Energy C-100B 2-Way Bookshelf Speakers, Pair, Piano-Gloss

$145.00

A 5.5-inch Composite Fiberglas woofer under a chambered 1-inch aluminium-dome Hyperbolic tweeter, 55Hz to 20kHz and usable down to 50Hz, 87dB, content from about 20 watts up. Bi-wire five-way posts with the jumpers fitted, rear port, and keyhole inserts so they can go on a wall as surrounds. Piano-black gloss baffle on a black-ash cabinet. Very good condition.

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Description

Energy C-100B 2-Way Bookshelf Speakers, Pair, Piano-Gloss

A very-good-condition pair of Energy C-100B 2-way bookshelf speakers — the smaller, more shelf-friendly sibling in the Energy C-series bookshelf line, finished in the same hand-applied high-gloss piano-black baffle that has helped make the C-series one of the most visually striking budget-friendly bookshelf families on the used market.

If you want a compact bookshelf speaker that combines acoustic excellence with genuinely premium aesthetics, the C-100B delivers on both counts. The high-gloss piano-black baffle, aluminum tweeter and woofer treatments, and clean, minimal cabinet lines give the C-100B a distinctly modern look that pairs beautifully with current AV gear and contemporary décor. Acoustically, the chambered 1-inch aluminum-dome Hyperbolic tweeter and the 5.5-inch Composite Fiberglas woofer work together to deliver smooth, accurate reproduction with the clean, detailed top end and natural, non-fatiguing midrange that the Energy C-series is known for.

The compact rear-vented bass-reflex cabinet allows the C-100B to deliver useful bass extension to 50 Hz from a footprint small enough to live comfortably on a bookshelf, a desktop, a dedicated stand, or — via the integrated keyhole / threaded-insert mounting hardware — wall-mounted as a surround channel in a 5.1 or 7.1 home-theatre system. Power handling is a generous 110 watts, sensitivity is a useful 87 dB anechoic (rising to 90 dB in-room as a stereo pair), and the speakers are happy with any quality amplifier from about 20 watts per channel upward. The 8-ohm nominal impedance (4 ohms minimum) is comfortable for any modern integrated amp or AVR.

This particular pair is in very-good cosmetic condition, with the high-gloss piano-black baffles presenting cleanly and the typical light handling marks consistent with careful use. No significant blemishes to the cabinets, grilles, or drivers.

Product highlights:

2-way bookshelf / standmount loudspeaker

5.5-inch Composite Fiberglas woofer

Chambered 1-inch aluminum-dome Hyperbolic tweeter

High-gloss piano-black baffle, black-ash cabinet

Bi-wire / bi-amp 5-way binding posts with jumpers

Rear-firing bass-reflex port

Keyhole / threaded-insert mounting for wall or stand use

Designed and engineered in Canada by Energy

Specifications:

Type: 2-way bass-reflex bookshelf loudspeaker

Drivers: 5.5-inch Composite Fiberglas woofer + 1-inch aluminum-dome Hyperbolic tweeter

Frequency response: 55 Hz – 20 kHz (±3 dB)

Usable bass response: –10 dB anechoic at 50 Hz

Sensitivity: 87 dB anechoic / 90 dB in-room (pair)

Nominal impedance: 8 ohms (4 ohms minimum)

Power handling: up to 110 watts

Finish: High-gloss piano-black baffle with black-ash cabinet

Condition: Very Good

Dimensions per speaker (W x H x D): 6.75 x 11.5 x 8.5 inches (171 x 292 x 216 mm)

Weight per speaker: 11 lbs (5 kg)

Weight per pair: 22 lbs (10 kg)

A very-good-condition pair of Energy C-100B 2-way bookshelf speakers — a compact, beautifully finished standmount design with a hand-applied high-gloss piano-black baffle, smooth aluminum-dome top end, and the kind of clean, natural musical presentation that punches well above the C-100B’s modest footprint. Excellent as a main pair in a small room, as a desktop nearfield setup, or as wall-mounted surrounds in a quality home-theatre system.

Backed by Radique Audio’s 90-day warranty and our perpetual trade-back policy, you can purchase with confidence.

Additional information
Weight24 lbs
Dimensions12.5 × 20 × 15.5 in
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.