
Klipsch R-51M Bookshelf Speakers Pair
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The Klipsch R-51M is a passive two-way bookshelf speaker sold as a pair, built around a 1-inch aluminum Tractrix horn tweeter and a 5.25-inch spun-copper IMG woofer. Its high sensitivity means modest amps and AV receivers drive it to loud levels easily, and the horn tweeter gives it the lively, forward Klipsch sound. It suits stereo and home theater setups where the speakers sit on a shelf, stand or desk. Against rivals like the ELAC Debut 2.0 B5.2 or Q Acoustics 3020i, it is more efficient and more forward in the treble, but less neutral and less forgiving of bright recordings.
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Owners and reviewers generally rate the R-51M highly for its energy, detail and value, calling it a lively speaker that punches above its class. Most criticism centers on the bright, sometimes aggressive treble and the placement demands of the rear port.
The Klipsch R-51M is a pair of 2-way bookshelf speakers. They can be used for stereo listening or in a home theater as front, rear or surround speakers.
Each speaker has a 1" aluminum LTS (Linear Travel Suspension) tweeter paired with a 90° x 90° Tractrix horn. The 5-1/4" copper-spun injection molded graphite (IMG) woofer is light and rigid, which keeps cone breakup and distortion low. The woofer is magnetically shielded.
The cabinet is bass-reflex, with a rear-firing port that is flared to minimize turbulence. It has a wood grain vinyl finish and removable grilles. The 5-way binding posts accept banana plugs (single or dual), pin connectors, spade lugs and bare wire up to 10AWG. Two plastic caps must be removed to use banana plugs.