idea that everything should sound good with the..." Read more

    16 customers mention16 positive0 negative

    Customers are satisfied with the quality of the headphones. They mention that the midrange is exceptional, the headphones are well made, and the sound is unbelievable. They also say that the headphones make an excellent addition to an already fine system. Customers also appreciate the refined and delicate sound.

    "...& lows are rolled off and the bass lacks kick, but it's a pleasant, forgiving, pretty even tone in between that is essentially free of artifacts in..." Read more

    "...Unbelievable detail and smoothness. Unbelievable. Battery pack. Leather carrying case. Accompanying amplifier (aka "energizer")...." Read more

    "...small bulb light not really lining up correctly, but it still was somewhat solid...." Read more

    "...I'm listening to those as I write this. REALLY nice... very smooth like the Koss cans but without the roll off at the extremes...." Read more

    10 customers mention10 positive0 negative

    Customers are satisfied with the clarity of the headphones. They mention that the detail is insanely rich yet palatable, and the details flow nicely. The bass is enough and the headphones are quite detailed.

    "...Very midrange-oriented. Very smooth. A perfect balance between not-too-dry and not-too-liquid. Just right in that quality...." Read more

    "...Unbelievable detail and smoothness. Unbelievable. Battery pack. Leather carrying case. Accompanying amplifier (aka "energizer")...." Read more

    "...I'm listening to those as I write this. REALLY nice... very smooth like the Koss cans but without the roll off at the extremes...." Read more

    "...The sound is very balanced. Beautiful warm tones yet so crisp. Every note and conversely every flaw in the recording is out there to be heard...." Read more

    8 customers mention8 positive0 negative

    Customers appreciate the value of the headphones. They say it's a great headphone for the price, worth the sticker price, and the best deal in consumer audio. Customers also mention that it has phenomenal performance at a bargain basement price.

    "...this is all hyperbole, but it's not to me, This is the best deal in consumer audio IMO...." Read more

    "...PROS:Excellent Value (when it works)Includes everything to play or connect with.It's portable...." Read more

    "...Buy these things, they're easily worth the sticker price, but shop around I got mine under 600...." Read more

    "Great headphones for the money.would recommend" Read more

    3 customers mention3 positive0 negative

    Customers appreciate the headphones' amplifier. They mention that they are lightweight and come with their own amplifier.

    "...They are lightweight. They come with their own amplifier (you have to use it, or a Stax amp with a modified cable)...." Read more

    "...And it comes with an amplifier included...." Read more

    "...These come with their own amp and the accessories are top notch. Keep in mind these are not portable headphones...." Read more

    3 customers mention3 positive0 negative

    Customers like the brightness of the headphones. They mention that the frequencies are not harsh or bright, and the highs are not sharp.

    "It's actually not bright or strident at all. Very midrange-oriented. Very smooth. A perfect balance between not-too-dry and not-too-liquid...." Read more

    "...Cymbals, triangles, hi-hats are crisp and clean, just the way I expect them. Bass is tight and full with just the right amount of impact...." Read more

    "...Beautify sound throughout the range. No harsh highs, lows are perfect (EQ a tad at 20-40hz) but pretty flat across the range.Cons:..." Read more

    8 customers mention5 positive3 negative

    Customers are mixed about the weight of the headphones. Some mention that it's very light and portable, while others say that it won't fit in their pocket.

    "...What matters is inside the plastic. And it keeps the weight down...." Read more

    "...Includes everything to play or connect with.It's portable.Comes with a quality real leather carry-all bag...." Read more

    "...in the sense that you can run the amp off of batteries, but it won't fit in your pocket, so I would classify it more as "movable" from room..." Read more

    "Comfort: one of the most comfortable headphones I used. It's very light and you barely notice its there...." Read more

    9 customers mention0 positive9 negative

    Customers are dissatisfied with the build quality of the headphones. They mention that they have some quality control issues, the ear cushions are made of cheap foam, and the headphones are too fragile. Some customers also report that the repair service is unreliable. Overall, customers are disappointed with the quality and durability of the product.

    "...Cons: They are made of plastic and the earpads are "pleather" or naugahyde, or whatever you wish to call fake leather...." Read more

    "...thinking about this for awhile I decided these headphones may be too fragile and not worth my cost to own again and may weigh heavily against a..." Read more

    "...Build Quality: the material seem cheap. The light weight, of both energizer and headphones, doesn't inspire much confidence...." Read more

    "...Of course, as others have posted, they appear to be a bit cheaply made (though the carrying case is great), and for that they get a deduction from me." Read more

    I really like this headphone
    5 Stars
    I really like this headphone
    I really like this headphone. It's hard for me to make the decision to return it. The main problem is its service. When it came, the produce box was broken while the package box was ok. It made me feel it was not a brand new one. It looked like pre-owned or opened by someone before. That made me very uncomfortable.
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    Top reviews from the United States

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    Top reviews from other countries

    PhilTO
    5.0 out of 5 stars Smooth, detailed, transparent
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