Atlantic Technology 171LR Bookshelf Speakers

Model 171LR Front: Cabinet (H/W/D) 5.5 x 13.5 x 6.5"; Drivers: 1" Tweeter, 2- 4" Mid-Woofers, Internal Crossover; Freq Response: 190Hz - 20 kHz ± 3 dB; 8 Ohm Impedance (4/6/8 Ohm Receiver compatible); Sensitivity: 87 dB.