KRK KNS-6402 Over-Ear HeadphonesExperience great sound with the KRK KNS 6402, a pair of circumaural, closed back headphones that won't break the bank. With 40mm drivers that deliver a 10 Hz to 22 kHz frequency response, these headphones give you an accurate accounting of your music across the frequency response. Use them to block out annoying sound too: they're good for up to 26 dB of passive noise reduction. An impact resistant plastic construction renders the headphones both