Mistral DT-307S 6 Ohms 30W x 2 Hifi Bookshelf Speakers - Red Woofer: 4"; Tweeter: 0.75" Power Handling: 30W x 2 Impedence: 6 Ohm Sensitivity (2.83V/1m): 87dB Frequency Range (+2dB): 75Hz~20kHz