1. Promick

    Koss K-500 vintage headphones

    After all, the company Koss during the leadership of its founder John Koss was truly great, and then the optimizers came and it turned out what happened. Otherwise, how to explain the fact that the company could produce small-scale batches of headphones for "human testing". The case in the...
  2. C

    Koss KSC75 vs Porta Pro?

    I've been looking at these two headphones as the best "beginner" audiophile headphones because of the low price. Does anyone know how they differ in sound? From what I've heard so far, the Porta Pros sound relatively warmer.
  3. Zerousen

    [WTS] MMCX Modded Koss KSC75, Sennheiser PX200

    Hi guys, I'm back with a few more things to sell, looking to save up some money so I can go visit family in July. I have three sets of MMCX Modded KSC75s and a PX200 in great condition, I have 3 more sets of KSC75s available that I will be modding a little later for those that don't mind waiting...
  4. Zerousen

    [WTS] MMCX Modded Sony MH755, MMCX Modded Koss KSC75, MMCX Modded Moondrop Crescent, Removable Cable Modding Services

    Looking to sell a few things in order to fund some other projects. Shipping fees within the US is included, international shipping will cost a flat $10 fee. I have been doing these mods for almost two years now, and have just recently received my supplies and am now able to continue my mail in...
  5. Asahi Templar

    FS-Koss Massdrop ESP/95X electrostat headphones with Stax CPC-1

    Up for your consideration is the incredible Koss ESP/95x electrostatic headphones. I am the 2nd owner but the first owner barely used them. I got them about 2 months ago and they have been my main headphone for most of that time. They have been used almost every day since. With EQ these are...
  6. Massdrop x Koss ESP/95X Electrostatic System

    Massdrop x Koss ESP/95X Electrostatic System

    "A revival of the standard-setting ESP/950 released by Koss in 1990, these headphones bring electrostatic quality into a whole new price bracket."
  7. S

    SOLD! Massdrop x Koss ESP95X

    Selling a Massdrop x Koss ESP95x (note: it's the 120v version). I'm the original owner and have had them for three months. They work perfectly and sound great. I recently purchased a higher-end pair of headphones and these don't get much use anymore. It comes with headphones, energizer and...
  8. Bullpride

    <<PRICE DROPS>> Spring Cleaning: Fiio X3 mkII, AKG K545, Koss ProDJ200

    Finally got around to cleaning out the closest and found some budget gems. Oppo HA-2 SE: $200. Lightly used and mostly at my desk. Original Package and most of the connectors. Micro USB to Micro USB and Micro USB to lightning found but not pictured. SOLD to mattmc1228 NAD HP50: $90 In Great...
  9. Asahi Templar

    FS-Massdrop Koss ESP 950/x Electrostatic System

    Up for your consideration is a koss esp 95/x Electrostatic System. I am the 2nd owner but I have only used them for a hour and a half. The previous owner had them for a little under a year and kept them in drawer when not in use. I don't think he used them much at all because they are near mint...
  10. J

    My favorite budget headphones I had ever used

    Hello. This is my first post. I wanted to compile a list of the greatest headphones I have ever used. I no longer own any of them, due to my nature of being a tinkerer. Important to know with this post is these following headphones (aside from the top headphone on this list) are like digging...
  11. ephrank

    FS KOSS Porta Pro [AUS]

    For sale is a pair of Porta Pro in excellent condition. The ear pads are brand new pleather replacement pads Includes original box and carrying pouch AUD $40 ONO. Pick up in Sydney
  12. Geezer Rock 001

    SOLD Koss/Drop ESP 95X NIB. SOLD

    SOLD A pair of Koss electrostatic headphone with amp/power supply. New and in a sealed box. Never used. Drop has moved the price back up to $500 plus freight. Your chance to get them for the old price. They have not been registered with Koss so they are eligible for the life time...
  13. takato14

    WTB: KOSS ESP/10

    In the title. I just replaced the cable on mine to find that it has a channel imbalance. oof. Any condition, with or without energizer. pls let someone here have this lmao
  14. takato14

    KOSS KDE/250 (LNIB)

    These are a very difficult one for me to part with. It was orignally a very high priced product in Koss' lineup compared to their usual fare, filling in the price gap between the ESP/950 and any other wired headphone in their inventory. I had been interested in them since I started playing the...
  15. ilikebananafudge

    FS: Koss ESP/95X (CANCELED)

    *** THIS SALE HAS BEEN CANCELED *** I bought these in February of 2019. I've probably used them for about ~100 hours, but they're in like new condition. They sound excellent, but I'm obsessed with my Focal Clears. Serial number MD-00126. I'm not looking for trades. Price includes paypal fees...
  16. Sherman

    Koss HV/X replacement pads?

    Koss finally stopped selling replacement pads for my HV/X. The pads were great except that they literally disintegrate after a few years. The original pads came with adhesive on them which stuck to the smooth plastic of the headphone. Does anyone know what pads might fit this headphone?
  17. Asahi Templar

    For Sale- Koss Pro4s Closed Back Headphone

    Up for your consideration is a Koss Pro 4s studio closed back headphone. This is one of Koss highest end headphones and was designed for studio usage. It sells new for 139.99. It includes a great lifetime warranty and is easily the best built modern Koss headphone. It is quite nice sounding...
  18. mightytison

    Massdrop Koss ESP/95X Electrostatic System **SOLD**

    For Sale is my Massdrop ESP/95X Electrostatic System. Just delivered this morning and I tried them out, but they are just not for me. There are many great reviews for these so I highly suggest you read up on them. They have less than 2 hours on them and are in like new condition. Price includes...
  19. Zerousen

    [WTS] MMCX and Cable Modded Sony MH755, modding services

    Hi guys, got another batch of modded MH755's for sale here. I have 4x cable modded units and 4x detachable cable modded units. I am asking $35 shipped within the US for a cabled pair, and $55 shipped for an MMCX modded pair with cable included ($45 shipped if you would rather use your own...
  20. davstev

    Electrostatic headphones - membrane coating loss?

    HI Folks, Not too long ago, I bought a near-mint, still boxed pair of early 70s, Koss ESP-9 electrostatic headphones. Obviously old, but in good cosmetic shape & seems barely used. After several weeks I found the time to hook them up. I wired the E-9 energizer to the back of my Kenwood 700M...
  21. DocBox

    Koss PortaPro Classic Headphones

    I'm selling a set of Koss PortaPro Classic Headphones, w/ fake leather pouch. Item is in good condition. A very light pair of well-respected, budget on-ear headphones! Looking for £25 shipped to the UK, ono. Happy to ship to EU, though this will incur an additional fee. Any questions, please...
  22. ksu06

    SOLD: Koss ESP950

    For sale is a basically new Koss ESP950. I purchased it brand new from Massdrop, but the sound is not for me. Total time of usage is under 6 hours. Includes all original cables, amp, power supply, leather case and packaging. Asking $450 or best offer, including CONUS shipping and PayPal fees.
  23. P

    Koss Portapro amp tips

    Hello everyone! I am a new member in this forum, thank you for having me and I love what you guys are doing here! I am slowly coming into the audiophile world but by far can't call myself one. My first glimpse into this world was with Sennheiser px-100ii phones(loved them) and after these I got...
  24. B

    KOSS KSC75 vs Soundmagic E10C

    I am in a need for a new daily driver after I lost my E10Cs a few days ago and I've heard quite a bit of good things about the Koss but how do they compare to the E10Cs. I liked them well enough for outside stuff because of the decent sound and reasonable price. The Koss cost less and supposedly...
  25. DozerCSX

    For Halloween: Re-animating the JVC HA-RX330

    So, for Halloween, I decided to do a small audio project - to BRING the DEAD back to LIFE! Perhaps worse than dead, take a dull, lifeless sounding headphone and turn it into a real killer... The Victim: I found a clearance JVC HA-RX330 at my local Fry's for the undead price of $4.99! I snatched...