Product Comparison: Polk Audio S15 vs Klipsch R-51M

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General Specifications
Polk Audio
About the Product
Built to bring the big surround sound theater and music experience into the comfort of your living room, the Polk Signature S15 compact bookshelf speaker continues in the Polk tradition of American HiFi.
Leveraging a 1" aluminum tweeter matted to our proprietary Tractrix horn-loaded technology - the R-51M bookshelf speaker delivers incredible acoustics to fill your home with loud, crystal-clear sound and robust bass that no ordinary bookshelf speaker can.
Key Specs
Power RMS
20 watts
85 watts
88 dB
93 dB
8 ohms
8 ohms
Size & Weight
12 in.
13.3 in.
7.5 in.
7 in.
10.25 in.
8.5 in.
13 lbs.
11 lbs.
What customers say about "Size & Weight"
Klipsch R-51M Bookshelf Speaker
  • The bass pushed from this small speaker is impressive.
  • These are my home theater rear speakers. They are perfect for this role. Perfect size and weight.
  • Good, clear, crisp sound. Will produce an amazing amount of sound for the size.
  • These are perfectly sized with good sized woofer. These are real deal speakers for the price.
  • I was very outraged by their weight because I did not think that such small speakers could weigh so much.
Peak Power
100 watts
340 watts
Min. Frequency Response
50 Hz
62 Hz
Max. Frequency Response
40 kHz
21 kHz
Tweeter Size
1 in.
1 in.
Woofer Size
5.25 in.
5.25 in.
What customers say about "Audio"
Klipsch R-51M Bookshelf Speaker
  • The audio comes crystal clear thanks to the horn tweeter. The bass is there, but don’t expect it to blow your mind.
  • The highs and mids are perfect in this speakers, the low end is also not bad. Overall, I could not be happier with my purchase.
  • I am impressed with the sound clarity and quality, it seems as though the sound from every instrument is clearly separate and crystal clear, a beautiful thing!
  • Bass is more than enough and is extremely tight and punchy, not boomie and loose. The mids and highs are crystal clear.
  • These speakers have a very full range for my hearing and taste.
Tweeter Material
Terylene High-Res Dome
Titanium LTS
Woofer Material
Mica Reinforced Polypropylene
Dynamic Balance Acoustic Array, Power Port Deep Bass Technology, Timbre-Matched, Passive Amplification
90x90 Square Tractrix Horns, Bass Reflex, Rear-Firing Tractrix® port, Flexible Removable Grille
What customers say about "Features"
Klipsch R-51M Bookshelf Speaker
  • The Klipsch 51-M at first appearance looks good, sturdy, and well made.
  • It's amazing how much sound these can produce, even with a small amount of power.
  • Well built, almost heavy. Good easy connectors for wiring on the rear.
  • They are very well made. Corners, joints, everything, are perfect.
  • Great speakers! Sounded good when first hooked up. But after six months of use, They sound phenomenal!
Warranty / Certifications
Manufacturer Warranty
5 year(s)
1 year(s)
Other Information

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