The Klipsch R-51M ranks #87 out of 92 total Medium Size Bookshelf Speakers for sound quality. See all Passive Home rankings for every top pick.
Brand: Klipsch
Prices on this page were last checked October 3, 2026 at 10:26 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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#87 Klipsch R-51M: $289.99 per pair Passive Amazon eBay
Pros: A high-efficiency 5.25-inch passive bookshelf speaker featuring Klipsch’s 90 x 90 square Tractrix horn mated to a 1-inch aluminum LTS tweeter and spun-copper IMG woofer. Delivers high sensitivity (93dB @ 2.83V/1m) that allows it to achieve loud volume levels effortlessly even with low-powered budget amplifiers. Rear-firing Tractrix port provides clean, tight punch down to approximately 62Hz at -3dB, offering noticeably fuller low-end weight than the smaller 4-inch R-41M. Measured bass extension of 62Hz (-3dB).
Cons: Anechoic NFS measurements from Erin’s Audio Corner and ASR reveal significant tonal colorations: a sharp treble boost between 2kHz and 6kHz combined with a recessed upper midrange creates a bright, sibilant presentation that causes listener fatigue over time. Requires aggressive DSP/EQ correction to achieve neutral tonal accuracy.
How it compares: Just above it: Pioneer Elite SP-EBS73-LR - $459 more, 8Hz lower bass extension (-3dB). Just below it: Jamo C 93 II - $9 more, 9Hz lower bass extension (-3dB).
| Bass Extension (-10dB) | 48Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 62Hz (measured, Erin’s Audio Corner) |
| Crossover Frequency | 1660Hz |
| Dimensions | 13.3” x 7” x 8.5” (338 x 178 x 215 mm) |
| Drivers | 1” aluminum LTS tweeter on 90x90 Tractrix horn, 5.25” spun-copper IMG woofer |
| Frequency Response | 62Hz - 21kHz (+/- 3dB, Manufacturer specified) |
| Impedance | 8 ohms |
| Passive | Yes |
| Sensitivity | 93dB (2.83V @ 1m) |
| Weight | 11 lbs (5.0 kg) each |
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