ok sorry for asking this question.. seems like there are a lot of them but i have no real knowledge on this subject... i have icemats, Frequency Response 18Hz-28KHz Input Impedance 40 ohm Sensitivity SPL@1kHz, 1V rms: 99 - 104 dB Connector 3.5mm/ USB Ear Coupling Circumaural Cord Length 9 feet Micro...