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Klipsch Reference RB-51 II

Bookshelf speakers

43 Reviews | 1 question - 8 answers

Item # 714RB51IIB

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Our take on the Klipsch Reference RB-51 II

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.

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.

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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

Upgraded from the Synergy's to these and they are excellent. They sound fantastic after you put some hours on them and they look just as good. I got a scratch and dent pair and there're totally worth it if you can find them.

Ryan G., Florida

What's in the Box:

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

Klipsch Reference RB-51 II Reviews

Average Customer Review(s):

(43 Reviews)

Klipsch RB-51 ii

Ryan G. from Florida on 8/26/2015

Crutchfield Customer Review (What's this?)

Upgraded from the Synergy's to these and they are excellent. They sound fantastic after you put some hours on them and they look just as good. I got a scratch and dent pair and there're totally worth it if you can find them.

Pros: Sound, looks

Cons: None

Great Little Bookshelf Speakers

mbooty from Massachusetts on 8/18/2015

Crutchfield Customer Review (What's this?)

I needed a small set of bookshelf speakers to do some vinyl listening in a rather small bedroom. These fit the bill perfectly. These were a great value and sound magnificent.

Pros: price, sound

Cons: none

Good crisp sound

Marty C. from Michigan on 8/6/2015

Crutchfield Customer Review (What's this?)

I'm slowly up grading my surround TV system, these speakers are in the front for now. I plan to move them to the rear when I can get a great price on the 6 1/2" speakers.

Pros: Great speakers. They beat the hell out my old Bose.

Cons: There isn't any

Book Shelf Speakers

Bill from North Carolina on 8/2/2015

Crutchfield Customer Review (What's this?)

Great sound from small book shelf speakers in a room about 13'-18'. Well worth the price.

Pros: Small size allows placement where space is limited, richness and depth of sound when used with a center speaker.

Cons: None

Amazing Bookshelf Speakers

Anonymous from Wisconsin on 7/29/2015

Crutchfield Customer Review (What's this?)

Amazing set of bookshelf speakers for any setup. I first heard these speakers at my girlfriend's parents house while watching The Shining for the first time. I could say that they gave me goose bumps, but that would be an understatement. I now have these set up with a N-22 from AudioEngine and they play just as great. The quality of sound that these speakers produce is well worth the investment. They play very crisp highs and a nice, mellow midrange.

Pros: Everything about this speaker. The highs, the midrange, the appearance, etc.

Cons: Nothing at all

Great upgrade to to home theater in a box speakers

Riley from Iowa on 7/19/2015

Crutchfield Customer Review (What's this?)

Finally got around to upgrading some low-end Onkyo speakers that came with an old home theater bundle and these were well worth the purchase. Sound is excellent and incredibly clear even at very high volumes. The only problem with them is that they have made me realize I need to upgrade my other speakers to match them very soon.



Thank you satisfied customers

Home from Massachusetts on 7/7/2015

Crutchfield Customer Review (What's this?)

I received my speakers today for surrounds in a 5-1 speaker setup. For consistency I now have all Klipsch speakers. I find no faults with the sound of any of my speakers as they present a very long term investment for me. My room that they are in is small so though I could expand my system to a 7-1 with2 sub woofers that is impossible in my situation, The Klipsch rb61-2 are my main speakers and and a center channel is Klipsch,so bass production is no problem. When a set up is right sound is natural,so thinking about how something sounds ceases,that is when you know the system is right. That is my measure for any sound system.

Pros: These Chinese made speakers I bought are great value for a home theater system. The Klipsch heritage American made line is best for conventional stereo as they are the best speakers on the market,they are open and natural,as the Heresy,is my reference standard,to judge any competitive speaker. Thanks to Crutchfield customers with the positive reviews on these speakers I chose,your opinion as of great value to me. They are truly great.

Cons: If Chinese made bothers you, most formerly made great American lines of great speakers are Chinese produced. Klipsch still knows how to produce a great speaker no matter where they are made and that is true of Bose,Tivoli and other manufacturers.

Great bookshelf speakers

J.B. from Kennett square, PA on 7/7/2015

Crutchfield Customer Review (What's this?)

Great set of small(er) speakers than what I was using. I got these on sale to replace a larger set of infinity studio monitors and I have been very satisfied with my purchase. They are significantly smaller and while they don't have the bass response that the infinity's did they suit my music (and TV) listening needs. I listen to a lot of classic rock so I wanted something to help with that replication of frequencies and these fit the bill.

Pros: Small, loud, good bass response

Cons: Not great on the low end

Nice upgrade

Ed K from Illinois on 7/5/2015

Crutchfield Customer Review (What's this?)

These speakers are great I replace my old Bose cubes and the difference is instantly noticeable, with a lower midrange and crisper highs.

Pros: An all around great speaker at a great price

Cons: Non as of yet

Amazing sound

Rob from South Carolina on 7/1/2015

Crutchfield Customer Review (What's this?)

As advertised. Great sound. Great support too.

Pros: Can't do better for the price. Look and sound great.

Cons: None


Den from Pennsylvania on 6/21/2015

Crutchfield Customer Review (What's this?)

I used these speakers as my surround and rear speakers and they're awesome perfect with my center reference speaker and reference floor standing speakers

Pros: perfect

Cons: none

Great Speaker

Dave B from New Mexico on 6/7/2015

Crutchfield Customer Review (What's this?)

It does everything I expected of a speaker this size!

Pros: Great mid range and high end. Does a really nice job for a bookshelf speaker. Great value for money!

Cons: A little lacking on the bass than I was expecting.

Small size, great sound!

Bob from Texas on 6/7/2015

Crutchfield Customer Review (What's this?)

Bought these to replace my pioneer BS-22-LRs. Also had a sub attached as well. The Klipschs sound really bright. The highs sound crystal clear. The bass sounds so good that I got rid of the sub. Using an Onyko 8020 reciever and an Onkyo 7030 CD player. Would definitely recommend.

Pros: Price, size, sound

Cons: Makes me want to upgrade to an integrated amp!

RB-51 II speakers

Lin H from Louisville, Kentucky on 5/20/2015

Crutchfield Customer Review (What's this?)

Excellent sounding speakers. Just what I was looking for! Sound is clear and crisp...nice low, mid and upper range. Plenty of sound, and then some, for 15x30 room. Using as fronts in surround system, along with center channel speaker of same make/model. When used for stereo music listening...awesome! Variety of music sounds fantastic...Fourplay, Jill Scott, Classical...still breaking them in, running through my CD collection. Couldn't beat the sale price and customer service, as always, was excellent with Crutchfield!!!

Pros: Clean, clear, crisp, warm sound. Great for music listening. Nice size and plenty of soundscape.

Cons: none

Klipsch RB-51 II

Dogdad from Ohio on 5/19/2015

Crutchfield Customer Review (What's this?)

Clear,crisp sound. Replaced my worn out front 5.1 system speakers. Pairs well with remaining speakers and Yamaha receiver.

Pros: Price, quality

Cons: Larger/heavier than I had hoped for

best speakers!

richie from chicago on 5/16/2015

Crutchfield Customer Review (What's this?)

Best klipch speaker to Start out building a surround system.

Pros: Nice size and great sound.

Cons: You will need to pair with a subwoofer to get more base in your sound.

Awesome surround speakers

Jwall121988 from Michigan on 5/4/2015

Crutchfield Customer Review (What's this?)

Just got these to use as my surround speakers in a 5.1 set up. I have them running with all Klipsch speakers. I must say that these guys aren't being used that often simply because the surround effects only come every so often while watching shows/blu-ray movies, but when they do come, they sound so good its unbelievable. They make my old surround speakers sound like pure garbage. I can actually HEAR what is meant to be heard finally to my left and right. Its really quite awesome. I love how they look, they feel incredibly solid, and Im really happy I bought these bad boys.

Pros: Awesome clear sound Amazing design Build quality is top notch

Cons: none

clear,crisp, sound

Donaldo from Michigan on 4/30/2015

Crutchfield Customer Review (What's this?)

paired with powerful onkyo amp and denon turntable. everything from classical to rock sounds great on my old vinyl records.crisp treble and nice bass without distortion.

Pros: nice crisp sound, like guick,easy wire terminals

Cons: none

Small Package - Robust Sound

Beatinski from New York on 4/27/2015

Crutchfield Customer Review (What's this?)

I have a set of older US made Klipsch towers, which of course, sound better. That said, these fit the bill surprisingly well where I needed a set of smallish speakers. At low volume they actually sound more full than their larger counterparts, yet they can adequately fill a room surprisingly well. You don't feel the bass with these, however, and for better or worse, your room doesn't vibrate. On the other hand, they are excellent for giving you decent range at lower volume while not bothering neighbors. These speakers perform well and will require decent input sources.

Pros: Surprisingly full and robust for their size. Excellent low volume range. Solid heavy cabinet. Strong midrange.

Cons: Made in China. Is this really necessary?

Klipsch Reference RB-51 II

mike m from Summerfield, NC on 4/27/2015

Crutchfield Customer Review (What's this?)

I own pair of original cornwall speakers and have several other klipsch products.this product is outstanding.



Outstanding speaker

JTBell from Arkansas on 4/22/2015

Crutchfield Customer Review (What's this?)

These speakers are the centerpiece of my new music-only room, along with my venerable Klipsch KSW-10 sub. I have owned Klipsch products for over 30 years, and these speakers fully live up to the legacy and sonic expectations one has when purchasing a Klipsch product. With the recent price drop due to the new line of Klipsch Reference speakers, the RB-51's present an incredible value as well. If you are in the market for a superb bookshelf speaker, the RB-51 is definitely a very strong contender, and if you're on a budget, I am not aware of any speaker that provides as much quality sound for the money.

Pros: Great Dynamics, Realistic Sound Reproduction, Clear

Cons: None.

RB-51 II

Anonymous from Puerto Rico on 4/12/2015

Crutchfield Customer Review (What's this?)

Exelente bocina para un cine en casa pero para escuchar musica en estéreo creo que hay mejores por el precio. Es una bocina elegante si la quieres lucir. Excellent speaker for a home theater, but I think that for the money there are better speakers for listening to music in stereo. It's an elegant speaker if you want to show it off.



Crutchfield response on 4/14/2015 Translation provided by Crutchfield's International Sales & Support team.

5 Star

Anonymous from Puerto Rico on 4/6/2015

Crutchfield Customer Review (What's this?)

Perfect size. Great product. Excellent Service. Fast Shipping.



New toys

John H. from Connecticut on 3/26/2015

Crutchfield Customer Review (What's this?)

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

Terriann from Long island NY on 3/25/2015

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.

CathyA from Washington on 3/24/2015

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

Robert from New York on 3/23/2015

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

Walt P. from Virginia on 3/23/2015

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

Harry R from Pensacola, FL on 3/20/2015

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"

JerryR from Georgia on 3/14/2015

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!

Squishman from Eagan, Minnesota on 3/14/2015

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

StanC from Barkhamsted CT on 3/9/2015

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!

Dave from United States on 3/3/2015

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

Brian from New Jersey on 3/1/2015

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

htatlau from Singapore on 1/29/2015

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

Kyro from Washington on 1/15/2015

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!

Dan D from Pennsylvania on 12/11/2014

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

Tim from NY on 10/4/2014

Crutchfield Customer Review (What's this?)

perfect sound with clean modern look.



Klipsch RB-51 II

Eduardo from Chicago, IL on 10/3/2014

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

BrianW. from West Liberty, Ky on 3/20/2014

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.


Nick from Beaumont, CA on 1/13/2014

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

JimC from Charlottesville, VA on 10/31/2012

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.


Todd from TN on 3/18/2012

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.


Hands-on research

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.

Q & A

Customer Q&A

1 question already asked

Sorry I don't feel qualified to answer because for us these speakers are part of a 4 speaker system so we can not really isolate just these. What I can say is that these speakers along with a matching center speaker and wireless subwoofer all powered by an Onkyo amplifier produce GREAT sound with no shortage of bass. [ HERBERT  Mar 03, 2015 ]
I use these speakers as fronts in a 7.1 setup. They are satisfactory for mid bass, but suggest a powered sub to compliment them. [ BRIAN  Feb 23, 2015 ]
I have my crossover set to 100hz. I cannot speak specifically to that frequency, but I noticed some clipping at mid to mid hi volume when watching the movie "Gravity". That movie in my opinion really tests the low range of a system because there are a ton of low end thumps and bumps to simulate being in space. I noticed less clipping without a loss in fidelity at that setting. Granted you have a subwoofer. [ Nick  Feb 23, 2015 ]
I am probably not the right person to ask I am using them as part of a 5.1 surround system in my game room. For that they work great! [ MARK  Feb 23, 2015 ]
Annie ...they are absolutely amazing for their size. I would have preferred the RB61 instead but my shelf setup in my office is made of square spaces IKIA fixtures and this was the max hight it would take . It takes a while to get the best sound ( about 100 hrs ) . I recently felt I was missing a bit in the lows ( some purists might argue this point ) but I deciced to setup a 2.1 using a small sub made by klipsch other brand ENERGY , because it's the only one that was front firing and would fit it the office shelf wall . I put the sub in lower left under my desk . The 2 RB 51 are at ear level when sitting in my couch . I am getting a much fuller sound and just love the setup . My Amp is an NAD 3020D that is absolutely amazing. Hope this helps .... Sorry for the long answer :) [ SERGE  Feb 22, 2015 ]
Yes. Response in the low end is quite good.. [ JAMES  Feb 22, 2015 ]
It seems like it to me, but I have the RC-62 II center speaker that might be doing the heavier lifting on the low end. Hard to tell. What I like most about Klipsch speakers (besides the value/performance ratio) is that they are efficient and easy for receivers to drive. That lets you go louder and/or save money and not buy a higher end unit with extra watts. [ NATHANIEL  Feb 22, 2015 ]
honestly, I would say no. I used my pair in conjunction with a sub and as a temporary fix. I upgraded them to the RF 62 II speakers. I have a large room and these RB 51, while great sounding and great quality, just couldnt fill the room as i would like. You have to think, it's a book shelf speaker. They are not going to pound out thundering bass and a have huge room filling sound stage for your home theater. That being said, if you are just wanting high quality speakers for an office, bedroom or other smallish room, they will sound very good and do a respectable job, and better than most book shelf type speakers. A 51/4 inch woofer just doesnt move enough air to faithfully reproduce the low end. [ SEAN B  Feb 22, 2015 ]