About the Klipsch Reference RB-51 II
A smart balance of performance, size, and value
A smart balance of performance, size, and value
Klipsch® has a no-compromise attitude when it comes to speaker performance — which is why the conveniently sized, modestly priced RB-51 II bookshelf speaker can sound so good. They offer up dynamic, full-bodied sound that makes them ideal for medium-sized rooms. Building on Klipsch's previous Reference speaker line, the Series II models have updated drivers and a new crossover system for even more spacious sound. So they're equally impressive whether you're watching a movie or listening to music.
Horn technology for "front row" sound
All Reference Series II speakers feature a redesigned version of Klipsch's famous horn-loaded tweeter. Because high-frequency sounds are more directional than bass frequencies, it's especially important to target them right toward your ears. Klipsch places their titanium tweeter inside a flared opening, known as a "horn," which disperses the highs evenly across your listening area in a 90°-wide, 60°-high pattern. With their Series II speakers, Klipsch has redesigned the shape and slope of their famous horn enclosure, so your movie soundtracks and music will sound more "open," with improved dynamics and efficiency. All in all, you can count on powerful, "front row" sound that's crystal-clear at all volume levels.
High-tech driver design
The RB-51 IIs also use newly machined, light-yet-rigid Cerametallic woofers with a folded edge to produce smoother mids and tighter bass. The specially treated aluminum in the cones help to dampen unwanted vibrations and distortion, while an integrated dustcap gives them a cleaner look and adds stability. And the rigid, braced cabinets come in a handsome woodgrain vinyl finish.
- frequency response 50-24,000 Hz (±3dB)
- power handling: up to 75 watts RMS (300 watts peak)
- sensitivity 92 dB
- 8-ohm impedance
- Tractrix® horn with 1" titanium dome tweeter
- 5-1/4" Cerametallic woofer
- bass-reflex (ported) design
- black ash woodgrain vinyl finish
- keyhole slots for easy wall-mounting
- dual threaded inserts for optional wall-mount brackets
- 6-1/2"W x 11-3/8"H x 10-15/16"D
- warranty: 5 years
- Our 60-day money-back guarantee
- MFR # 1011854
What's in the box:
- 2 Black two-way bookshelf loudspeakers
- 2 Detachable magnetic grilles (attached)
- 8 Self-adhesive rubber feet
- Owner's Manual
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Features & specs
|Tweeter Type||Tractrix Horn|
|Tweeter Size (inches)||1|
|Midrange Size (inches)||---|
|Woofer Size (inches)||5.25|
|Frequency Response||50-24k Hz|
|Connector Type||Binding post|
|Recommended Stand Height (inches)||28-31|
|Parts Warranty||5 Years|
|Labor Warranty||5 Years|
Highly-Efficient Design: The Klipsch RB-51 II utilizes a highly efficient design to produce more output using less power & energy for louder sound with less distortion. The RB-51 II is able to fill smaller rooms with outstanding, accurate, non-fatiguing sound that you can listen to for hours.
Tractrix Horn Tweeter: Each Klipsch RB-51 II features a professional-grade 1.0-inch titanium-diaphragm compression driver inside a square Tractrix Horn for smoother high-end response with greater extension, enhanced imaging, and more powerful dynamics. The Tractrix Horns deliver a 90-degree wide by 60-degree high dispersion pattern for a broader sound-stage. Behind each horn lies a 1.0-inch titanium tweeter with a linear travel suspension for open, natural, sound.
Cerametallic Woofer: The 5.25-inch woofer of the RB-51 II features Klipsch's distinctive, copper-colored Cerametallic cones. Made with an anodized aluminum, these cones are strong and dent resistant. The anodizing process converts their inner and outer surfaces to ceramic. The outcome is a rigid cone with superb damping characteristics that will not flex or resonate at frequencies within the woofer's operating range. The 5.25-inch woofer also employs a rubber surround for added durability.
Crossover Network: For signal purity and perfect driver integration, the crossover on the RB-51 II features the finest components and Klipsch custom internal wiring.
Bass Reflex Enclosure: The dual 5.25-inch Cerametallic cone woofer and 1.0" titanium diaphragm compression driver are mounted in a bass reflex enclosure which features a single rear-firing port. The RB-51 II's rigid cabinet offers improved internal cross-bracing to minimize panel vibrations that can color sound and a rear-firing port to eliminate turbulence noise. A black metallic finished baffle around the horn mouth and woofer dramatically improve acoustics across the sonic range. The bass reflex enclosure features a MDF cabinet finished with a Black Ash wood-grain vinyl veneer.
Magnetic Grille: The bookshelf loudspeaker features a removable magnetic grille which easily snaps into place over its cast-aluminum front baffle. The speaker can be used with or without its grille in place.
Binding Posts: Each bookshelf loudspeaker is equipped with one pair of sturdy binding posts to ensure a secure connection to many types of speaker cables and connectors. The binding post terminals will accept banana plugs (single only), pin-connectors, spade-connectors, and bare wire.
Rubber Feet: Each bookshelf speaker comes supplied with eight self-adhesive rubber feet (4 for each speaker) so you can sit the speakers on a stand or shelf securely. The rubber feet add approximately 0.3125" to the height of each speaker. There are also two 1/4"-20 threaded inserts on the back of each loudspeaker for mounting the speaker to third-party stands (sold separately).
Note: The two threaded inserts are spaced 3.0" apart.
Wall Mounting: Each Klipsch Reference bookshelf speaker feature a single keyhole slot on the back of the cabinet for wall-mounting the speaker without any additional wall-mount bracket (mounting screws not supplied).
Placement: The Reference Series bookshelf loudspeakers are designed to perform well in a wide variety of locations but you will get the most out of the speakers by following these simple guidelines.
- Place the front left and right speakers on shelves or stands with their tweeters at approximately ear height for a seated listener. When used surround sound speakers, they normally perform best when placed slightly higher than ear level.
- The bookshelf loudspeakers should be equal distance from the floor and the wall behind them. It can also helps to have the left and right speakers at different distances from their nearest side walls. This sort of staggering helps smooth the bass range.
The Klipsch Reference RB-51 II replaces these items
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