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ELAC Uni-Fi BS U5 Slim

Bookshelf speakers (Black)

Item # 970UB5SB

ELAC's Uni-Fi UB5 bookshelf speakers earned superlative reviews from our customers and the audio world at large.

ELAC's Uni-Fi UB5 bookshelf speakers earned superlative reviews from our customers and the audio world at large.

California customers:
Please click here for your Proposition 65 warning.

Item # 970UB5SB

Ships free

Temporarily out of stock Why?

Ship date unknown

$859.98 pair

Other options

About the ELAC Uni-Fi BS U5 Slim

A taller, slimmer version of a customer favorite

ELAC's Uni-Fi UB5 bookshelf speakers earned superlative reviews from our customers and the audio world at large. Now ELAC has squeezed the same great performance into a slimmer, taller, and deeper enclosure.

A taller, slimmer version of a customer favorite

ELAC's Uni-Fi UB5 bookshelf speakers earned superlative reviews from our customers and the audio world at large. Now ELAC has squeezed the same great performance into a slimmer, taller, and deeper enclosure.

The Uni-Fi BS U5 Slims use the same drivers and high-quality crossover elements as their stockier UB5 brothers. But their sleek, Euro-inspired design features a high-quality satin painted finish. 

ELAC Uni-Fi BS U5 Slim bookshelf speaker

The ELAC Uni-Fi BS U5 Slims' cabinets are slimmer, taller, and deeper than the Uni-Fi UB5 bookshelf speakers.

The concentric difference — better sound

The Uni-Fi BS U5 Slims' concentric driver places a 1" soft dome tweeter directly in the center of a 4" aluminum midrange cone. This precise alignment creates a "unified source," ensuring that all frequencies arrive at your ears at the same instant, producing coherent, accurate sound.  

Clear, accurate bass

Each bookshelf speaker houses a custom-designed 5-1/4" aluminum cone woofer to supply articulate bass that blends in precisely with the concentric driver.

The woofer's large magnet and vented pole piece increase power handling for bass that's clean, clear, and powerful. A rear-firing port extends bass performance, but keeps it tight and tuneful.


Product highlights:

  • true 3-way bookshelf speaker design
  • custom-designed concentric driver with 4" aluminum cone midrange and 1" soft dome tweeter for clear, accurate mids and highs
  • custom-designed 5-1/4" aluminum cone woofer
  • frequency response: 46-25,000 Hz
  • sensitivity: 85 dB
  • impedance: 4 ohms
  • maximum power input: 140 watts
  • sophisticated multi-element crossover with high-grade components to ensure smooth transition between drivers
  • bass-reflex (ported) cabinet design
  • cabinet is narrower, taller, and deeper than original ELAC Uni-Fi UB5
  • internal bracing reduces cabinet vibration that causes unwanted sonic coloration
  • binding post speaker terminals
  • magnetically attached cloth grilles
  • high-quality satin painted black finish
  • 7-1/16"W x 13-3/8"H x 12-7/8"D
  • warranty: 3 years
  • Our 60-day money-back guarantee
  • MFR # BSU5-SB

High-performance amplifier recommended. See receivers & amps for this speaker

What's in the box:

  • 2 Bookshelf loudspeakers
  • 2 Grilles
  • Operating Instructions

Customer reviews

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ELAC Uni-Fi BS U5 Slim reviews

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More details on the ELAC Uni-Fi BS U5 Slim

Stacey B.

Features & specs

Enclosure Bass Reflex
Finish MDF/Vinyl
Color Black
Video Shielded No
Tweeter Type Soft-Dome
Tweeter Size (inches) 1
Midrange Size (inches) 4
Woofer Size (inches) 5.25
Woofer Composition Aluminum
Woofer Surround Rubber
Power Range 40-140
Sensitivity 85 dB
Impedance (Ohms) 4
Frequency Response 46-25k Hz
Connector Type Binding post
Bi-amp Inputs No
Height (inches) 13-3/8
Width (inches) 7-1/16
Depth (inches) 12-7/8
Weight (pounds) ---
Mounting Bracket Included No
Recommended Stand Height (inches) 24-31
Parts Warranty 3 Years
Labor Warranty 3 Years

Product Research


3-Way Speaker Design: The Elac Uni-Fi BS U5 Slim bookshelf loudspeaker employs a 3-way design with a new in-house developed concentric driver. A 3-way speaker offers many advantages in the design of a full-range system. By assigning dedicated drivers to high, midrange, and bass frequencies, each is optimized for the frequency range for which its design and material composition is best suited. The BS U5 Slim bookshelf speaker consists of a concentric midrange-tweeter driver for high and midrange frequencies, while one aluminum-cone woofer handles lower-frequency midbass and bass. At the same time, a 3-way speaker allows for a more straightforward crossover and cabinet design.

Custom-Designed Concentric Driver: The Elac Uni-Fi BS U5 Slim bookshelf loudspeaker employs a concentric driver design, combining the 1" soft-dome tweeter and 4" midrange cone diaphragm within a single voice coil. Because of its ideal time-domain characteristics, a concentric driver design delivers the most coherent and accurate reproduction across the treble and midrange frequency spectrums. Positioning the tweeter concentrically within the midrange voice coil achieves a uniform directivity pattern, for flat frequency response and formidable power handling, along with enhanced imaging for both on- and off-axis listening positions.

5.25" Aluminum Woofer: In addition to the concentric midrange-tweeter driver, the Elac Uni-Fi BS U5 Slim features one 5.25" aluminum cone woofer. Through the use of aluminum, resonances that affect the linearity of common paper cones can be placed beyond the driver's operating frequency range. An extended size magnet with vented pole piece increases power handling, for accurate reproduction of bass frequencies that are clean, clear and powerful.

Sophisticated Crossover: One secret to the great sound of the Uni-Fi series loudspeaker is the high quality, audio-grade components specified in the manufacture of each custom, 3-way crossover. This careful 3-way crossover design provides a smooth transition between the high, mid, and bass drivers.

Bass Port: The Elac BS U5 Slim bookshelf loudspeaker utilizes a bass reflex enclosure with one rear-firing flared port for greater efficiency and bigger bass response.

Robust MDF Cabinet: The Uni-Fi speaker enclosure is engineered for the long run with thick MDF outer walls and a luxurious textured vinyl finish. The Uni-Fi series cabinet incorporates specially designed internal bracing to add stiffness and strength to the cabinet's outer walls. This bracing greatly reduces cabinet vibration, which causes unwanted coloration to the sound. ELAC believes that the only parts of a speaker that should be moving are the speaker drivers themselves.

Note: The Elac BS U5 Slim bookshelf loudspeaker is available in a black or white finish (both come with black grilles).

Magnetic Grille: When the protective grille is removed, hidden magnets beneath the surface of the cabinet keeps the front-panel free of attachment holes, for a clean appearance.

Binding Posts: The Elac Uni-Fi series bookshelf loudspeaker is fitted with a set of heavy-duty, binding-post terminals which will accept bare-wire (up to 10AWG), pin-connectors, and banana plugs (single only).

Applications: The Elac Debut BS U5 Slim bookshelf loudspeaker can be used in a 2ch stereo application, or used as your front speakers and/or rear surround speakers in a multichannel home theater application.

  • 2Ch Stereo or Front Speaker Placement:  For optimum stereo imaging, place the speakers so that an equilateral triangle is created between the speakers your main listening position. You can also angle ("toe in") the speakers towards the listening position to gain a more focused central image.
  • Rear Surround Placement: In a 5.1-channel surround setup, avoid placing the speakers forward of your listening position. The speakers should be spread apart wider than the front speakers. In addition, try to elevate the speakers to the same height or slightly higher as the front speakers for the most enveloping soundfield.
Note: In either application, the speakers should be placed 1' to 2' away from boundaries such as wall and corners. Close proximity to a side or rear wall will enhance bass performance, but being too close may result in bass that is unnatural.

Mounting Options: The Elac BS U5 Slim bookshelf loudspeaker can simply be placed on a flat surface; like a table-top, stand, or shelf. The bookshelf speaker does not offer any wall-mount options.

Elac Uni-Fi Slim Series: The Elac Uni-Fi Slim series family of loudspeakers consists of a floorstanding loudspeaker, a bookshelf loudspeaker, and a center-channel loudspeaker (all sold separately). All of the Uni-Fi Slim series of speakers feature concentric driver technology. The Uni-Fi Slim series can be the basis of an outstanding two-channel system, or used to build an awe-inspiring multi-channel surround-sound system.

Optional Powered Subwoofer: Add an ELAC powered subwoofer (sold separately) to the Uni-Fi series to bring more bass to your movie and music soundtracks.

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Customer Q&A

3 questions already asked

I have vintage kenwood ka7100 integrated amp. I thought it can only handle 8 ohm speakers but these appear to be 4 ohm. The amp has 60 rms watts per channel which looks within the 40-140 watt recommendation.. will these speakers work?
[ Larry  Jul 28, 2021 ]
1 answer
We did not offer the KA-7100 amp but based on information available online, the Kenwood does appear to be able to work with speaker impedances from 4-16 ohms which means it can work with the ohms of these ELAC speakers. This combined with the Kenwood's RMS watts falling within the recommended range does indicate the Kenwood can power these speakers.
[ Paul  Jul 31, 2021 ]  Staff
why the price difference compared to the standard UB5? $250.00 more does not make sense. Same componants and specs just different shaped cabinets. HHMM?
[ Lawrence  Oct 10, 2017 ]
1 answer
Thanks for your question. For information on comparing two or more models I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences and help you make the best choice for your system and your budget.
[ Krissy  Oct 17, 2017 ]  Staff
Photo of Elac Uni-Fi BS U5 Slim with the grill on?
[ KRS03  Jun 27, 2019 ]
1 answer
I will submit a request to our photography team but the grill is basic black with a small ELAC logo at the bottom, just like the regular Uni-Fis.
[ Cosmo  Jul 08, 2019 ]  Staff

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