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Klipsch RP-600M II Bookshelf Speaker vs Klipsch R-51M Bookshelf Speakers

The RP-600M II is the better speaker: a larger 6.5" Cerametallic woofer, a 1" titanium LTS tweeter in a bigger Tractrix horn, and deeper bass reach down to 44 Hz. The R-51M is the smaller, lighter, easier-to-drive option with dual 5.25" IMG woofers and a 5-year warranty, and owners rate it highly. Buy the RP-600M II if sound quality is the priority; buy the R-51M if you want a compact, forgiving pair for a desk or small room.

  • Choose the RP-600M II if you want the most dynamic, detailed sound and deeper bass from a bookshelf pair, and you have an amp with real power behind it.
  • Choose the R-51M if you need a compact, light pair that is easy to place and easy to drive, and you want a long warranty.

Prices

  • Klipsch RP-600M II Bookshelf Speaker: $399.99 at electronicsexpo.com (last seen Nov 8)
  • Klipsch R-51M Bookshelf Speakers: $289.99 at Amazon (last seen Nov 8)
  • Difference: the Klipsch R-51M Bookshelf Speakers is $110.00 cheaper than the Klipsch RP-600M II Bookshelf Speaker at the latest prices (Nov 8)
Klipsch
Klipsch Reference Premiere RP-600M II Bookshelf Speaker

Klipsch RP-600M II Bookshelf Speaker

Klipsch Reference Premiere RP-600M II Bookshelf Speaker

5(2 ratings)
$399.99at electronicsexpo.comObserved at 10:33 PM
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Visit electronicsexpo.com
Pros
  • Deeper bass and wider frequency range from the larger woofer
  • Titanium LTS tweeter in a bigger horn gives crisp, detailed highs
  • Bi-wiring and bi-amping terminals allow more setup flexibility
  • High 94 dB sensitivity plays loud with modest power
Cons
  • Bigger and heavier, so it needs more shelf or stand space
  • Horn-loaded treble can sound forward to some ears
  • Needs a capable amp to show what it can do
Klipsch
Klipsch R-51M Bookshelf Speakers

Klipsch R-51M Bookshelf Speakers

4.8(265 ratings)
$289.99at AmazonObserved Nov 8, 2026, 8:29 AM
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Pros
  • Compact and light, easy to fit on a desk or small shelf
  • Dual woofers give solid bass for the cabinet size
  • 5-year warranty and a strong owner rating
  • Easy to drive at 93 dB sensitivity
Cons
  • Bass rolls off at 62 Hz, so deep low end is limited
  • Aluminum tweeter is less refined than the RP-600M II's titanium unit
  • No bi-wiring or bi-amping terminals

What separates them

Klipsch RP-600M II Bookshelf SpeakerKlipsch R-51M Bookshelf Speakers
WooferSingle 6.5" spun-copper Cerametallic wooferDual 5.25" spun-copper IMG woofers
Tweeter1" titanium LTS vented tweeter1" aluminum LTS tweeter
HornLarger 90° x 90° silicone composite hybrid Tractrix horn90° x 90° square Tractrix horn
Bass extension44 Hz to 25 kHz (±3dB)62 Hz to 21 kHz (±3dB)
Sensitivity94 dB, 8 ohms93 dB, 8 ohms compatible
Power handlingUp to 100W continuousUp to 85W RMS, 340W peak
Size and weight15-13/16" H x 8" W x 13-1/6" D, wood cabinet13.3" H x 7" W x 8.5" D, 11 lbs each
Inputs and wiringDual terminals for bi-wiring or bi-ampingSingle pair of binding posts

Price history

$449.99$289.99
Nov 4Nov 9
  • Klipsch RP-600M II Bookshelf Speaker: lowest $449.99 on Nov 9 at Best Buy.
  • Klipsch R-51M Bookshelf Speakers: lowest $289.99 on Nov 4 at Amazon; $289.99 on Nov 8.

Prices at every store

Klipsch RP-600M II Bookshelf Speaker

  • electronicsexpo.comNew

    In stockReturn policy

    $399.99Observed at 10:33 PM
    Visit electronicsexpo.com
  • Best BuyNew

    In stock

    $449.99Free shippingObserved at 10:33 PM
    Visit Best Buy
  • WalmartNew

    In stockSold by Acoustic Sound Design, Inc.

    $449.99Free shippingObserved at 10:33 PM
    Visit Walmart
  • Macy'sNew

    In stock

    $449.99Free shippingObserved at 10:33 PM
    Visit Macy's
All 14 stores and price history →

Klipsch R-51M Bookshelf Speakers

  • WalmartNew

    In stockSold by Electronics Expo (Authorized Dealer)Returns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $299.99Free shippingObserved Nov 8, 2026, 8:29 AM
    Visit Walmart
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $289.99Free shippingObserved Nov 8, 2026, 8:29 AM
    Visit Amazon
  • Best BuyNew

    Availability unknown

    $399.99Observed Nov 6, 2026, 1:39 PM
    Visit Best Buy
  • TargetNew

    Availability unknown

    $399.99Observed Nov 6, 2026, 1:39 PM
    Visit Target
All 5 stores and price history →

Specs compared

SpecKlipsch RP-600M II Bookshelf SpeakerKlipsch R-51M Bookshelf Speakers
Power handlingUp to 100W Continuous Power Handlingup to 85 watts RMS (340 watts peak)
Frequency response44-25,000 Hz (± 3dB)62-21,000 Hz (±3dB)
Sensitivity94 dB93 dB
Impedance8 ohms8 ohms compatible
Height15-13/16"H10.5 in high
ColorEbony, WalnutBlack
Tweeter size1"—
Tweeter typeTitanium LTS Vented Tweeter—
Woofer size6.5"—
Woofer typeCerametallic Cone Woofer—
Horn dispersion90° x 90°—
Width8"W—
Show all 35 specsShow fewer specs
SpecKlipsch RP-600M II Bookshelf SpeakerKlipsch R-51M Bookshelf Speakers
Depth13-1/6"D—
audio purposeHome audio—
color patternWalnut, Carbon Black, Fabric, Black, Brown—
connectivity technologyWired—
materialWood—
mounting typeFree-standing—
speaker designBookshelf—
speaker technologyHorn, Dynamic—
size—One Size
Tweeter

What reviewers say

Klipsch RP-600M II Bookshelf Speaker

Owners and reviewers generally praise the RP-600M II for its dynamic, detailed sound and high sensitivity, often noting it as a clear upgrade over older speakers. Some criticize the treble as forward or bright, and a few mention the size as a drawback.

What people mention
  • Sound qualityPraisedOwners describe the sound as very nice and dynamic, especially with quality amplification.
  • TrebleCriticisedSome listeners find the horn-loaded tweeter bright or forward.
  • SensitivityPraisedThe high sensitivity makes them easy to drive with low-power receivers.
  • SizeMixedThe speakers are larger than many bookshelf models, which some see as a downside.

Klipsch R-51M Bookshelf Speakers

  • 4.8 / 5265 ratings

Rated 4.8 out of 5 from 265 ratings, the R-51M is widely liked for its lively, detailed sound and value. Owners often pair it with budget amps and small subwoofers. The main complaint is treble that can feel bright or fatiguing.

What people mention
  • SoundPraisedOwners describe a dynamic, detailed sound that fills a room.
  • TrebleCriticisedSome find the horn tweeter bright or fatiguing on long listens.
  • BassMixedBass is strong for the size, but some want a subwoofer for movies.

Questions and answers

Which is better for a small room?
The R-51M. Its smaller cabinet and lighter weight make it easier to place close to a wall or on a desk. The RP-600M II needs more breathing room to sound its best.
Which has deeper bass?
The RP-600M II. It reaches down to 44 Hz against 62 Hz for the R-51M, so kick drums and bass lines have more weight without a subwoofer.
Which is easier to drive?
Both are easy loads at 8 ohms and about 93 to 94 dB sensitivity. The RP-600M II handles more continuous power, so it can play louder with a strong amp.
Is the RP-600M II worth stepping up to?
Yes, if sound quality matters most. The larger woofer, titanium tweeter and bigger horn give cleaner detail and more bass. The R-51M is the better fit for tight spaces and simpler setups.
Which lasts longer?
Both are well built wood cabinets. The R-51M carries a 5-year warranty, which is a point in its favor for long-term peace of mind.
Do I need a subwoofer with either?
The RP-600M II covers most music without one. The R-51M benefits from a subwoofer for movies and bass-heavy music because it stops at 62 Hz.

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Buying guides that pick them

  • Best Klipsch speakers for home audio
  • Best bookshelf speakers for stereo music systems
—
1" Aluminum LTS tweeters
Horn—90x90 Square Tractrix Horns
Woofer—Dual 5.25" Spun-Copper IMG Woofers
Bass reflex—Rear-Firing Port
Dimensions—13.3" x 7" x 8.5"
Sold as—Sold in pairs
Weight—11 lbs. each
Warranty—5 years
Wireless—Yes
Configuration—2 Channel
Style—Bookshelf
Set—Yes
Connectivity—Bluetooth, AUX, Optical Audio, RCA
Max Wattage—60 W
  • SensitivityPraisedHigh sensitivity lets low-power amps play them loud.