Klipsch Reference RB-51 II

Bookshelf speakers

Item #: 714RB51IIB

In Stock

20 Reviews


Special Purchase:-$170.00

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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.

Grille off

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.

Cabinet construction

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.

Check out the rest of our Klipsch lineup, and build a complete Reference Series II home theater or stereo speaker system. And don't forget to add a Klipsch subwoofer for high-impact bass.

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Shop our selection of speaker wire.

Product Highlights:

  • 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

Why choose bookshelf speakers?

Bookshelf speakers may be small in size, but they can deliver surprisingly big sound. Some ultra-compact models even fit on a desktop. Most are right at home in tight spaces like shelves, so they're usually good choices for your home theater's rear channels. For the best performance, try placing bookshelf speakers on solid speaker stands to help the sound really "open up." If you want full bass impact, add a powered subwoofer and enjoy punchy sound that's as deeply satisfying as that of floor-standing speakers.

Hands-on research

What's in the box?

Download owner's manual

  • 2 Black two-way bookshelf loudspeakers
  • 2 Detachable magnetic grilles (attached)
  • 8 Self-adhesive rubber feet
  • Owner's Manual

Features and Specs

Enclosure Bass Reflex
Video Shielded No
Tweeter Type Tractrix Horn
Tweeter Size (inches) 1
Midrange Size (inches) ---
Woofer Size (inches) 5.25
Woofer Composition Cerametallic
Woofer Surround Rubber
Power Range 75
Sensitivity 92 dB
Impedance (Ohms) 8
Frequency Response 50-24k Hz
Connector Type Binding post
Bi-amp Inputs No
Height (inches) 11-3/8
Width (inches) 6-1/2
Depth (inches) 10-15/16
Weight (pounds) 10.45
Mounting Bracket Included Keyhole
Recommended Stand Height (inches) 28-31
Parts Warranty 5 Years
Labor Warranty 5 Years

Product Research

Driver Technology
Enclosure Design
Mounting Options

Driver Technology

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.

Enclosure Design

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.

Mounting Options

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.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Klipsch Reference RB-51 II Reviews

Average Customer Review:

20 reviews
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New toys

Written By John H., Connecticut on Thursday, March 26, 2015

I bought these to compliment my 30 year old Klipsch floor standing speakers. I wanted a little more highs in the room and they seem to fit the bill perfectly. I just spent some money having my Dual 1229 turntable refurbished and let me tell you, going back to listen to vinyl again is such a treat. I had forgotten how nice it sounds.

Pros: Wonderful speakers at a great price.

Cons: none.

Great speakers

Written By Terriann, Long island NY on Wednesday, March 25, 2015

Crutchfield Customer Review (What's this?)

Great speakers small but powerful sound. More importantly is Crutchfield they are the best. Couldnt get these speakers anywhere else. Great return policy. Will shop here again.

Pros: Good shipping, great sound, small size

Cons: None!

Lovely, clear sound.

Written By CathyA, Washington on Tuesday, March 24, 2015

Crutchfield Customer Review (What's this?)

I'm extremely happy with these speakers. They have a lovely, clear sound and a great range from lows to highs.

Klipsch Reference RB-51 II

Written By Robert, New York on Monday, March 23, 2015

Crutchfield Customer Review (What's this?)

I was looking for set of speakers for long time. Went through Infinity P163BK, procinema 600, Klipsch KB-15, Bose and then finally RB51-II and these speakers are GREAT. So clear, clean, crisp and reach sound. Worth every penny. Excellent.

Great Speakers

Written By Walt P., Virginia on Monday, March 23, 2015

Crutchfield Customer Review (What's this?)

Pleasantly surprised by the quality of construction and quality of soundl. Good crisp highs with pronounced midrange blends well with excellent an soundstage. I use mine with a Definitive Tech SC1 Subwoofer to reinforce the bottom end. Overall I am very impressed with the RB-51's and Crutchfield's service and 60 day return policy is unbeatable in the industry.

Pros: Good construction with lively sound and forward soundstage.

Cons: Noine yet.

Klipsch Reference RB-51 II

Written By Harry R, Pensacola, FL on Friday, March 20, 2015

Crutchfield Customer Review (What's this?)

The Klipsch RB -51 II bookshelf speakers are providing sound quality far beyond my fondest expectations. Replacing larger bookshelf speakers, the Klipsch speakers provide distinct and accurate sound for any type of music including symphony orchestra, voice(s),small ensembles, and individual solos. I was pleasantly surprised with the quality and fullness of bass, not that of loud and boosted bass. These speakers provide lushes. full and accurate sound. Thank you Klipsch.

Pros: Full, accurate sound.

Cons: None noted.

Speakers for the "musical purist"

Written By JerryR, Georgia on Saturday, March 14, 2015

Crutchfield Customer Review (What's this?)

I enjoy music very clear! If I want additional "effects", I'll use my receiver's equalizer & effects processors. Klipsch speakers provide the utmost in clarity. Even if you enjoy your music "tweaked", you have to start with an accurate sound. Admittedly, the RB-51 does not accentuate a booming base (which I do not usually want) but that is the sub-woofer's job. I've been a musician/composer for 40+ years & like to be able to hear every note, no matter how complex the music.

These speakers also do a great job in film mode - fantastic music & crisp dialog. Very versatile. Coupled with Crutchfield's unparalleled customer service, they're a home run!

Pros: Clarity. Accurate music reproduction. Klipsch speakers ... biggest bang for the buck that I know of.

Cons: None

Great upgrade!

Written By Squishman, Eagan, Minnesota on Saturday, March 14, 2015

Crutchfield Customer Review (What's this?)

I had been using some suped up Minimus 7's for my front speakers. Now that I have my Klipsch Speakers, I have moved them to the rear for surrounds. I am hearing more depth, fullness and staging and just great clarity than ever before. Very happy with this purchase!

Klipsch Reference RB-51 11

Written By StanC, Barkhamsted CT on Monday, March 09, 2015

Crutchfield Customer Review (What's this?)

How can you go wrong with Klipsch speakers, they are great. But what was even more awesome was the customer service from Crutchfield!! When I received the speakers and took off the front cover, to my disappointment one of the speakers was torn right off the box and laying on the bottom of the speaker box. I called Crutchfield and told her my problem. She immediately e-mailed a pre paid return postage slip AND sent me out brand new speakers that day with out first checking out my returned damage speakers. I have bought numerous other equipment from Crutchfield and this was my first time having a problem. This experience confirms what many other customers have stated concerning Crutchfield great customer service and I will NEVER buy from anywhere else!

Pros: Great speakers and even greater customer service.

Cons: None

So far so good!

Written By Dave, United States on Tuesday, March 03, 2015

Crutchfield Customer Review (What's this?)

Currently using them in a 2.0 (stereo) setup attached to a pioneer vsx-824 receiver. Only have had the setup for a few days but out of the box they are very clear. I haven't purchased a sub woofer yet so I am currently running full range through them and they do reproduce fairly low frequencies. Obviously the low frequencies are going to be reproduced much lower (spl) than the mid/high frequencies, so add a sub woofer if you like a lot of bass that you can "feel" in your music, but if you want to just "hear" it they do the job pretty well so far!

RB-51 II

Written By Brian, New Jersey on Sunday, March 01, 2015

Crutchfield Customer Review (What's this?)

Excellent speakers at a very good price. A step up from my Primus infinities,

Pros: Very efficient and great detail

Cons: None

Good product

Written By htatlau, Singapore on Thursday, January 29, 2015

Crutchfield Customer Review (What's this?)

Great highs and mids. Bass is surprisingly good for a speaker of this size.

Will review more once I break it in.

Pros: Great value for money

Cons: None yet

Amazing sound for the price

Written By Kyro, Washington on Thursday, January 15, 2015

Crutchfield Customer Review (What's this?)

I've been an audiophile for quite a while some high quality headphones and car speaker systems so I finally decided to buy some house speakers. My final decision was between these, some definitive speakers and some polk audio and after 5 days of searching review after review I ended up with these and couldn't be happier. These sound orgasmic and make my music ten times more enjoyable to listen to! I mainly use these for listening to music and they sound amazing in every category from classical to dubstep to rap. When I do hook them up to the tv they bring such lifelike sounds that it raises the whole experience. I bought a cheap 10 inch powered woofer with these and it makes for a great system. In the end I bought it here from Crutchfield because it has a built in warranty and the service support. Originally I would've gone with amazon but for a warranty its like an extra hundred so these guys won and are much better customer support. Thank you Crutchfield!

Pros: Sound amazing whatever kind of music I play pretty strong bass for their size can get extremely loud, I've never been able to max them out because my ears would most likely start bleeding Extremely stylish and cool looking

Cons: NONE

Music to my Ears!

Written By Dan D, Pennsylvania on Thursday, December 11, 2014

Crutchfield Customer Review (What's this?)

They are the right size, they make beautiful music, they are good looking, they are easy to set-up, and most importantly they are an excellent value, a huge bang for the buck

Cons: Should have bought them years ago!

Klipsch ref rb-51

Written By Tim, NY on Saturday, October 04, 2014

Crutchfield Customer Review (What's this?)

perfect sound with clean modern look.

Klipsch RB-51 II

Written By Eduardo, Chicago, IL on Friday, October 03, 2014

Crutchfield Customer Review (What's this?)

It was time for an upgrade for speakers, 20 years was a long time. I was so impress with the quality of craftsmanship of the speaker. I was blown away of the clarity and bass these bookshelf speakers have. For the size of the driver these put our great volume level. Action movies are more enjoyable now with these speakers.

Pros: Very clean response and tight bass, sound amazing.

Cons: Non.

Klipsch Reference RB-51 II

Written By BrianW., West Liberty, Ky on Thursday, March 20, 2014

Crutchfield Customer Review (What's this?)

I am using these as my front speakers in my 7.2 setup in my living room. I purchase a new entertainment center that did not allow enough room for my klipsch floor standing speakers. I debated much larger bookshelf speakers, but for a living room these have plenty of sound for movies and music. If you were using them as stand alone you may want to go larger, but when accompanied by my 12" sub and surround, they are more than sufficient .

Pros: Good sound in a small package.

Cons: none.


Written By Nick, Beaumont, CA on Monday, January 13, 2014

Crutchfield Customer Review (What's this?)

I got these to not too long ago and I am very pleased with their performance. They are being driven by a SONY STR - DN840 and they are awesome. Music, movies, whatever... the sound is fantastic. Although these don't have huge drivers, they do have quite decent bass response when used without a subwoofer. I would totally buy these again.

Pros: Solid construction, excellent sound at all volume levels, decent bass response.

Cons: None

Klipsh RB-51 review

Written By JimC, Charlottesville, VA on Wednesday, October 31, 2012

I just purchased and wall mounted these speakers in my home. I listened to a number of speakers in the store they have set up in the "speaker room." These were the best to my ear. They are crisp at the high end and do a very thorough job throughout the low and mid-range.

Pros: Quality made, attractive, and priced right.

Cons: None.


Written By Todd, TN on Sunday, March 18, 2012

Crutchfield Customer Review (What's this?)

These are ok speakers. Not very musical but good for movies in a home theatre setup. I had these with the matching center RC52II and returned them all. They just did not do it for me. The surrounds are awesome though. I did keep the RS42II but decided to go with a different brand fronts and center. The customer service is absolutely fantastic with Crutchfield. The receiver I bought (Yamaha Aventage 1010) with these did not turn on so they sent me a new one. That one has a loose HDMI port, guess what... they are sending me a new one no questions asked. It is not Crutchfield's fault the product has a defect. The 60 day return policy is industry leading.

Pros: Good for movies. Very handsome looking speaker. They just don't sound very good. Crutchfield customer service is top notch so when you do make your decision on speakers etc... Crutchfield will take care of you. No they did not pay me to write this review, I just know how it is to get bad service. Do not worry about that with Crutchfield.

Cons: The titanium tweeters are not as musical as the aluminum tweeters. Voices sound muffled even after much PEQ manipulation. I really tried to like the Reference II series speakers but B&W just sound so much better. I wish they (B&W) allowed Crutchfield to be a mail order seller, but it is not their (B&W) business model to allow mail order sales.

Get everything you’ll need to enjoy your new Klipsch Reference RB-51 II

You'll need speaker wire to connect your speakers to your amp or receiver. No wire is included with this speaker.
Add connectors to your bulk speaker wire for a neater, easier, and more reliable installation.
Cut your speaker wire to the exact length you need.
Get your speakers off the floor and at ear level where they are meant to be.
Mount your speakers safely on the wall.
Original Monster Cable

Original Monster Cable

With gold pin connectors (15-foot pair)

Item #: 119OMC1515


Add to Cart
Monster Cable SuperFlat™ Mini

Monster Cable SuperFlat™ Mini

Decor-friendly speaker cable with gold pin connectors (50-foot spool)

Item #: 119SFLM50


Add to Cart
AudioQuest Type 4

AudioQuest Type 4

Speaker cables with pre-attached banana connectors (10-foot pair)

Item #: 703T410BFS


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Monster Twist-on Banana Connectors

Monster Twist-on Banana Connectors

2 pair, 12-gauge

Item #: 119MTTRH2


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Monster Cable Twist-on Angled Gold Pins

Monster Cable Twist-on Angled Gold Pins

4 pair, 12-gauge

Item #: 119AGPTRH2


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AudioQuest X2 Speaker Cable

AudioQuest X2 Speaker Cable

14-gauge cable, connectors optional (30 feet, Gray)

Item #: 703X230G


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AudioQuest G2 Speaker Cable

AudioQuest G2 Speaker Cable

16-gauge cable, connectors optional (30 feet, Gray)

Item #: 703G230G


Add to Cart
Monster XPHP™ MKII

Monster XPHP™ MKII

Speaker cable with clear jacket (100 feet)

Item #: 119XPHP100


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Monster XP®

Monster XP®

Speaker cable with clear jacket, connectors optional (100 feet)

Item #: 119XPMS1H


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Monster XP® Navajo White MkII

Monster XP® Navajo White MkII

Speaker cable (50 feet)

Item #: 119XPNWS50


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Sanus BF31B Speaker Stands

Sanus BF31B Speaker Stands

Basic Foundations® — 31"

Item #: 051BF31B


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Sanus NF30 Speaker Stands

Sanus NF30 Speaker Stands

Natural Foundations Series IV — 30" (Black lacquer)

Item #: 051NF30B


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Bell'O SP-224

Bell'O SP-224

24" speaker stands

Item #: 494SP224


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Bell'O SP-300

Bell'O SP-300

30" speaker stands

Item #: 494SP300


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Pinpoint AM-41

Pinpoint AM-41

Side-clamping speaker wall mounts

Item #: 121AM41B


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IsoAcoustics ISO-L8R155 Monitor Stands

IsoAcoustics ISO-L8R155 Monitor Stands

Supports medium speakers

Item #: 892L8R155


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Looking for more? Check out the next model in this lineup.

Klipsch RB-61II BK (pair)

Klipsch Reference RB-61 II


In Stock

$349.99 After $200.00 Special Purchase

Add to Cart

Experience even more thrilling, intense sound

The Klipsch Reference RB-61 II offers these features:

has a 6-1/2" woofer for bass down to 45 Hz

handles up to 100 watts (400 watts peak)

has a front-firing port for placement in a bookcase or against a wall

has dual inputs for optional bi-amping or bi-wiring

available in black ash or cherry vinyl finish

cannot be wall-mounted