Monitor Audio Platinum PL100 is a pair of very open, full and well balanced soundstage speakers without privilege on any sound spectrum. The bass is good enough although they are standmount speakers. The ribbon C-CAM allows high resolution and detail of sound reproduction yet there is no harshness. SPECIFICATION Frequency Response 42 Hz - 100 KHz Sensitivity (1W@1M) 88 dB Nominal Impedance 4 Ohms Maximum S.P.L (Per pair in room) 112.6 dBA Power Handling (RMS) 120 W Recommended Amplifier Requirements (RMS) 50 - 120 W Bass Alignment Ported - HiVe® II Technology Mid / H.F Crossover Frequency 2800 Hz Drive Unit Compliment 1 x 6.5" RDT Bass/mid-range driver 1 x C-CAM® high frequency ribbon transducer External Dimensions of Speaker (HxWxD) 370 x 225 x 285 mm (149/16 x 87/8 x 111/4 inch)