Asus 945GC/ICH7 LGA775 MAX-4GB DDR2 Mitx Pci Gbe Speaker Dimensions 40mm Array Microphone Suppresses ambient noise up to 15dB Dynamic Range 125Hz ~ 20KHz Sensitivity (S.P.L) 117+- 3dB at 1mW / 1KHz Frequency Response 20 ~ 20KHz Output S.P.L -10dB