AKG · Open-back · Late 1970s–1984
The K 240 Sextett is named for the six small passive membranes around each driver, which AKG said combined the advantages of open and closed headphones. AKG's 1981 brochure called it a milestone of its research into spatial hearing, promising the illusion of being in the concert hall. It's usually dated to 1975, it was on sale by 1981, it was made in Austria, and the K 240 Monitor replaced it in 1984. Collectors split it into early, middle and late production runs, EP, MP and LP, told apart by the baffle and dust screen under the pads rather than anything you'll see in a listing. One badge confuses sellers. It reads FOR OUTPUTS 4–600 Ohms, the range of amps it works with, not its impedance.
Before you plug in
The elastic straps of the self-adjusting headband go slack, and the foam and dust screens inside the cups break down. The grilles can crack if they're pried off for cleaning.
New to used headphones? How to check a used pair covers pads, cables, channel dropouts and fakes, and impedance and your amp explains what will drive it.
Buying guide
We'd buy the Sextett titled tested at $252 delivered from a 99.4% seller, right in the $240–260 band, and its photo shows the silver cup rings and the cable's 6.3 mm plug. Only three of the at least 6 for sale carry no warning, so that band isn't a market read, and of the rest, two share one title across different sellers and one doesn't show its seller, so check feedback and history before buying those. The German auction at $179 delivered with no bids is the cheapest way in, and we'd stop around $200 delivered, since it isn't titled tested. AKG's FOR OUTPUTS 4–600 Ohms badge gives the range of amps it suits, and its own impedance isn't documented, so plan on a hi-fi headphone jack or a headphone amp. Look for the silver cup rings in the photos, since plain cups mean a Monitor or a later K 240, check that the elastic straps under the headband still pull it down snugly, and don't pay extra for an EP, MP or LP claim, which collectors say takes a look under the pads to confirm.
$179.19est. delivered
The lowest delivered Sextett here at $179 at the current bid, from Germany with $39 shipping, and the photo shows the silver cup rings. It isn't titled tested and has no bids yet, so it will climb, and we'd stop around $200 delivered since a tested pair asks $252.
Legendary! AKG K-240 Sextet MP High End Vintage Audiophile Headphones
$251.59est. delivered
Titled tested and made in Austria at $252 delivered, right in the middle of the band. The photo shows the silver cup rings and the cable's 6.3 mm plug.
AKG K240 Sextett 4-600 Ohms Stereo Headphones-Vintage 70s Made in Austria Tested
$251.59est. delivered
Titled tested, and the wired-in cable ends in a 6.3 mm plug in the photo, so it goes straight into a hi-fi headphone jack or amp. Ask the seller to confirm the headband straps still pull it down snugly.
AKG K240 Sextett 4-600 Ohms Stereo Headphones-Vintage 70s Made in Austria Tested
Delivered prices include shipping as eBay quoted it to a US address on Oct 14, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.
Snapshot
Checked . Some may have sold.
Delivered prices include shipping as eBay quoted it to a US address on Oct 14, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.
Used$179.19est. delivered
$139.99 + $39.20 shipping
Auction · no bids yet · ends in 3d 21h
Good buy
Titled MP. Auction with no bids yet, and it will climb. Ships from Germany.
Seller: olk_67
100% positive
Used$251.59est. delivered
$239.99 + $11.60 shipping
Buy It Now$239.99
Good buy
Titled tested. Photo shows the silver cup rings.
Seller: flipperpickeraz
99.4% positive
Used$256.78est. delivered
$249.00 + $7.78 shipping
Buy It Now$249.00
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Our take
Original box per the title. The photo doesn't show the cups, so ask for the silver rings.
Seller: trob919
100% positive
Used$177.70est. delivered
$165.00 + $12.70 shipping
Buy It Now$165.00
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Check the seller
Titled tested. Same title as another seller's listing. Compare photos and seller history.
Seller: reservoirresale
100% positive
Used$246.09est. delivered
$239.00 + $7.09 shipping
Buy It Now$239.00
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Check the seller
Titled LP, tested, with box. Seller not shown, so check feedback on the item page.
Seller: Seller on eBay
Check feedback on the listing
Used$299.95delivered
$299.95 · free shipping
Buy It Now$299.95
Check the seller
Titled tested. Same title as another seller's listing, from a 98.4% seller.
Seller: maggica21_3
98.4% positive
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