Klipsch R-51M speakers — one with the grille fitted beside one without

Klipsch R-51M speaker — rear view showing the port and binding posts

Klipsch R-51M Bookshelf Speakers — New, Sealed

Name: Klipsch R-51M Bookshelf Speakers — New, Sealed
Brand: Klipsch
SKU: 12848
Price: 395.00 CAD
Availability: InStock

$395.00

The Klipsch R-51M bookshelf speakers are brand new and factory sealed — featuring the iconic 90×90° Tractrix horn, 1″ LTS aluminum tweeter, and 5.25″ copper-spun IMG woofer. With class-leading 93 dB sensitivity and bass down to 62 Hz, these are the most dynamic speakers available at this price point. Backed by Radique’s Bumper-to-Bumper Warranty and eligible for our Perpetual Trade-Back Program.

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Categories: Third Party Products, Curiosities (New), Used/Vintage, Speakers, Bookshelf / Monitors, Curiosities Tags: 93dB, bookshelf speakers, Brand New, hi-fi, home theatre, IMG woofer, Klipsch, new speakers, R-51M, Radique Audio, Reference Series, sealed box, Tractrix horn

Description

🔊 Klipsch R-51M Bookshelf Speakers — New, Factory Sealed

The Klipsch R-51M bookshelf speakers deliver the signature Tractrix horn-loaded Reference Series sound in a brand new, factory-sealed package — with class-leading 93 dB sensitivity that outperforms every competitor in this price range. If you’ve been waiting to get into the Klipsch Reference lineup without compromise, this is your opportunity.

🎺 Klipsch R-51M Bookshelf Speakers — Tractrix Horn-Loaded Performance

At the heart of the R-51M is Klipsch’s proprietary 90×90 degree Tractrix horn mated to a 1-inch aluminum diaphragm LTS (Linear Travel Suspension) compression tweeter. The LTS design keeps the voice coil in the gap at all times, minimizing distortion, while the Tractrix horn focuses high-frequency energy precisely toward the listener for exceptional detail, dynamics, and that unmistakable Klipsch front-row energy. CNET praised the R-51M’s “exciting rock and roll sound” and excellent build quality — and audiophile communities consistently highlight its wide, deep soundstage that brings recordings to life at any volume.

🏺 Copper-Spun IMG Woofer — Articulate, Efficient, Distinctive

The 5.25-inch copper-spun IMG (Injection Molded Graphite) woofer delivers articulate midrange and well-defined bass extending down to 62 Hz. The rear-firing Tractrix port applies the same horn geometry to the bass reflex design for maximum efficiency and reduced port turbulence — a detail most manufacturers skip entirely.

🎨 Build Quality & Aesthetics

Low-profile magnetic grilles with exposed copper-toned fasteners for a polished, modern look
MDF cabinet wrapped in black textured wood grain vinyl with clean, contemporary lines
Rear-panel binding posts accept bare wire, pins, spades, or banana plugs
Note: As these are factory-sealed units, product photos in this listing are stock images

📐 Specifications

Feature	Spec
Type	2-way bass reflex bookshelf (pair)
Tweeter	1″ aluminum LTS compression driver, 90×90° Tractrix horn
Woofer	5.25″ copper-spun IMG cone, rubber surround
Frequency Response	62 Hz – 21 kHz (±3 dB)
Sensitivity	93 dB (2.83V/1m)
Impedance	8 ohms
Power Handling	85W RMS / 340W peak
Connections	Binding posts
Port	Rear-firing Tractrix port
Finish	Black textured wood grain vinyl
Dimensions (each)	7″ × 13.3″ × 8.5″ (178 × 338 × 215 mm)
Weight (each)	11 lbs (5 kg)

✅ Buy With Confidence — The Radique Promise

These are brand new, factory-sealed units — backed by Radique’s Bumper-to-Bumper Warranty and eligible for our Perpetual Trade-Back Program. Very limited quantities available.

📞 Questions? Call us at 613-416-9995 or use the Ask a Question button above.

⭐ Don’t Just Take Our Word For It

Radique Audio holds over 600 customer ratings averaging 4.97 stars across six public platforms — Facebook Marketplace, Kijiji, Canuck Audio Mart, Google and others. Every rating lives somewhere we don’t control, so you can read the originals yourself, including the less flattering ones. See what our customers say. 👉

$395.00

Additional information

Weight	25 lbs
Dimensions	20 × 18 × 14 in

About brand

Klipsch at Radique

We service Klipsch, too. Bring us your own Klipsch speakers and subwoofers for repair, servicing or restoration (speakers up to 80 lbs each), with a 90-day warranty on the work. See our Audio Service page

Klipsch began in Hope, Arkansas, in 1946, when Paul W. Klipsch started building his corner-horn Klipschorn, and its Heritage speakers are still built by hand in Hope. We carry Klipsch towers, centre channels, bookshelf speakers and subwoofers. We've had more than 160 Klipsch listings so far. Every used Klipsch here is inspected, tested and serviced as required, then photographed in-house and covered by our Bumper-to-Bumper Warranty and Perpetual Trade-Back Program. Don't see the model you want? Tell us on First Dibs and we'll email you when one arrives.

The Klipsch story, 1946 to today

Paul W. Klipsch was posted to Hope, Arkansas, in 1941 as an Army officer. He patented his corner-horn design in the mid-1940s and founded Klipsch in Hope in 1946; Klipsch says its first speaker was built by hand there that year, with the horn made in a tin shed. He hired his first employee in 1948.

The Heritage line. The Klipschorn of 1946 was followed by the Heresy (1957), designed as a centre speaker to sit between a pair of Klipschorns, the Cornwall (1959), the La Scala (1963) and the Forte (1985).

A new generation. Fred Klipsch bought the company from Paul Klipsch in 1989, and headquarters later moved to Indianapolis. Paul Klipsch died in 2002 at 98. The Reference Series arrived in 1999.

A Canadian connection. In 2006 Klipsch bought Audio Products International of Toronto, with its Energy and Mirage brands. Audiovox, later VOXX, bought Klipsch in 2011, and Gentex bought VOXX in 2025.

Which Klipsch is which?

Heritage: the Klipschorn, Heresy, Cornwall, La Scala and Forte, built to order by hand in Hope. Drivers change between generations, so identify the version.

KG series (mid-1980s to early 1990s): lower-priced horn-tweeter floorstanders such as the KG 4 (1985 to 1992) and KG 5.5.

Reference (1999 onward): horn-tweeter towers, bookshelf speakers and centres, from the RB-5 and RF-7 to the later RF, RB and RC models.

Synergy (late 1990s and 2000s): such as the KSF 8.5 and the SF-1.

Subwoofers: powered models such as the RPW-10.

Buying used Klipsch: what to check

Horn diaphragms. The compression drivers in older Klipsch speakers age; owners report tired midrange diaphragms on Heritage models and raspy tweeters on some KG pairs. Listen to each horn on its own at a moderate level.

Reference tweeters. A crackling tweeter can be a loose connection, and owners say these tweeters can fail if played very loud.

Crossovers and passive radiators. Many Heritage and KG owners recap their crossovers, and KG passive radiators can have cracked surrounds.

Modifications. Aftermarket diaphragms and crossovers are common upgrades on Heritage and KG models. Ask what has been changed.

Where it was made. Heritage models are built in Hope. Check the label before calling any other Klipsch "made in USA".

Everything we list is inspected, tested and serviced as required here, and comes with our warranty.