Fluid Audio FX8 8-Inch Coaxial 2-way Studio Reference Monitor， Black<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Frequency response: 35 Hz - 22 kHz </span></li><li><span class="a-list-item"> Polarity: Positive signal at + input produces outward LF one displacement </span></li><li><span class="a-list-item"> Input impedance: 20 k ohms balanced， 10 k ohms unbalancedInput sensitivity: 85 mV pink noise input produces 95dBA output SPL @ one meter with volume control at maximum (102dB Max SPL) </span></li><li><span class="a-list-item"> Power: 115V ~50/60 Hz or 230V~50/60 Hz user switchable. </span></li><li><span class="a-list-item"> Protection: RF interference， output current limiting， over temperature， turn on/off transient， subsonic filter， external mains fuse </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41FbcfeaaxL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41OUHq4dtwL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41ovZ3tNs3L.jpg" noproxy>