These Sennheiser HD 650 headphones offer the listener a warm high-definition sound that is elevated with mid-bass and is very easy on the ears. The Sennheiser HD 650 headphones feature an open and dynamic burst of sound. They are silver and black in color. They fit comfortably on the head and are made with an impedance of 300 Ohms and a frequency response range of 10 Hz to 39.5 kHz. Users will appreciate the warm highs that the Sennheiser HD 650 headphones provide, along with the detailed and accurate bass sound. The cable measures over nine feet in length for increased mobility. Additionally, the Sennheiser HD 650 over-the-head headphones are a reasonably-priced HD headphones solution for users who have a computer with a substandard sound card and do not want to spend a large amount of money on a new sound card or expensive speakers. Unlike the makers of many other headphones, Sennheiser does offer a number of replacement parts for these Sennheiser HD 650 over-the-head headphones, in the event of accidental damage. These headphones are a suitable choice for beginners venturing into their first HD headphones listening adventure, as well as for people who enjoy music but do not need to hear each and every nuance of a recording. 

Technical Specifications 

Systems with narrow tolerances (+/-1 dB), hand-picked in pairs 
Highly optimised magnet systems for minimum harmonic and intermodulation distortion 
High-quality titanium/silver finish 
A specially developed damping element, made from fine acoustic metal mesh, ensures a precise damping over the entire diaphragm surface, highly constant in all climates. 
Specially modulated connecting cable (detachable) made from highly conductive OFC copper, Kevlar-reinforced, with very low handling noise, i.e. low structure-borne sound sensitivity 
Extremely lightweight aluminium voice coils ensure excellent transient response 
Gold plated 0.25"jack plug with adaptor lead to 3.5 mm jack plug 
Nominal impedance: 300 
Contact pressure: ca. 2,5 N 
Weight w/o cable: ca. 260g 
Jack plug 6,3/3,5: mm stereo 
Transducer principle (Headphones): dynamic, open 
Ear coupling: circumaural 
Cable length: 3 m 
Frequency response (headphones): 10 - 39500 Hz 
Sound pressure level (SPL): 103 dB 
THD, total harmonic distortion: 0,05 percent