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Definitive Technology

Definitive Technology Black Bookshelf Speaker - SM55B

Abt Model: SM55BK | UPC Code: 093207089244
Definitive Technology - SM55B - Bookshelf Speakers
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Sold As Each/ One 6.5 Inch BDSS Cast Basket Driver/ One 1 Inch Pure Aluminum Dome Tweeter/ 32Hz To 30kHz Frequency Response/ 90dB Sensitivity/ Black Finish
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Your Shipping Zip Code: 20147 (change)

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Feb 10th - Feb 11th *

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Product Details

Definitive Technology Studio Monitor 55 Black Bookshelf Speaker, Model SM55BK (Sold As Each)

Key Features:

  • Second generation patented 6-1/2" BDSS mid/bass driver with Linear Response Waveguide technology for flat, accurate response with micro-detail retrieval and three-dimensional imaging
  • Cast aluminum driver baskets
  • Second generation pure aluminum dome tweeter for smooth, extended highs
  • Top-mounted racetrack bass radiator for outstanding bass response
  • Non-resonant braced enclosure ensures pure, uncolored performance
  • High-gloss anti-diffraction baffle and shaped enclosures reduce diffraction for open and spacious imaging
  • Crossover network features oversize inductors and premium Mylar capacitors for audiophile-grade sound quality
  • Integrated Zobel network makes the SM55 easy for amplifiers to drive
  • Bi-amp/bi-wire all-metal 5-way binding posts


  • Redesigned From the Ground Up for Superior Performance, Utility and Beauty
    The new Definitive StudioMonitor series is the culmination of over 20 years of research and development to create monitor-quality shelf speaker with the perfect balance of high style, utility and most of all performance.
  • The Most Advanced Technologies for the Most Advanced Performance
    If you love great sound you must experience Definitive’s StudioMonitor 55. Its combination of racetrack bass radiator technology, and our latest generation patented Balanced Double Surround System (BDSS) bass/midrange drivers, all housed in a rock-solid attractive enclosure, delivers unsurpassed sonic performance.
    Each SM 55 features a cast-basket 6-1/2" (17cm) second generation BDSS midrange driver and a 1" (25mm) pure aluminum dome tweeter. The driver features Definitive’s patented Balanced Double Surround System (BDSS) technology that supports the speaker cone at both the inner and outer edges allowing longer, more linear excursion for greater clarity and finely textured inner detail. A new patent pending Linear Response Waveguide™ smoothes off-axis frequency response and disperses sound over a wider area for crystal clear intelligibility for every listener in the room. The tweeter is a pure aluminum dome, which has been heat-treated to relax the crystal structure and then coated with a ceramic to produce extended highs that reveal nuance and shimmer without a trace of edginess.
    The BDSS long-throw bass/midrange driver is pressure coupled to a top mounted racetrack bass radiator to extend and amplify bass frequencies. The total bass radiating are of a SM55 is substantially greater than that of a single 10-inch woofer but with far greater control, definition and speed than a single sluggish large woofer. The StudioMonitor’s bass performance is nothing short of astonishing in its depth, detail and musicality.
  • Phase-Coherent Crossover Networks
    The crossover network is the real heart of a loudspeaker as it is responsible for perfectly blending together the sound of the various drivers into a musically seamless whole. The sophisticated design used in the SM55 features premium audiophile-grade components such as oversized inductors, Mylar capacitors for linear phase and frequency response. An integrated Zobel network flattens the impedance of the system so that even budget amplifiers will be able to drive the SM55 loudly without distortion (although a premium amplifier will bring out all the performance this remarkable speaker has to offer). This preserves the phase coherence, transient response and dynamic integrity of the signal for absolutely lifelike music and home theater reproduction in your home.
  • Slim Elegant Styling - Rock Solid Performance
    All the driver and crossover technology in the world would be wasted if housed in a resonance-prone box. We devoted as much Design and Engineering attention to the styling and construction of the StudioMonitor 55’s enclosure as any other part of its design. The specially contoured high gloss baffle around the drivers and the tapered enclosure sides enhance sound quality by minimizing diffraction distortion. The decorative high gloss grille and cabinet accents add elegance to the matte black tower the way satin piping adds dash to a tuxedo. But the enclosure’s most important job is to be totally inert and resonance free so as not to color the sound. And that’s just we did in engineering the SM enclosures. Internal MDF cross braces further stiffen the system. Tap on the side panel of a StudioMonitor 55 enclosure to hear the solid “thud” of a solid, well-damped cabinet instead of the hollow ring of a poorly constructed speaker.


  • Driver ComplementOne 6-1/2" BDSS cast basket driver pressure coupled to one 6"x10" low bass radiator, one 1" pure aluminum dome tweeter
  • Frequency Response 32Hz - 30kHz
  • Nominal Impedance 8 Ohms
  • Sensitivity 90dB
  • Recommended Associated Amplifier Power 20-225 Watts
  • Inputs Bi-amp/bi-wire 5 way binding post terminals
  • Enclosure Braced MDF
  • Finish Wood grain matte black enclosure with high gloss black baffle and trim

Approximate Dimensions:

  • Height:13"
  • Width: 7–7/8"
  • Depth: 12–3/8"

Approximate Weight:

  • Shipping: 32 lbs

Warranty Information:

  • Manufacturer Warranty (authorized online retailer): 5 Years
  • Extended Service Warranty Available: Click the warranty tab above for details



** Sold as pair **

More reasons to buy the Definitive Technology SM55B from Abt Electronics
  • is an authorized dealer (Learn More).
  • The Definitive Technology SM55B is Brand New.
  • The Definitive Technology SM55B Ships in a Factory Sealed Box.
  • Abt ships this product for free!
Frequency Response32Hz - 30kHz
Enclosure MaterialWood
Enclosure TypePassive Radiator
Impedance8 Ohms
Magnetic shieldingNo
Power20W - 225W
Sensitivity90dB spl (2.83 V/m)
Speaker Design2-Way
Speaker TypeBookshelf
Tweeter Size (inches)1
Woofer Size (inches)6.5
Height (inches)13
Width (inches)7.88
Depth (inches)12.38


by PowerReviews
Definitive Technology Black Bookshelf Speaker

(based on 1 review)

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Reviewed by 1 customer

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Just Buy and Try


from Antioch,Il

About Me Midrange Shopper

Verified Buyer

Comments about Definitive Technology Black Bookshelf Speaker:

Best ive ever purchased.Looked at many types and sizes.Towers to Sattilites.This was an awesome upgrade from Pro Monitor 800 system that I also bought from Abt.You truly will not be disappointed,If you are Abt will take it back without hasle.I could say about soundstage,filling the room,presence,all the terms used to describe todays speakers,but the proof is in listening to them.My receiver sony4400es allows bi-amp and when I did the speakers came alive.Surprise,the speaker is so effiecent,and rated 20/225 I didn't think it was necessary.Runnin 120 watts per channel,no clip.Also let me say I upgraded l/r/c with sm55 and 8040c,i had ordered 4 sm55 but put 2 of these in my home office for computer music with an older sonystrda695 I bought a very long time ago from Abt.The office 10x16,the sound is outstanding,sitting very close listening to as they say things you've never heard.Yes a dac and amp like Peachtree would be nice but they still sound clear and loud.Theres obviously more but let me say thanks to abt for having a store where you can go instead of just a page you stare at.Let me say also before my purchase I contacted Def Tech my email was answered promptly,make that several emails,all my questions answered by Chet.Being older 58 to be exact todays technology is at the least very complicated.Ask for help from Abt experts and also the manufacturers of the products make it a good experience.

Service and delivery comments:

Absolutely Perfect

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Definitive Technology Black Bookshelf Speaker

Definitive Technology Black Bookshelf Speaker

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