JBL Loft 40 Bookshelf Speakers (Pair) Low Frequency Transducers: Two 100mm (4") PolyPlas cones, magnetically shielded High Frequency Transducer: 25mm (1" ) soft dome on EOS waveguide, magnetically shielded Power Handling: 10  150 watts Nominal Impedance: 8 Ohm Sensitivity: (2.83V/1m) 90 dB Frequency Response: 55Hz-20kHz Power Handling (Recommended): 10-125 watts Sensitivity (2.83V/1m): 89dB High-Frequncy Transducer: 25mm (1") soft dome on EOS waveguide Low-Frequency Transducer: 130mm (5-1/4") PolyPlas cone Connector Type: Binding post 10  125 watts suggested amplifier range: JBL engineers designed the Loft40 bookshelf speakers to produce precise, exceptional sound from a receiver or amplifier capable of delivering up to 125 watts. 5-1/4" (133mm) PolyBass woofer: Paper produces the most natural sound of all driver materials. Weve reinforced the Loft40s paper woofer cones with a proprietary polymer that provides additional stiffness and damping to the cone surface. These qualities provide the listener with tight bass and extended low frequencies without breakup or distortion. 1" (25mm) soft dome tweeter with EOS waveguide: The Loft40s tweeter features a 1-inch (25-millimeter) soft dome with high sensitivity and fast transient response for accurate high-frequency reproduction. The tweeter integrates with an EOS (Elliptical Oblate Spheroidal) waveguide, giving high-frequency sounds a wide, consistent listening window. The result is an incredibly broad stereo image across a huge listening area. FreeFlow port technology: A rear-firing FreeFlow port is acoustically matched to the Loft40s woofer to move air out of the speakers cabinet. Youll get extended bass response with low distortion, adding power to your music and excitement to your movie soundtracks. Straight-Line Signal Path (SSP) design: The ideal path from input to components to transducers is a straight line. The Loft40 takes that path. Its Straight-Line Signal Path (SSP) technology preserves the clarity, detail and dynamics of your favorite audio content. Accurate frequency response: The Loft40 doesnt over-emphasize or under-emphasize any sounds. With a frequency response of 55Hz ? 20kHz, it reproduces a true, full sound range from deep bass tones to ultrahigh frequencies.