Energy C-50 bookshelf speakers with grilles off: gloss black baffles, each with a tweeter in a grey waveguide plate above a silver-capped woofer

Angled view of the Energy C-50 pair showing the black ash side panels and gloss black front baffles with grey tweeter plates

Energy

Energy C-50 Bookshelf Speakers, Pair – Ultra-Compact, Black Ash

Name: Energy C-50 Bookshelf Speakers, Pair – Ultra-Compact, Black Ash
Brand: Energy
SKU: 20490
Price: 145.00 CAD
Availability: InStock

$145.00

A pair of ultra-compact Energy C-50 bookshelf speakers, designed and engineered in Canada, in black ash with gloss black front baffles and their black cloth grilles. They have been tested on our bench and are in very good condition.

✔️ Very good condition — black ash with gloss baffles, grilles included
✔️ 1-inch aluminum tweeter and 4½-inch woofer, video-shielded
✔️ Five-way binding posts — designed and engineered in Canada
✔️ Covered by Radique Warranty
✔️ Includes Perpetual Trade-Back Program eligibility
✔️ Expertly packed for safe shipping

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Description

A pair of ultra-compact Energy C-50 bookshelf speakers, designed and engineered in Canada, in black ash with gloss black front baffles and their black cloth grilles. They have been tested on our bench and are in very good condition.

What it is

You’ll be impressed, if not amazed, by the big, clear sound and small footprint of Energy’s C-50 bookshelf speakers. Energy speakers are known for delivering flat frequency response, for even, accurate sound throughout your listening room. Each C-50 has a one-inch aluminum dome tweeter that produces crystal-clear highs, plus a 4½-inch composite fibreglass woofer that delivers surprising low-end oomph for its small size, in a bass-reflex cabinet ported at the back.

The ultra-compact cabinets fit easily on almost any shelf, and they sit well on stands. Pair them with a subwoofer for muscular, full-range sound, or use them as surround speakers. Nice design touches include the high-gloss front baffle, metal grille posts (no more broken plastic clips here) and an integrated metal grille protecting each tweeter. They are video-shielded, so they are safe to place right beside a TV, and Radique Audio High Density Felt pads in our signature Magenta on the base protect your furniture.

Around the back, one pair of five-way binding posts per speaker takes bare wire, spades, pins or banana plugs. We recommend our own Radique Audio gold-plated banana plugs, and our Custom Speaker Cable Builder will make a pair to length, ready to plug in.

The service it has had

Tested on our bench before listing.

Condition

Very Good, and free of significant marks. The black ash cabinets and gloss baffles present well, and the black cloth grilles are included. One thing to know: the wall-bracket fitting on the back of one speaker can’t take a bracket, so this pair is best on a shelf or stands rather than on the wall.

Big, clear sound from a small Energy, ready for your shelf.

Available for pickup in Kanata, or shipped across Canada and internationally — we have sent equipment to fifteen countries in the past year, each piece packed in-house in 275 lb test double-wall boxes. Live shipping rates for your address are calculated at checkout. Backed by Radique Audio’s Bumper-to-Bumper Warranty and our Perpetual Trade-Back Program. Available for audition by appointment in Kanata.

Energy C-50 Specifications

Type: two-way bass-reflex bookshelf speakers, rear-ported, sold as a pair
Tweeter: 1″ aluminum dome, with an integrated metal grille
Woofer: 4½″ composite fibreglass cone
Frequency response: 65 Hz–20 kHz ±3 dB
Sensitivity: 85 dB
Impedance: 8 ohms
Power handling: up to 100 watts
Video-shielded
Terminals: one pair of five-way binding posts per speaker
Finish: black ash, gloss black front baffle, with black cloth grilles
Designed and engineered in Canada
Dimensions: (Width x Height x Depth) 5.75 x 8.7 x 8.1 inches (146 x 221 x 205 mm), each
Weight: approx. 6.6 lbs (3.0 kg) each

🔌 Speaker Cable, Built on Our Own Bench

The speaker terminals here are five-way binding posts, so they take banana plugs or spade lugs and you have the run of the options. We hand-build speaker cable here in any length you need — choose the gauge and the terminations on our Custom Speaker Cable Builder. If you would rather terminate cable you already own, we make our own gold-plated banana plugs and spade connectors as well. 👉

✅ Buy With Confidence — The Radique Promise

Backed by Radique Audio’s Bumper-to-Bumper Warranty and our Perpetual Trade-Back Program. When you’re ready to move on, we’ll take it back. That’s the Radique difference.

📦 Watch how we protect your gear — our unboxing video.

📺 Curious about our business? Check out our YouTube channel for behind-the-scenes videos and more!

📞 Questions? Use the Ask a Question button above, or call us at 613-416-9995.

$145.00

Additional information

Weight	15.2 lbs
Dimensions	12.1 × 17.5 × 12.7 in
Impedance	8 Ω
Power Handling	51–100 W
Sensitivity	Under 86 dB
Woofer Size	5″ and under

About brand

Energy at Radique

We service Energy, too. Bring us your own Energy 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

Energy is a Canadian speaker brand from Audio Products International (API) of Scarborough, Ontario, the same company and factory behind Mirage. API was founded in 1973, and the Energy brand dates from the late 1970s or early 1980s. We carry Energy bookshelf speakers, towers, centre channels and subwoofers. We've had more than 170 Energy listings so far, covering more than 75 different models. Every used Energy 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.

Our five best-selling Energy models so far: the RC-mini bookshelf speakers, the e:XL-S8 and ESW-8 subwoofers, the e:XL-C centre and the C-300 towers.

The Energy story

Howard Heiber founded Audio Products International in 1973 in Scarborough, Ontario, as a builder of private-label speakers. Energy says its brand dates from 1973; other sources point to the late 1970s or early 1980s, when API took on the Energy and Sound Dynamics names.

Research in Canada. Energy took part in the National Research Council of Canada's listening-test research from 1977 to 1986, and its speakers were built at API's Scarborough factory, which it shared with Mirage.

Veritas and Connoisseur. The Veritas v2.8 flagship was shown at the 1993 Winter CES, and the Connoisseur series followed in the mid-1990s. The Take 5 satellite system arrived in 1997.

New owners. Klipsch Group of Indianapolis bought API, with Energy, Mirage and Athena, in August 2006, and production moved to China around 2006 to 2007. VOXX bought Klipsch in 2011, and Gentex bought VOXX in 2025.

Which Energy is which?

Veritas (1993 onward): the flagship line, such as the three-way v2.8.

Connoisseur (mid-1990s to mid-2000s): models such as the C-2, C-3, C-6 and C-8.

Reference Connoisseur (RC): including the RC-70 towers and the RC-mini, one of our best sellers.

Take 5 and Take Classic (1997 onward): small satellite-and-subwoofer systems.

XL and e:XL (2000s): the entry line. Our best-selling e:XL-S8 subwoofer and e:XL-C centre come from here.

C-series (late 2000s): the vinyl-finished budget line, from the C-50 to the C-500, including the C-300 towers.

Subwoofers: the ESW and S-series, such as the ESW-8 we sell often.

Buying used Energy: what to check

Aluminum-dome tweeters. Owners report broken tweeters on some Connoisseur models. Look closely for dented or cracked domes.

Powered subwoofers. Owners report failed plate amplifiers on some S-series subs. Any sub should play cleanly at volume.

Surrounds. Most Energy woofers of the 1990s and 2000s use rubber surrounds, but some models, such as the RVSS dipole, used foam. Press gently on each woofer surround.

Where it was made. Energy speakers were made in Scarborough into the mid-2000s and in China from about 2006 to 2007. Check the rear label if Canadian manufacture matters to you.

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