$255 $500
eBay with Sennheiser has the Certified Refurbished Sennheiser HD 660 S Audiophile Open Back Over-Ear Dynamic Hi-Fi Stereo Headphones for $300 - 15% off with coupon code SAVEONCR15 in cart = $255 with free shipping.
$255 retail: $500
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Adorama

Sennheiser HD 660 S Open Back Dynamic Hi-Fi Stereo Headphones at Adorama

Posted 11/26/2021 in Wired Headphones
$299 retail $500
Adorama

Sennheiser HD 660 S Open Back Dynamic Hi-Fi Stereo Headphones at Adorama

Posted 12/04/2020 in Wired Headphones
$319 retail $500
Price History