Product highlights1" LTS (Linear Travel Suspension) titanium diaphragm tweeter with Tractrix horn 6-1/2" Cerametallic cone woofer with rigid and lightweight voice coil frequency response: 45-25,000 Hz (3dB) power handling: up to 100 watts RMS (400 watts peak) sensitivity: 96 dB impedance: 8 ohms compatible bass-reflex design with rear-firing Tractrix port magnetically attached grilles for a clean, streamlined look ebony vinyl finish with scratch-resistant design 5-way binding post speaker terminals two sets of input terminals allow bi-amping or bi-wiring 8"W x 15-3/4"H x 11-7/8"D weight: 16 lbs. each warranty: 5 years What's in the box2 Bookshelf loudspeakers 2 Grilles (installed) 8 Self-adhesive rubber feet 4 Terminal jumpers (installed) User Manual Important Safety Instructions Warranty Information About this itemWritten by Crutchfield's Kramer CraneClassic Klipsch bookshelf sound Klipsch Reference Premiere speakers have earned rave reviews from Crutchfield customers for years. The RP-600M is the largest bookshelf speaker in the new Reference Premiere lineup, and continues the company's pedigree of ultra-efficient, high-performance sound. These attractive bookshelf speakers feature a 6-1/2" spun-copper woofer for punchy bass and powerful midrange, and Klipsch's signature 1" horn-loaded tweeter for smooth, detailed highs. Each Reference Premiere RP-600M bookshelf speaker features a horn-loaded tweeter for ultra-smooth highs. Hybrid horn technology for dynamic performance Horn technology is one of Klipsch's long-standing hallmarks. Flared openings in the speaker cabinet project sound waves toward your listening area and prevent them from simply spilling out in all directions. This design reduces reflections that can color the sound, and boosts dynamics and efficiency for powerful, "front row" sound that remains crystal-clear at all volume levels. Klipsch's Tractrix® horn features a circular throat around an advanced titanium diaphragm tweeter that transitions into a square 90º x 90º mouth. This unique shape provides a cleaner, more efficient transition of sound waves into your listening space. The result is a wide listening "sweet spot" with precise placement of instruments and vocals. A horn that enhances bass, too Take a look at the back of these speakers and you'll find that instead of the conventional round port tube found on many speakers, Klipsch uses a Tractrix horn-shaped opening for smoother, more efficient airflow in and out of the cabinet. The resulting decrease in air turbulence makes for cleaner, more powerful bass with reduced port noise and low-frequency distortion. Because these speakers are rear-ported, I recommend pulling them away from your wall or the back of the bookshelf to give them room to "breathe." Bi-amp or bi-wire for even better sound On the back of each speaker you'll find two sets of speaker input terminals. These let you bi-amp or bi-wire your RP-600Ms to get the best sound out of them.