ohm impedance ohm impedance??? What is this when it comes to headphones? What is the most important?...the frequency response?
impedance isn't realy a problem with most head phones. Starts to become a bigger problem when using high-end phones on valve headphone amps (which i assume your not). Frequency response is very important when listning at "quiet" volumes...but when your in a DJ booth with the monitors very loud and the headphone volume very high it becomes less important (as your hearing sensitivity deteriorates very quickly. also companies will state frequeny response at agiven db, which will probably be quiter than you'll be using them!). Design of the "cups" and the "head band" i feel is much more important. make sure you audition new head phones...easy as.