Infinity Primus PC250 2 Way 5.25 Center Ch Spk (Sold Individually) Sold Individually Frequency Response (3dB): 80Hz - 20kHz Recommended Power Amplifier Range: 10 - 150 Watts Sensitivity (2.83V @ 1m): 90dB Crossover Frequency(ies): 3,000Hz; 24dB/octave