The Sennheiser HD 660S2 headphones are discounted to $500 at Crutchfield until April 20. Go the extra mile for your audio with a pair of Planar drivers!

If you're looking for open-backed headphones with big bass then Sennheiser's second-gen HD 660S are well worth a look When you purchase through links on our site, we may earn an affiliate commission.

Sennheiser itself offers several worthwhile alternatives. Of the ones not already mentioned above, the HD 560S ($230) and HD ...