This is the classic Koss Pro / 4XTC Studio Quality Stereophone. As far as I can tell theyve never actually been used. They are still in the original inner box and wrapping packaging. So for this reason I assume that they work fine. Youll notice I havent removed them from the inner packaging for the listing photos. There does however only appear to be one jack in the box (it says 2 are included on the outside box info). The main / outer box is in OK-to-good condition. A little worn on the corners / edges, one slight tear on one of the corners, and a slight mark in one corner where I presume a price tag used to be, but the box is still solid and functional. I gather that these headphones were quite the thing when they came out in the early 90s. So much so buyers were offered a lifetime warranty. Koss released later versions of these headphones that never quite generated the same excitement, so I guess this pair really are classic! For that reason they will make a fantastic gift for all you audiophiles out there! The box measures: 8.25 wide x 8.5 height x 4.25 depth. Box + headphones weigh 1lb 4oz. All our items are well packed, tracked and fully insured. It will arrive to you in the exact condition as pictured. **Koss Pro 4XTC Stereophones Mint In Box, Vintage Headphones in Original Box, Retro 1990s Audio Equipment, Audio Lover Collectible, #CE0834**

Vintage Koss Headphones Pro/4X Profession Stereo HeadPhones Not Tested.Made in USABuilt to last ones lifetime, with careful useDouble piezo-electric tweeter elementAdjustable hoopImpedance:250 OhmaFrequency response: 5 - 4000HzSensitivity: 102 dB SPL/1mW.THD: less than .5% (most speakers have 1% to 5%)Cord length: 3 meters, coiledPayment:eBay now accepts many different methods! Please choose the one which is most convenient for you.Payment to be received within 2 days of purchase; otherwise, an unpaid item case may be opened.Shipping:This item will be shipped USPS Priority Mail or USPS Ground within 3 days of receiving your payment. Were happy to combine shipping, just send us a note Before you check out!Returns:Returns are accepted for reasons of damage or not as described. The original tags intact (If applicable) and in original Condition.Original shipping cost paid by buyer at time of checkout WILL NOT be refunded (Limited exceptions may apply).The item must return to the seller in same condition as sent from seller before a refund will be given. Other:We do our best to list items as accurately as possible, but occasionally we may make a mistake. Please send us a message if you think we overlooked something.Actual colors may differ slightly from photos due to different monitor settings, camera exposure settings and lighting conditions.Please examine and zoom in carefully as flaws may not be visible from afar.Please review all pictures for additional details and as part of the description of the item.

Great classic headphones with a very wide frequency range. The box has some tears but is in overall good shape.

A vintage pair of Koss headphones. Tested on a cheap Magnavox stereo and they did seem to work well. Age has deteriorated the foam in between the earpad and the headset. Selling them in as is condition as it is an old electronic device.

A vintage pair of Koss headphones. Tested on a cheap Magnavox stereo and they did seem to work well. Age has deteriorated the foam in between the earpad and the headset. Selling them in as is condition as it is an old electronic device.

KOSS PRO/4XPLUS HEAD PHONES.

Vintage KOSS Pro 4X Plus Digital Ready Headphones! Working R3.

Vintage KOSS Pro /4X Plus Digital Ready Headphones! Working, Excellent Condition.

These are tested and working. The adhesive backing the ear surround is starting to fail.