Introducing My "2E1: Two Ears in One"™ Stereo Headphones For The Unilateral / Single-Sided Deaf  With True Stereo Separate Left and Right Channels Going Into One Ear!™ 

With my 2E1: "Two Ears in One" stereo headphones, if you recently lost hearing in one ear you can hear audio in true stereo via a headphone again! 

With my 2E1: "Two Ears in One" stereo headphones, if you have always been single-sided deaf you can now hear audio in true stereo via a headphone for the first time! 

That is what "2E1"™ means: "Two Ears in One"™! Separate Left & Right side drivers producing true stereo audio for one ear! No more mixing of the two-channel stereo audio signal into one-channel mono! 

How the 2E1 came about:

I had suffered total hearing loss in one ear from an acoustic neuroma tumor and while I was in recovery from the tumor removal surgery and looking to relax via activities involving listening to headphones, I found I could no longer use and enjoy my old normal bilateral headphones in all the ways I was used to. While this was expected after my unilateral hearing loss, I was frustrated to find there were no stereo headphones made by any major headphone manufacturers for people with single-sided deafness (SSD) / unilateral hearing loss (UHL). If you listen to music via normal bilateral stereo headphones some sound is played through the Left channel and some is played through the Right channel of the stereo headphone and if you are deaf in one of your ears you will naturally miss out hearing one of the channels. I thought a solution to hearing in stereo with one ear were one sided headphones that they describe as "DJ stereo headphones" but I was disappointed because upon introspection those types of DJ headphones are not true stereo headphones due to the fact that if they only have one speaker driver to an ear it is still only mono sound even if it is converting the stereo sound into a mono-mix. This realization inspired me make good use of my Aviation Airframe & Powerplant background and design and create my own stereo headphones that will reproduce stereo into one ear for me and the end result was so successful I started making these headphone that I have dubbed the 2E1 for "Two Ears in One" for others in the single-sided deaf community. 

What I am doing with my 2E1 design:

Basically the sounds coming from stereo drivers are individual mono sounds being played on the Left or Right channel to create a stereophonic sound, a method of sound reproduction that creates an illusion of a multi-directional audible perspective. If you are unilaterally deaf you naturally miss out on this stereo Left/Right audio positioning with normal stereo headphones. While they do have mono conversions of the stereo sound to the headphone speakers, I found that mono-mixed audio makes the music sound "flat" to me knowing what it sounded like before my unilateral hearing loss and mono-mixed audio is useless for sound localization in PC/Console gaming. Mono-mixers take the Left and Right two channels and blends them into one channel and eliminating the stereo effect. My 2E1 headphones preserve the stereo two channel sound with separate L/R drivers housed in one ear-cup and thus getting true stereo sound and stereo panning effects going into your one ear. My 2E1's really are true stereo into a single ear headphones where there are separate Left and Right channel drivers playing into one ear to create a true two channel stereo experience for the single-sided deaf. The preserved two channel stereo audio sounds richer and fuller than it would if the two channel stereo signal was mono-mixed. 

With my 2E1 design, I'm positioning both the separate Left/Right driver channels inside a single ear-cup on the 2E1 headphone. Having separate magnet drivers in one ear-cup of the headphone allows your one ear to better hear the stereo panning effect between the two individual L/R speaker drivers with one ear, in other words true two-channel stereo sound going into one ear!

Inside the 2E1's ear-cup the Left driver is in the up position and the Right driver is in the down position  (as this illustrations shows) so you can hear the preserved separated two-channel stereo signal with your one ear. Additionally, I'm placing the two individual L/R speaker drivers into the headphone's ear-cup in what I call the Flying Echelon staggered formation (see diagram below). The individual Left and Right channel drivers are mechanically attached to an acoustic diaphragm that free floats inside the ear cup (hence flying) with the right driver in the down position closest to the ear and the left driver is positioned in the up position and staggered/stepped back so the left and right drivers are not in parallel alignment (hence in echelon formation).

This echelon drivers spacing on each 2E1 headphone model is designed to enhance your one ear's ability to experience the stereo panning effect without distortion of the audio signal. Additionally, as part of the Flying Echelon design the drivers are mechanically attached (no glues are used) to an acoustic diaphragm so as to produce an enhancing resonance effect to the speaker drivers audio signal.

In my 2E1's drivers configuration, the side with the cable is the side with the two L/R drivers that you place to your working ear. There is no Left or Right side orientation for the 2E1 stereo headphone because the Left and Right drivers are contained in the one ear-up with the Left driver in the up and staggered back position and the right driver in the down position closer to the ear. To hear, just place the ear-cup with the L/R drivers to your functioning left or right ear and the hollow ear-cup side to your deaf ear.  Once you get your hands on the 2E1, how to use it is simple and self-explanatory. The 2E1 comes to you plug-and-play ready to work, with no assembly or batteries required. All you would have to do is place the 2E1 on your head like any normal stereo headphone and plug it into your smartphone, computer, gaming console or any stereo/audio device and your one ear will hear in two-channel stereo.  

What I am doing with my various 2E1 builds:

I assemble my 2E1 single sided stereo headphones from high quality, new-off-the-shelf brand named components that I found work and fit together best for this project. I use on-ear stereo headphone magnet drivers from Koss (which are high fidelity rated) and Panasonic (which have XBS port boosted bass) that I modify and insert into premium branded passive noise canceling hearing protection earmuffs in my innovative "Flying Echelon™" staggered configuration. Like all earmuff hearing protectors, they are passive noise cancelling, designed to fit tightly but comfortably on the head and ears (please keep in mind that a tight fit is standard for all hearing protection earmuffs) over heads and on the ears of most adults and children (see sizes in descriptions below) and are all designated as one size fits most.

The hearing protectors that I'm converting into 2E1 stereo headphones were selected due to their sturdy, quality construction, comfortable and long lasting ear cushions that are great at blocking ambient noise so all you hear is the sounds coming from your speaker drivers. 

While all my 2E1 headphones have a form of the "Flying Echelon™" staggered drivers configuration, the "2E1 Pro Ears" model has the best and most acute version of the Flying Echelon configuration (see The "2E1 Pro Ears" specifications and illustration below on how my Flying Echelon speaker formation works) to provide the maximum aid for your one ear to hear stereo panning effects in high fidelity audio.

The "2E1 Pro Ears" and the "2e1 Semi-Pro" folding models all use the same Koss KSC75 high fidelity rated drivers in the Flying Echelon staggered drivers configuration.

The "2e1 Semi-Pro X" folding model utilizes Drop Studio's (formerly known as Massdrop) modified Koss KSC75X with built in inline one-touch remote control for controlling tracks and taking calls in the Flying Echelon staggered drivers configuration.

The "L1" and the "Ucho/Ear" Folding headphone models also use a form of the Flying Echelon staggered stereo drivers configuration for it's Panasonic XBS bass port boosted drivers. 

For added comfort I also incorporate vents into the "deaf-side"/hollow ear-cup to help keep the deaf ear cool and comfortable and for ease of differentiation as standard for all 2E1 models. 

The 2E1 can be easily modified with add-on attachments. You can easily add a boom microphone to attach to the 2E1 to convert it into a headset for gaming (feel free to ask my recommendation for which of my 2E1 headphone models is best for your gaming needs). For certain uses you may find that you may need to pair up the 2E1 with a headphone DAC/Amp because while analog components like turntables or stereo decks tend to not need to be paired up with a headphone amp (because they have it built in). Headphone amps are recommended if your 2E1 will be in use with weakly amplified devices like some soundcards, portable music players, smartphones, and other portable devices that tend to need a headphone amp pairings in order to get the best powered audio signal from high (20+ ohms) impedance headphones (this is generally true for all brands of high 20+ ohms impedance headphones). All the 2E1 headphone models can be made to be "wireless" by buying Bluetooth adapters to connect to a smartphone or any Bluetooth capable device. The "Semi-Pro X" model has a wired inline remote control and mic suitable for all general smartphone use. If the length of the audio cable needs to be longer for your needs you can extend it with a simple 3.5mm male-to-female audio extension cable. I would be happy to advise you on how to do all this. Also, in some cases, my 2E1's are also being used by people who have bilateral hearing (hearing in both ears) but want to keep one ear free to monitor the surrounding environment while listening to stereo in the other ear. I even think the 2e1 Semi-Pro or Ucho/Ear could ideally be used by those that are bilateral-hearing enabled because it produces full stereo to one ear while leaving their other ear free to monitor their surrounding environment! Contact me with these requests after your purchase.

I have created the following 2E1 headphone model variations to meet various budgets and usages. If you need advice on which 2E1 model is best for your planned usage please do not hesitate to ask for my recommendation. 

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The 2E1 "L1" & "Ucho/Ear" Headphone Components Description

Panasonic XBS drivers for 2E1 "L1" & "Ucho/Ear" headphones:

  • Panasonic made (RP-HT21) 30mm large diameter neodymium drivers with XBS bass boost port that magnifies low-frequency sound for full, robust pumped up bass response 
  • Panasonic drivers are arranged in my innovative "Flying Echelon™" configuration with Left driver in the up position and staggered back from Right driver in the down position nearer your ear attached to an acoustic diaphragm to produce an enhancing resonance effect to their audio signal. 
  • Compatible with all smartphones, computers, gaming consoles and audio devices that use a 3.5mm stereo jack output  
  • 3.5mm right angled jack for added durability to prevent shorting and the approximately over 3' to 4' long audio cable threads comfortably through clothing and bags 
  • 100 dB Sensitivity (The consensus is that exposure to sounds louder than 85 to 90 decibels over an extended period of time can contribute to hearing loss so please always keep your listening volume at a safe level.)
  • Soldered wired connection to the drivers are reinforced with a cushioned method for added wired connection durability
  • 24 Ohms Impedance (Headphones with high impedance (20+ ohms, approximately) tend to need more power to deliver higher audio levels. High impedance protects from damage caused by overloading and can also be used with a wider range of audio equipment but may require a headphone amp pairing for low voltage devices like portable music players, phones & wireless gaming controllers to achieve optimum audio performance.)
  • 1000 mW(*IEC) Power Handling Capacity
  • 16Hz - 22 kHz frequency response for natural-sounding mids and highs along with resonant bass and natural treble

Ucho/Ear Folding Portable headband:

  • The 2E1 Ucho/Ear Folding Portable headband is made from a converted SIDININC Ucho hearing protector 
  • One size fits most adults and children 
  • Durable stainless steel banded retractable headband and super soft foam ear-pads over shockproof ear-cups shell
  • Compact folding design
  • Passive ambient noise cancellation allows you to better hear your sounds at lower volume
  • Can be worn comfortably with eyeglasses, hearing aid devices 
  • Hollow ear-cup is vented for cooling comfort and can be used as a convenient storage compartment for rolling up and storing the cable inside
  • Free vents added on the ear-cup side with the speaker drivers to aid hearing ambient sounds if requested

The Howard Leight L1 Headband: 

  • The 2E1 L1 Headphone is made from a converted Howard Leight L1 model hearing protector and has a low profile design 
  • Telescopic adjustment features a steel wire core for added durability
  • Padded foam headband for long-wearing head comfort
  • Can be worn comfortably with eyeglasses, hearing aid devices 
  • Hollow ear-cup is vented for cooling comfort and can be used as a convenient storage compartment for rolling up and storing the cable inside
  • One size fits most adults and children 
  • The L1 is suitable for adults and is the ideal headphone for SSD children because of its super durable build quality and ease in cleaning/replacing the ear cushions
  • Snap-in designed super-soft replaceable ear cushions with Stay-Cool Air Flow Control technology allows for quick and easy cleaning and replacement 

 

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**THE "2E1 PRO EARS” & "2e1 SEMI-PRO FOLDING" HIGH FIDELITY HEADPHONE MODELS!**

After numerous requests made to me from single-sided deaf gamers, musicians and audiophiles for a high fidelity headphone incorporating the 2E1 system, I am pleased and thrilled to offer my highly praised 2E1 "Pro Ears" high fidelity rated, leather ear-padded Headphone! Put the 2E1 Pro Ears on and you're one ear will immediately feel and hear the difference and understand why it is so well received!

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I build my 2E1 Pro Ears model by converting the Altus Brand Pro Ears hearing protectors, that are made with genuine leather visco-elastic foam padded headband and ear seals. Completing my 2E1 Pro Ears headband conversion, I incorporate the legendary Koss KSC75 high fidelity stereo headphone drivers that I mechanically attach to an acoustic diaphragm that is arranged inside one ear-cup in my unique and innovative Flying Echelon™ staggered drivers configuration for aiding a single-sided deaf person's stereo panning perception.

How my Flying Echelon's™ Left/Right Driver formation works for my 2E1 Pro Ears in aiding hearing in stereo with one ear:

The way my Flying Echelon™ configuration works is based on the observed phenomenon that sound changes pitch depending on how close the sound source is to your ear. The drivers are affixed separate to the Pro Ears' ear-cup housing (hence "flying" designation) and are staggered (hence the "echelon" designation) inside the ear-cup of the Pro Ears headphone. With the Flying Echelon™ formation the Right side stereo driver is in the down position and closer against the ear and the Left side stereo driver is in the up position and recessed slightly back and away from the ear, thus making it easier for your one ear to have the ability to hear the stereo panning effect between the individual Left and Right drivers. The Flying Echelon also functions as a acoustic resonance enhancing diaphragm that the drivers are mechanically attached to inside the Pro Ears' ear-cup housing that works in harmony with the drivers to produce an effect that enhances the high fidelity drivers' dynamic audio performance (see my diagram illustration) causing the drivers to produce a sound that simulates the soft timbre of a tube amplifier making the audio output of the Koss hi-fi drivers sound warmer and softer. You have to hear it and feel it pumping to believe it! 


My 2E1 Pro Ears' Flying Echelon™ staggered configuration of the Left/Right drivers aids your one ear's ability to pick up the stereo panning effect between the Left and Right drivers. The 2E1 Pro Ears headphone incorporates the most acute Flying Echelon staggering of the Left/Right speaker drivers to produce the sharpest and most perceptible sound contrast between the individual Left/Right drivers housed inside the "Pro Ears" ear-cup that your one ear can perceive of all my 2E1 headphones. 

The Pro Ears' Flying Echelon acute staggering formation of the Left/Right drivers is specifically designed for the single-sided deaf listener to maximize their one ear's ability to hear stereo panning in music and sound localization effects in computer gaming to the maximum without distorting the high fidelity quality of the audio signal produced by the Left/Right drivers that you hear. Your one ear will be amazed at the hi-fi stereo sounds produced through the Koss' acclaimed hi-fi rated drivers in my Flying Echelon formation which are housed in this ultra-comfortable Pro Ears headphone. The 2E1 Pro Ears' Flying Echelon opens up new audio listening dimensions that have previously been denied to the SSD headphone user stuck with normal headphones where they can only hear one side or listening to stereo-to-mono mixed audio options. See and hear the 2E1 Pro Ears live reviewed while gaming to see why the 2E1 Pro Ears was called a game changer for the SSD headphone user! https://www.youtube.com/watch?v=0xPtMYL9bW8 & https://www.youtube.com/watch?v=aPfUUcP8CYg

The 2E1 "Pro Ears" Headphone's Components Description: 

  • Koss KSC75 High Fidelity Left/Right drivers housed in one ear-cup in the most acute "Flying Echelon™" configuration inside the one ear-cup (see Flying Echelon description and diagram above on how the Left/Right drivers are arranged inside ear-cup) with Left driver in the up position and staggered back and Right driver in the down position mechanically  to an acoustic diaphragm to produce an enhancing resonance effect to their audio signal. 
  • the "2E1 Pro Ears" Headphone is made from a converted from the veteran-owned Altus Brands "Pro Ears Ultra Slim" hearing protectors that are Made in the USA
  • Comfortable, snug fit, ProForm Leather Ear Seals with visco-elastic memory foam ear padding that are modularly crafted - which allows the option of easily replacing worn ear seals
  • Slim folding design
  • One size fits most adults and children.
  • Hollow ear-cup like all 2E1 headphones have added vents to the "deaf" ear-cup to help with ear cooling and ventilation and can be used as a convenient storage compartment for rolling up and storing the approximately over 3' to 4' long audio cable inside
  • Can be worn comfortably with eyeglasses, hearing aid devices 
  • Compatible with all Smartphones, computers, gaming consoles and audio devices that use a 3.5mm stereo jack output
  • Soldered wired connection to the drivers are reinforced with a cushioned method for added wired connection durability
  • 60 Ohms Impedance (Headphones with high impedance (20+ ohms, approximately) tend to need more power to deliver higher audio levels. High impedance protects from damage caused by overloading and can also be used with a wider range of audio equipment but may require a headphone amp pairing for low voltage devices like portable music players, phones & wireless gaming controllers to achieve optimum audio performance.)
  • 101 dB SPL/1mW Sensitivity (The consensus is that exposure to sounds louder than 85 to 90 decibels over an extended period of time can contribute to hearing loss so please always keep your listening volume at a safe level.)
  • 15-25,000 Hz frequency response
  • Total Harmonic Distortion (THD) 0.2 %
  • Computer-optimized neodymium, iron, and boron rare-earth magnet structures deliver amazing clarity at any volume and offer deep bass performance for an extended frequency response
  • Titanium-coated drivers deliver accurate sound reproduction with little distortion
  • Passive ambient noise cancellation allows you to better hear your sounds at lower volumes
  • The 3.5 mm audio plug is angled for durability and is compatible with all smartphones, computers, gaming consoles and audio devices that use a 3.5mm output jack
  • Enjoy greater volume despite low-voltage portable devices 


I'm also pleased to announce the 2e1 Sem-Pro folding models that also incorporate the same Flying Echelon™ staggering of the Koss KSC75 hi-fi drivers principal as the 2E1 Pro Ears model but the staggering of their drivers configuration for aiding a single-sided deaf person's stereo panning perception is not as pronounced as in the 2E1 Pro Ears but they still produce the full effect of two-channel hi-fi stereo audio to the one ear. Both 2e1 Semi-Pros are the ideal 2E1 models for portable smartphone use with the 2e1 Semi-Pro X model having a wired in mic/remote. 

As a free option for the "2e1 Semi-Pro Folding" models, I'll add additional vents to the ear-cup housing the speakers to let in ambient sounds to help you better monitor your immediate environment (for example, so you can better hear traffic sounds around you while walking about wearing the "2e1 Semi-Pros", etc.). Be aware the speaker-side vents will allow others to also hear what you are listening to if played at higher volumes (like if you are using them in a library or airplane). Contact me with these requests after your purchase.

The 2e1 "Semi-Pro" and "Semi-Pro X" Folding Headphone's Components Description:

  • Lightweight and compact folding design makes the "2e1 Semi-Pro Folding" models ideal for listening while travelling, going to the gym or any portable smartphone use 
  • Compatible with all audio devices that use a 3.5mm stereo jack output
  • 2e1 "Semi-Pro" use the same Koss KSC75 High Fidelity speaker drivers as the "2E1 Pro Ears" 
  • The "2e1 Semi-ProX" uses the The Drop/Massdrop modified KSC75X High Fidelity drivers with inline remote/mic ideal for smartphone use
  • Compact version of the "Flying Echelon™" configuration with the Left driver in the up position and staggered back from the Right driver which is in the down position mechanically attached to an acoustic diaphragm to produce an enhancing resonance effect to their audio signal
  • Passive ambient noise cancellation allows you to better hear your sounds at lower volume
  • Free vents added on the ear-cup side with the speaker drivers to aid hearing ambient sounds if requested
  • Soldered wired connection to the drivers are reinforced with a cushioned method for added wired connection durability
  • Headphone is a converted hearing protector made by G&F which is of high quality sturdy parts with the cushions made of 100% cut resistant fiber 
  • One size fits most adults and children
  • Hollow ear-cup like all 2E1 headphones have added vents to the "deaf" ear-cup to help with ear cooling and ventilation and can be used as a convenient storage compartment for rolling up and storing the approximately over 3' to 4' long audio cable inside
  • Can be worn comfortably with eyeglasses, hearing aid devices 

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All donor component parts used in my 2E1 models are guaranteed to function and to be brand-new-out-of-the-box and are covered by the eBay Money Back Guarantee. The 2E1's are personally hand assembled by myself in my NYC workshop to the highest build quality but please forgive any superficial blemishes that may arise from the handcrafted build process. Additionally, for as long as I am making my 2E1s I will provide personal lifetime technical support and also repair or replace the 2E1s purchased from me for free or at cost if they ever malfunction or get damaged (per my discretion, offer not applicable to ear cushion replacements and you will need to pay for shipping both ways), so please save your receipts! 

Please allow me about a week to build and ship the 2E1 stereo headphone to you (I also happily ship internationally!). The available default colors are those shown in the pictures but just in case the default colors are not available from my suppliers at time of purchase I may substitute with another similar unisex color (though, this has yet to happen). 

For those people who are sensitive or concerned about chemical smells, I do not use glues of any kind in my 2E1 build. The 2E1 headphone's Flying Echelon embedded speaker drivers are secured inside the ear-cup via a pure mechanical build and are fully serviceable and customizable. For those sensitive about their SSD condition I do not brand the 2E1 headphones in any way to indicate it is for use by a single-sided deaf person. 

The Single Sided Deaf community has a major need for high fidelity stereo headphones that is not currently being fulfilled by any major headphone manufacturer so I contend my self-developed 2E1 stereo headphones can service that need. Positive reviews for the stereo headphone drivers and the hearing protection earmuffs that I convert into my 2E1 stereo headphones are widely attested to online. If you want to know ahead of purchasing the 2E1 headphones how well all my 2E1 models will sound and fit, then all you have to do is look up the online reviews for both the fit of the individual hearing protection earmuffs and the sound performance of the stereo headphones that have been submitted by a multitude of reviewers over the years. I contend that my 2E1 headphones can match normal "bilateral" stereo headphones in audio performance because I'm converting the well reviewed "bilateral hearing" stereo headphones from the selected major brands (Koss and Panasonic) into my 2E1 headphones to serve the single-sided deaf community's audio headphone needs. 

If you have any questions please feel free to ask me either here on eBay or on Reddit under "/u/Biblos_Geek" where you can also follow me to be informed of any 2E1 special deals or promotions I announce there (I RECENTLY POSTED MY SALES DISCOUNT CODES ON REDDIT THAT WILL BE GOOD THROUGH LABOR DAY SO FOLLOW ME THERE FOR THE CODES!). I'm constantly revising existing 2E1 headphone designs and adding new models so please make sure to add this page to your eBay watch list! 

I am very grateful, honored and humbled by the positive reviews my 2E1 stereo headphones are receiving (some of which I screenshot). Making my 2E1s has been a great healing therapy for me in my own recovery from my unilateral hearing loss so I'm pleased to build my 2E1 "Two Ears in One" true stereo headphones for our single-sided deaf community. 

Thank you for allowing me to be of service to the unilateral hearing loss (UHL) / single-sided deaf (SSD) community!