Product Comparison: Klipsch RB-51 II vs Klipsch RB-61 II

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General Specifications
RB-51 II
RB-61 II
About the Product
The RB-51 II speaker offers up no-compromise music and movie performances in a smaller, more affordable bookshelf design. In fact, with its dynamic quality, superior sound and visual appeal, you’ll find this speaker simply irresistible.
The RB-61 II captures all the thrills and intensity of our floorstanding speakers in an appealing bookshelf design. In fact, this dynamic, compact speaker delivers a sound so powerful and detailed that it does the no-compromise Reference Series proud.
Key Specs
Power RMS
75 watts
100 watts
92 dB
95 dB
8 ohms
8 ohms
Size & Weight
11.4 in.
15.4 in.
6.5 in.
8.5 in.
10.7 in.
12.3 in.
20.9 lbs.
35.2 lbs.
What customers say about "Size & Weight"
Klipsch RB-51 II 2-Way Bookshelf Speakers, Black
  • These are perfectly sized with good sized woofer. These are real deal speakers for the price.
  • Great sound. Size fits easily in my entertainment center. Great small profile option.
  • Excellent sound. And a very compact size. Weight exceeded expectations, it is not a heavy and no light speaker.
  • It is very easy to hang on the wall because it is very light.
  • Most of all I was disappointed with its size, which turned out to be large in depth.
Klipsch RB-61 II Reference Series Bookshelf Loudspeakers, Black (Pair)
  • This is a relatively small speaker and for the size it is absolutely one of the nicest sounding speakers I have ever heard.
  • Our room is medium sized. It fits the room perfectly. Not too loud, but it has no issues filling the air with sound.
  • The sound is incredible for a speaker this size. Really nice speaker.
  • If you're looking for high sound quality bookshelf sized speakers, you won't be disappointed with these.
  • They are very attractive and very substantial in size and weight.
Peak Power
300 watts
400 watts
Min. Frequency Response
50 Hz
45 Hz
Max. Frequency Response
24 kHz
24 kHz
Tweeter Size
1 in.
1 in.
Woofer Size
5.25 in.
6.5 in.
What customers say about "Audio"
Klipsch RB-51 II 2-Way Bookshelf Speakers, Black
  • They may not be large, however they will fill a medium size room with clear crisp mids and highs and adequate bass.
  • These speakers reproduce sound across their range with precision and, as I said, a very clean sound.
  • They have a great mid and bass response to the lower limit of their frequency response but if you want thumping, pounding bass you'll still need to augment them with something.
  • Sound quality is amazingly good and well beyond what I had expected with these speakers.
  • The sound is very balanced: lows, mids, highs sound similar in volume.
Klipsch RB-61 II Reference Series Bookshelf Loudspeakers, Black (Pair)
  • The sound is so full and warm. They get great bass as well.
  • Sound is clear as a bell and so smooth. They are a high quality speaker for the price you pay.
  • Perfect set up for movies, games, tv, sports, or all of the above. I would recommend this brand to anyone looking for a great value surround sound.
  • The sound is very well balanced. Previously I had the Klipsch RM-15 which are detailed but they are smaller so the sound is more restricted.
  • They are well defined and clear, and the bass has plenty of presence but not as deep as my old speakers. In my opinion, nothing but clear powerful sound.
Tweeter Material
Woofer Material
Cerametallic Cone
Cerametallic Cone
Keyhole bracket, Dual threaded inserts, Wood-grain vinyl cabinet, Exclusive Tractrix® Horn technology, Bass Reflex, Rear-firing port
Bass Reflex, Front-firing port, Dual binding posts for bi-wire/bi-amp, Exclusive Tractrix® Horn technology, Wood-grain vinyl cabinet
What customers say about "Features"
Klipsch RB-51 II 2-Way Bookshelf Speakers, Black
  • Well built, almost heavy. Good easy connectors for wiring on the rear.
  • Love the magnetic attaching speaker grill. Looks great with or without the grill.
  • The magnetic grills are awesome and easily remove to show off the beautiful copper woofers.
  • Nice clean detail highs. Well build. Easy to hang on the wall.
  • All in all the Klipsch RB-51 II bookshelf speakers set the build and sound quality very high.
Klipsch RB-61 II Reference Series Bookshelf Loudspeakers, Black (Pair)
  • They have a bigger woofer and a better sweater as it's Titanium rather than Aluminum.
  • The cabinet is beautiful and very well built. These have the ability to bi-amp if you want to maximize their performance.
  • They are big, solid and well built. Magnetic speaker grills; it's simply, clean, and easy to remove.
  • The speakers are very detailed with very nice neutral bass. The sound is very well balanced.
  • Great sound and nice looking cabinet. Very happy with the sound and quality.
Warranty / Certifications
Manufacturer Warranty
1 year(s)
1 year(s)
Other Information

Other reviews