It's headphone time again; probably my favorite device to review. Why? Because it's personal and aids in slacking, as I don’t have to move around too much. But headphones are no joke; serious high audio grade ones need special attention. I plan to give just that to these new Koss headphones I have received: the Koss QZ Pro. These are noise cancellation ones, so let’s see...
Design and Features
These are circumaural (closed back design) with cushion padding all over the inner side of the headband and rims. Weight-wise they are quite light; this is good for ergonomics. The cans have an aluminum finish, with a mild reflective smooth surface. The rest of the body parts are black, again with the typical plastic smooth finish.
The right enclosure has the on /off switch. 2 AAA batteries are required to use the NC facility. Volume control is a simple slider control on the cord itself. The Koss branding is on the cans, but doesn’t scream for attention. All in all it's a decent looking pair of headphones.
The physical structure allows the user to fold in the cups inwards for carrying around, though one must make sure he/she is turning the cups the right ways, or they might break. I didn’t experiment too much.
The sensitivity is low, I feel, at 90 dB SPL/1mW. Impedance is normally valued at 32 ohms, like most headphones these days, while the frequency range is 4Hz – 20 KHz.
there are lot of old cans in the indian white market, suggest a good pair of cans that fall in the 2k-2.5k range and have inbuilt preamps for computer wear and dont have miles of wiring 
