Adorama offers the Audio-Technica ATH-M40x Professional Studio Monitor Headphones
, bundled with the FiiO Fujiyama Headphone Amplifier
, model no. E06, for $81.95
with free shipping
. (The amplifier will appear in-cart automatically.) That's $19 below the best price we could find for these items purchased separately elsewhere. The headphones feature a 15Hz to 24kHz frequency response, 47-ohm impedance, 40mm drivers, two detachable cables (one coiled and one straight), collapsible design, and 90-degree swiveling ear-cups. The amplifier can drive headphones from 16- to 150-ohms and features a 10Hz to 100kHz frequency response, USB rechargeable battery, bass boost, and 3.5mm jack.