The PROline 750 headphones ($429) have some impressive specs, the .65 lb. (without cable), closed-back, foldable headphones boast a frequency response of 8 Hz - 35 kHz. Their impedance is 40 ohms and they have a maximum sound pressure level of 94 dB. The headphones feature a 40 mm titanium-plated driver and MU metal shielding. Titanium drivers are the stiffest type available and they offer precise sound reproduction. The headphones include two detachable cables with gold-plated 1/4-inch jacks, a gold-plated 1/4-inch-to-mini adapter, a spare pair of speed-switch velvet ear pads, a demo CD, an instruction manual, and a transportation bag.