16EnglishModel X300A WirelessDesign Two-way bass reflexDrive units Uni-Q driver array:HF: 25mm (1in.) vented aluminium domeLF/MF: 130mm (5.25in.) magnesium/ aluminium alloyFrequency range (-6dB) 49Hz - 45kHzFrequency response (±3dB) 58Hz - 28kHzMax peak SPL 104dBAmplifier class Twin Class ABAmplifier power LF: 50W HF: 20WAC power input US/JP versions: 100-120VAC 50/60HzEU/UK versions: 220-240VAC 50HzChina version: 220-230VAC 50HzAnalogue input AUX: 3.5mm stereo jackDigital input USB: Mini USB Type B connectorResolution Up to 24-bitSampling rate Up to 96kHz, depending on source resolutionWireless standard IEEE 802.11b/gWireless frequency band 2.4 GHzNetwork connection 802.11b/g wireless100 Base-T, RJ45 EthernetWireless network streaming DLNA: V1.5 Digital Media Renderer (DMR)AirPlay: AirPlay works with iPhone, iPad and iPod touch withiOS 4.3.3 or later, Mac with OS X Mountain Lion (10.8.0) orlater, and Mac or PC with iTunes 10.2.2 or laterControl Balance controlSystem volume controlInternal volume 4.7LDimensions (H x W x D) Without heatsink:280 x 180 x 215 mm (11.0 x 7.1 x 8.5 in.)With heatsink:280 x 180 x 243 mm (11.0 x 7.1 x 9.6 in.)Weight 7.5kg per speakerSpecificationsKEF reserves the right, in line with continuing research and development, to amend or change specifications. E&OE.