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Definitive Technology BP-9040

Bipolar floor-standing speaker with built-in powered subwoofer

17 Reviews

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Item # 735BP9040

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C$1,199.99 each

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Our take on the Definitive Technology BP-9040

Lots of speakers can fire sound at you, but very few can project sound all around you, as well as Definitive Technology's high-performance BP-9040 bipolar floor-standing speaker. It uses a special driver configuration with both front- and rear-firing speaker arrays to surround you with rich, lifelike sound. This tower also adds a built-in powered subwoofer to the bottom of the cabinet for intense bass. Even in large rooms, every listener will experience a huge, three-dimensional soundstage with both music and movies. Plus, this speaker's sleek, modern look and cloth grille-wrapped enclosure make it a welcome addition to just about any space.

Big sound from a slim powered tower

Lots of speakers can fire sound at you, but very few can project sound all around you, as well as Definitive Technology's high-performance BP-9040 bipolar floor-standing speaker. It uses a special driver configuration with both front- and rear-firing speaker arrays to surround you with rich, lifelike sound. This tower also adds a built-in powered subwoofer to the bottom of the cabinet for intense bass. Even in large rooms, every listener will experience a huge, three-dimensional soundstage with both music and movies. Plus, this speaker's sleek, modern look and cloth grille-wrapped enclosure make it a welcome addition to just about any space.

Bipolar speaker technology immerses you in detailed sound

sound waves

Front and rear speaker arrays work together to create enveloping sound.

Here's how it works: direct sound from the front two midrange drivers and tweeter arrives at your ears first, to provide clear, focused imaging. That's followed by sound from the rear mid driver and tweeter to enhance spaciousness. The combination creates a lush, seamless soundstage that's more like the way we hear sounds in real life. And thanks to Definitive's Balanced Double Surround System (BDSS) drivers, your music and surround effects will sound clear and accurate, allowing you to pinpoint the soloist in a band or the direction of a jaguar's call in the jungle.

Powerful bass built right in

At the base of the speaker is an 8" side-firing subwoofer coupled to two 8" passive radiators. This trio creates the total radiating surface of a much larger woofer, but with better bass control, speed, and detail than a single huge driver. A built-in 300-watt amplifier powers the subwoofer, delivering deep, hard-hitting bass that eliminates the need for an external sub. And because a subwoofer is built into the cabinet, bass output is already perfectly blended with the mids and the highs. All you have to do is set the bass volume to match your room and taste, then sit back and enjoy your music and movie soundtracks.

Dolby Atmos® ready

If you're looking for an easy way to seamlessly integrate Dolby Atmos surround sound into your home theater, the BP-9040 is ready to go. Underneath this tower's handsome, removable aluminum top plate is a built-in docking port made exclusively for Definitive's optional A90 Atmos enabled speaker module.

Simply remove the plate, attach the A90 module to the port, and you're ready for an intense home theater experience. The hidden integrated connector port terminates at the base of the tower with a pair of binding post speaker terminals for connection to your Dolby Atmos compatible receiver's "Height" or "Top" outputs.

Don't have a Dolby Atmos capable receiver? Check out our selection.

Build a complete Definitive Bipolar home theater system using perfectly matched centers (see the CS-9040, CS-9060, and CS-9080) and bipolar surrounds (see the SR-9040 and SR-9080).

Did you know?

Your new speakers will probably sound better after several weeks of use than they do right out of the box. That's because the material surrounding the woofers will loosen up, allowing the drivers to move more fully. Definitive Technology estimates a break-in period of 24 to 48 hours of playback before the speakers will deliver optimum sound quality. For more information and helpful tips, check out this article from Definitive's website about conditioning your speakers.

Product Highlights:

  • Forward Focused Bipolar Array™ technology for lifelike imaging and greater speaker placement flexibility
  • built-in powered subwoofer with volume control
  • Intelligent Bass Control provides precise bass level adjustments while maintaining accurate midrange tonal balance
  • Dolby Atmos® and DTS:X™ ready with optional Definitive Technology A90 add-on speaker module (sold separately)
    • built-in docking port with speaker connector plug for A90 module under removable aluminum top plate
  • Balanced Dual Surround System (BDSS) driver technology places rubber surrounds on both the outer and inner edges of each speaker cone for improved control and clarity
  • front speaker array: dual 4-1/2" BDSS midrange drivers and 1" annealed aluminum dome tweeter with silk surround for smooth, extended highs
  • rear speaker array: one 4-1/2" BDSS midrange and 1" annealed aluminum dome tweeter with silk surround
  • 8" subwoofer with built-in 300-watt Class D amplifier
  • two 8" passive bass radiators for enhanced output
  • bass-reflex (passive radiator) cabinet design
  • frequency response: 22-40,000 Hz
  • recommended amplifier power: 50-300 watts
  • sensitivity: 92 dB
  • impedance: compatible with 8-ohm outputs
  • cloth grille-wrapped enclosure with anodized aluminum top plate
  • cast aluminum base plate with adjustable knurled carpet spikes and floor glides (for placement on hardwood and other hard surface floors)
  • two sets of 5-way binding posts (one set dedicated for optional A90 Dolby Atmos add-on module)
  • LFE line-level input (optional) for subwoofer
    • speaker-level-only connections recommended for optimum performance
  • LED illuminated front "D" logo (with rear-panel defeat switch)
  • 11"W x 39"H x 13"D (with included base)
  • warranty: 5 years speakers, 3 years electronics
  • Our 60-day money-back guarantee

What's in the Box:

  • Tower loudspeaker
  • 6.5' AC power cord
  • Top-plate (installed)
  • Stabilizer base
  • 4 Floor guides
  • 4 Carpet spikes
  • 4 Screws
  • 4 Nuts
  • Owner's Manual
  • "What Obsession Sounds Like" card

Featured Video

Very crisp mids and highs with a pleasant sophisticated bass response that fills the room nicely.

Larry, Dade City, FL


Definitive Technology BP-9040 Reviews

Average Customer Review(s):

(17 Reviews)


Larry from Dade City, FL on 10/10/2018

Crutchfield Customer Review (What's this?)

Very crisp mids and highs with a pleasant sophisticated bass response that fills the room nicely.

Pros: Great sound

Cons: Heavy at ~ 50 pounds.

Definitive Technology BP-9040

Ulisses from Milwaukee, WI on 9/6/2018

Crutchfield Customer Review (What's this?)

Beautiful sounding speakers!



Love the nicely integrated subwoofer

Ron from Leesburg, FL on 6/18/2018

Crutchfield Customer Review (What's this?)

WOW! bought these from scratch and dent for a great price. Very clean and classy looking but the crystal clear crisp sound even at low volume sets these apart. Replaced my stand alone DT sub-woofer and two front speakers from a DT pro theater system. Kept the center and rears. Totally happy.

Pros: Looks, size, sound, integrated subwoofer

Cons: none

BP 9040's sounds amazing!

Scott from Johnson City, TN on 6/11/2018

Crutchfield Customer Review (What's this?)

These replaced 25+ year old Klipsch floor standing fronts and a 12" Klipsch sub. Connected with full range speaker level input (no LFE) as is recommended in Definitive Technology literature. They are amazing! Will never miss dedicated sub. Debated heavily whether to get 9040's or 9060's - demo'd both, and very little difference - slight more range with 60's, but almost indistinguishable in smaller size room. Like with all speakers, some sources sound better than others. Overall: sound awesome, looks modern, frees up room space, and has very slick way to add Atmos!

Pros: Small foot print but big sound, bipole design, sweet looks, built in powered subs, ability to seemlessly add Atmos.


Definitive Technology BP-9040

Crutchfield customer from Budd Lake, NJ on 5/24/2018

Crutchfield Customer Review (What's this?)

Great sound experience



Definitive Technology BP-9040

Crutchfield customer from Miami, FL on 3/21/2018

Crutchfield Customer Review (What's this?)

speakers sound great with clear subwoofer operation - no distortion. Customer service is great - one speaker's LED failed to illuminate with subwoofer operation, but customer svc has a replacement on the way - no questions asked/no hassle (subwoofer sound operated fine)

Pros: look great with all cloth grill covering 360 degrees. No wood matching worries. Sound great


Definitive Technology BP-9040

Richard from Fort Myers, FL on 3/20/2018

Crutchfield Customer Review (What's this?)

I would classify myself as a middle of the road audiophile on a budget. I appreciate clean, crisp sound reproduction with solid bass. I rate these speakers head and shoulders above other brands of equal or much higher price. The built-in subwoofers give the bass response that is lacking from most of the competition. My listening room is quite large with poor acoustics. My 130W/Channel receiver is able to drive these speakers to provide the immersive experience I enjoy. Buy a pair of these speakers or spend more on another pair and then add a subwoofer to match the performance of the 9040's. Your choice!

Pros: Great sound. Built-in subwoofers. Expandable with addition of Height Module.

Cons: I tend to notice the variable quality of the source audio signal more with these speakers than my old ones. Probably because the good source material sounds so much better on the 9040's. That's a Pro not a Con, isn't it?


Raymond from Fresno, CA on 2/21/2018

Truly incredible sound from these awesome looking speakers. One of the best hands down and highly recommended. Very precise and crisp sound and massive bass when needed. Absolutely love it.

Pros: Precision, looks, price, sound quality, built quality and bass.

Cons: Nothing!!!

Good overall.

Fola from Omaha, NE on 2/18/2018

Crutchfield Customer Review (What's this?)

Built in bass is good quality and very convenient. Excellent speaker.

Pros: sturdy easy installation on board subwoofer good sound output

Cons: clumsy putting in banana plugs in the back

Definitive Technology BP-9040

Tom from Jadwin, MO on 2/14/2018

Crutchfield Customer Review (What's this?)

Bought open box........speaker has random pop in it!!!

Pros: Sounds great........except for the pop


Crutchfield response on 2/20/2018 Tom, we're sorry you're having issues with your speaker. Whenever you encounter a problem with anything you purchase from Crutchfield, please contact our Tech Support team. They can help you solve the problem or set up a return within 60 days of purchase. Lifetime tech support comes with every Crutchfield purchase.

Definitive BP9040

Crutchfield customer from Waverly, IL on 2/5/2018

Crutchfield Customer Review (What's this?)

Sounds good like the extra base missing a little separation of sound but overall I would recommend. A little over priced but like the small footprint. I sent another set of speakers back for these for size the only thing bad with Crutchfield is that they charged me 75$ to send back



Definitive Technology BP-9040

Crutchfield customer from Belleville, IL on 12/16/2017

Crutchfield Customer Review (What's this?)

Excellent sound for both music and home theater use. Definitely recommend. Crutchfield customer service is top notch!



Highly Recommended Speakers

Dr. J from N Little Rock, AR on 12/11/2017

Crutchfield Customer Review (What's this?)

These speakers sound great. The built in sub-woofer eliminated our need for a separate sub-woofer and gave us extra space in the room. Another benefit is each speaker has a bass level control. The sound is very clear and crisp and I could hear sounds in old movies that I had never heard before even though I have watched the movies numerous times. These speakers fill the room with quality sounds. I would highly recommend them.

Pros: Space Saver, great sound, looks very good


Definitive Technology BP-9040

Edward from Cary, NC on 12/10/2017

Crutchfield Customer Review (What's this?)

Great crisp sound and solid Base with the built in amps!

Pros: Compact size Incredible sound

Cons: None

Great sound, deep bass, smart design

Louis from Houston, TX on 12/7/2017

Crutchfield Customer Review (What's this?)

The expansive, boxless sound of these direct/reflecting speakers makes them great for movie sound. The built-in powered subwoofers produce deep, resonant bass for effects you can feel, and the design saves you from having to place a separate subwoofer cabinet. The tower form means you don't need speaker stands, and the feet come with both carpet spikes and flat pads for concrete, hardwoods, etc. Because I didn't read the manual, I made a couple of dumb setup mistakes but Crutchfield tech support bailed me out. First, I didn't attach the height speaker modules, so the "height channel" inputs don't do anything. I also didn't realize that I needed to connect the subwoofer outputs on the receiver to the subwoofer inputs on the speakers.

Pros: Great form factor, open sound, deep bass


Definitive Technology BP-9040

Crutchfield customer from Oak Lawn, IL on 1/28/2017

Crutchfield Customer Review (What's this?)

AMAZING!!! The sound of these speakers is just amazing. The built in subs makes life a lot easier when you have limited floor space and they have plenty of bass.

Pros: Sounds and looks great.

Cons: Can't find any.

BP-9040 bi-polar speakers

RINO from San Marcos, CA on 7/26/2016

Crutchfield Customer Review (What's this?)

Beautiful sonic clarity and I saved money by not having to replace my sub-woofer as these speakers deliver awesome base with built-in powered sub-woofers.




Hands-on research

Features and Specs

Enclosure Passive Radiator
Finish MDF/Aluminum/Cloth
Color Black/silver
Tweeter Dome
Tweeter Size (inches) 1
Midrange Size (inches) 4.5
Woofer Size (inches) 8
Woofer Composition Not given
Woofer Surround Rubber
Built-in Powered Sub Yes
Video-Shielded No
Connector Type 5-way post, RCA
Bi-amp Inputs No
Parts Warranty 5 Years
Labor Warranty 5 Years
Power Range 50-300
Frequency Response 22-40k Hz
Sensitivity 92 dB
Impedance (Ohms) 8
Subwoofer Amp Power 300
Height (inches) 39-1/16
Width (inches) 11-1/16
Depth (inches) 13-13/16
Weight 36 lbs

Product Research


Tower Loudspeaker: The Definitive Technology BP9040 tower speaker is the answer for remarkable, immersive, room-filling sound so you can experience every detail of your home theater soundtrack. Its patented Forward Focused Bipolar Array (FFBP) will expand your room's entire soundstage for an enveloping sound. An aluminum dome tweeter, high-performance midrange/midbass drivers, and an integrated powered subwoofer with Intelligent Bass Control let you hear and feel every note as the artist intended.

Forward-Focused Bipolar Array (FFBP): The Definitive Technology BP9040 tower speaker utilizes powerful, Forward-Focused Bipolar (FFBP) speaker array for wide and immersive sound dispersion. Forward Focused Bipolar (FFBP) Array offers the ultimate balance between room-filling sound and a precise center image, while giving you total placement flexibility. The FFBP array consists of a 1" aluminum dome tweeter and two 4.5" midrange/midbass cone woofers on the front and a single 1" aluminum dome tweeter and one 4.5" midrange driver on the back. By radiating sound both forward and rearward, the speaker produces sound as it is in real life, with improved pinpoint localization of soloists, greater placement flexibility, and superior intelligibility.

Aluminum Dome Tweeters: The BP9040 tower loudspeaker features two 1" aluminum dome tweeters (one on front/one of back) for crystal clear highs that bring the most demanding audio soundtracks to life. The Definitive Technology tweeters are designed to play higher in frequency than what is heard by the human ear, creating an authentic reproduction of sound as the artist intends in the studio or concert hall.

BDSS (2nd Gen) Drivers: The Definitive Technology BP9040 employs three 4.5" midrange/midbass cone woofers (two on front/one on back) with patented Balanced Double Surround System (BDSS) technology (2nd generation). BDSS technology improves driver excursion which results in the selected driver producing bass output usually associated with a larger driver, while retaining the improved dispersion and midrange definition of a smaller driver.

Integrated Powered Subwoofer: The BP9040 contains a integrated powered subwoofer that consists of a side-firing 8" woofer and 300 watt amplifier designed to extend the frequency response and dynamic range of the tower speaker. The best loudspeaker is one that reproduces balance between the highest highs down to deepest lows as accurately as possible. The integrated powered subwoofer offers deeper, more impactful bass from the tower speaker without the need to add a separate powered sub. The benefits of a built-in subwoofer include -

  • Eliminates the need for a separate subwoofer that takes up additional floor space.
  • More bass output from two subwoofers, compared to one.
  • Two subwoofers reduce standing wave room resonances and dead zones.
  • The subwoofers are perfectly integrated and blended with the mids and highs, eliminating the crossover and phase controls of a separate subwoofer.

Intelligent Bass Control: Intelligent Bass Control is Definitive Technology's latest advancement that offers enhanced bass while maintaining overall mid-range tonal balance. Intelligent Bass Control gives you the ability to modulate deep bass up or down in level while simultaneously maintaining optimal mid-range clarity regardless of where the bass control is set. Simply rotate the dial on the back of the loudspeaker to your preferred bass setting and the speaker will do the rest. Definitive Technology recommends starting at the mid-point and then adjust to your preference from there.

Dual Passive Radiators: Definitive Technology has paired its integrated powered subwoofer system with two opposite side-firing 8" passive radiators for even bigger, deeper, louder bass that you can hear and feel.

Acoustically Transparent, Resonance-Free Cabinet: The Definitive Technology BP9040 uses a resonance-free, one-piece cabinet for high performance, distortion-free sound. The speaker cabinet's maximum rigidity with strategically placed bracing improves imaging while reducing resonance, further reinforcing the speaker's clean and powerful sound. The BP9040 loudspeaker's cabinet is wrapped in an acoustically transparent cloth grille for unaltered sound. Thanks to the speaker's acoustically transparent grille, you'll enjoy the subtle elegance of the speaker design without having to remove a speaker grille to enjoy natural, uncolored sound. On the top of the cabinet is a brushed aluminum, acoustically-treated magnetic plate that finishes off the speaker cabinet nicely.

Speaker & Line Level Inputs: The Definitive Technology BP9040 tower loudspeaker is fitted with both speaker-level (binding post) and line-level (LFE/mono-RCA) inputs.

  • Binding Post Terminals: The speaker terminals are 5-way binding posts that will accommodate spade connectors, single or dual banana plugs, pin-connectors, and bare wire up to 10 gauge. By connecting the tower speaker's binding post terminals to your AV receiver's front speaker terminal outputs, the BP9040's internal crossover network distributes all frequencies to their intended drivers, and the integrated subwoofer works harmoniously with the mid-range array. In your AV receiver's menu, set the Front speakers to "Large" and Subwoofer to "No". 
  • LFE/mono-RCA Input: For those you demand greater customization, the BP9040 also features an LFE/mono-RCA input. In this setup, your AV receiver's front speaker outputs still connect to the BP9040's binding post speaker terminals, but also requires that the AV receiver's LFE/mono-RCA output to be connected to the tower speaker's LFE/mono-RCA input. This type of setup gives you the ability to control the amount of low frequencies (those below the crossover point set in your receiver) sent to the integrated subwoofer. You will need to set front speakers to "Small", subwoofer to "Yes", and the crossover point in your AV receiver to 80Hz or below to avoid disturbing the delicate blending between the subwoofer and midrange. In addition, careful balance between the subwoofer output level of your receiver and the bass control on the back of your speaker should be considered (Definitive Technology recommends starting with the bass control at 12 o'clock).
Note: Definitive Technology recommends that you do not use your receiver's auto setup functions, as they can be ineffective in setting up and adjusting speakers with integrated powered subwoofers. Configure tower speaker into your home theater system using your AV receiver's manual setup menu.

Cast Aluminum Base w/ Interchangeable Feet: The BP9040 tower loudspeaker is supported by a sturdy, cast aluminum base. The cast aluminum base's wide footprint increases overall stability of the tower speaker, while the addition of spikes or floor glides help keep your speakers firmly in place whether on carpet or other solid floor surfaces like hardwood or tile. The floor glides add approximately 0.4375" to the overall height of the tower speaker, while the spike feet add approximately 1" to the overall height of the speaker.

Note: The tower speaker must be used with the cast aluminum base for maximum stability.

Placement: The BP9040 tower speaker offers bipolar sound, meaning they will reflect sound off the back and side walls to create an incredibly broad and engaging soundstage no matter where you sit. The BP9040 tower loudspeaker is very flexible in terms of positioning and placement. To optimize performance, please follow these simple placement guidelines -

  • Setup a pair of tower loudspeakers and the main listening position in an equilateral triangle for the best stereo imaging.
  • Position each tower speaker at least 4" away from the back wall to maximize its bipolar sound.
  • Toeing the tower speakers in slightly, if possible, toward your viewing area will also provide a stronger center image.

AC Power: Because the BP9040 features a built-in powered subwoofer, you will need to connect the tower speaker to an AC outlet. The tower speaker's built-in amplifier will automatically turn-on once it's receiving an active signal from your AV receiver, and will automatically turn off after 20 minutes of no active signal.

Front-Panel LED: There is a front-panel LED "D" logo which illuminates when the BP9040's built-in amplifier is on, and turns off when the built-in amp is in standby mode. The LED "D" logo can be deactivated entirely.

Optional Dolby Atmos Elevation Module: The BP9040 features an integrated, hidden connector port that fits Definitive Technology's A90 Dolby Atmos elevation speaker module (sold separately) seamlessly. Simply remove the magnetically-sealed, acoustically treated aluminum top panel from the BP9040 tower speaker and firmly align and place the A90 elevation speaker module within the top of  the tower speaker to hear and feel Dolby Atmos multi-dimensional sound. There are dedicated binding post terminals (labeled "Height") to connect the "Height" channels of your AV receiver to the BP9040.You will also need a Dolby Atmos-enabled receiver and Dolby Atmos-encoded source material.

BP9000 Series: The BP9040 is part of Definitive Technology's BP9000 series line-up of speakers. Definitive Technology's BP9000 series loudspeakers is its 4th generation of bipolar tower speakers, matching center channels, surrounds, and a height speaker module, designed to offer true, full-range performance for listeners seeking the highest quality audio reproduction. The BP9000 series of loudspeakers consists of the BP9020, BP9040, BP9060 and BP9080X bipolar tower speakers; the CS9040, CS9060 and CS9080 center-channel speakers; the SR9040 and SR9080 surround speakers; and the A90 elevation speaker module supporting Dolby Atmos.

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At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.