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Definitive Technology SR-9040

Bipolar surround speaker

Item # 735SR9040

Definitive Technology's SR-9040 surround speakers will instantly immerse you in every high-speed car chase,...

Definitive Technology's SR-9040 surround speakers will instantly immerse you in every high-speed car chase,...

Item # 735SR9040

In stock
C$349.99 each

About the Definitive Technology SR-9040

Bipolar design for dramatic wraparound sound

Definitive Technology's SR-9040 surround speakers will instantly immerse you in every high-speed car chase, high-impact explosion, and bruising brawl that Hollywood blockbuster movies can deliver. Using left- and right-firing driver arrays that radiate full-range sound in an omni-directional pattern, the SR-9040s provide an enveloping listening experience that goes beyond ordinary surround speakers.
Definitive SR9040 bipole surround

The SR-9040's right- and left-facing driver arrays provide a more immersive surround sound experience.

Bipolar design for dramatic wraparound sound

Definitive Technology's SR-9040 surround speakers will instantly immerse you in every high-speed car chase, high-impact explosion, and bruising brawl that Hollywood blockbuster movies can deliver. Using left- and right-firing driver arrays that radiate full-range sound in an omni-directional pattern, the SR-9040s provide an enveloping listening experience that goes beyond ordinary surround speakers.

High-tech drivers for exceptionally detailed sound

Each driver array in the SR-9040 has a 3-1/2" midrange paired with a 1" dome tweeter, for perfectly blended highs and mids. This bipolar design creates a big, immersive soundfield. Each aluminum dome tweeter is heat-treated to relax the crystal structure of the metal, then attached to a silk surround to help produce smooth, sparkling highs that reveal delicate, low-level ambient details in soundtracks. And thanks to Definitive's Balanced Double Surround System (BDSS) driver design, your movie special effects and multichannel music will sound clear and detailed. These mid/woofers disperse the sound over a wide area in your room so that even viewers sitting off-axis hear engaging surround sound.

Versatile placement options

Definitive's bipolar surrounds aren't fussy about placement — they shine in a variety of room sizes and shapes. A pair of SR-9040s works well on your side walls for 5-channel systems, or on the side and rear walls for a 7-channel system. Each speaker has a keyhole slot for on-wall installations. You can also place this speaker on a shelf or stand and get great results.

Build a complete Definitive home theater system using perfectly matched bipole towers (see the BP-9020, BP-9040, BP-9060, and BP-9080X) and center channel speakers (see the CS-9040, CS-9060, and CS-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:

  • bipolar speaker design with wide sound dispersion for enveloping surround effects
  • 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
  • left and right speaker arrays each include a: 3-1/2" BDSS mid/woofer and a 1" annealed aluminum dome tweeter with silk surround
  • frequency response: 50-40,000 Hz
  • sensitivity: 92 dB
  • impedance: compatible with 8-ohm outputs
  • recommended amplifier power: 25-150 watts
  • one set of 5-way binding posts
  • keyhole slot for wall mounting
  • high-gloss black finish on top and bottom caps with cloth grille-wrapped enclosure
  • 7-7/8"W x 9-1/2"H x 5-3/8"D
  • warranty: 5 years
  • Our 60-day money-back guarantee
  • MFR # MEBA-A

What's in the box:

  • Bipolar surround loudspeaker
  • 2 Grilles (installed)
  • Owner's Manual

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More details on the Definitive Technology SR-9040

Stacey B.

Product Research


Surround Speaker: The Definitive Technology SR9040's bipolar speaker dispersion pattern provides enveloping surround sound, tremendous dynamic range as well as true high-definition sound quality, which results in total soundfield immersion. This compact, high-quality bipolar speaker is intended primarily for use as a surround or surround back speaker. In addition, it can also be used as front "effects" speakers in multichannel DSP systems.

Bipolar Design: The Definitive Technology SR9040 is a bipolar surround speaker, containing two full-range woofer and tweeter arrays. The speaker cabinet has three sides, with the driver arrays firing in phase approximately 100° apart to flood the area with sound and the third side mounts against the wall. Dispersing the surround channel's sound evenly over a broad area of the room creates an enveloping home theater experience.

Aluminum Dome Tweeters: The SR9040 bipolar surround speaker features two 1" aluminum dome tweeters for crystal clear highs that bring the most demanding audio soundtracks to life. 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 SR9040 employs two 3.5" midrange cone woofers 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.

Resonance-Free Cabinet w/ Acoustically Transparent Grilles: The Definitive Technology SR9040 uses a resonance-free cabinet w/ acoustically transparent grilles 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. Thanks to the speaker's acoustically transparent grilles, you'll enjoy the subtle elegance of the speaker design without having to remove a speaker grille to enjoy natural, uncolored sound.

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.

Mounting Options: The SR9040 has a rear-panel keyhole slot for wall-mounting. It can also be simply placed on a shelf or stand.

Placement: For use surround speakers, position the speakers approximately 6' high and directly beside or 1-2" behind the listening area. For use as surround back speakers, position the speakers approximately 6' high and 6' apart directly behind the listening area.

BP9000 Series: The SR9040 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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Customer Q&A

Crutchfield asked: Why did you buy this?
frequency response 1db away from Klipsch rp-402's and price was more in the range.For a 1db diff. this was a no brainer. [ Ric  Apr 27, 2020 ]
Our recent good experience with Definitive Technology (subwoofer and front channel speakers) combined with the reviews and price point led us to choose these for adding to our surround sound system. We're looking forward to testing them out soon. [ Bruce  Dec 14, 2019 ]
The ratings [ Brian K.  Mar 07, 2019 ]
I have a set of Definitive Tech speakers Pro 1000 for front, Pro 800 for rear, plus a matching center speaker and subwoofer. I wanted to add side speakers to go to Dolby 7.1. These seemed to be the right speakers to expand on what I already have. [ Mark  Mar 05, 2019 ]
Perfect design for middle left and right surround channels for multiple rows of theater seating. Sound will be dispersed towards both the front and rear seats. [ Mike  Mar 03, 2019 ]
Wide dispersion [ Joseph  Aug 21, 2018 ]
Based on the reviews and recommendations. The sale price helped my decision also. [ Stanley  Aug 20, 2018 ]
Wanted to get matching surrounds for Definitive Technology Fronts and Center speakers recently purchased. [ Jon  Jan 01, 2018 ]
The SR-9040 was recommended by Hogan. He said that they will compliment the Mythos Gems that I placed in my first order # 44529504. [ E  Dec 31, 2017 ]
My theatre system I have is Definitive Technology so all I need it is these SR 9040 to complete the whole project. thanks [ JORGE E  Oct 09, 2017 ]
Good experience with Definitive's products [ James  Aug 29, 2017 ]
To match my Def 9020 [ Luis  Aug 04, 2017 ]
I have Definitive Technology front and center speakers now and wanted matching surround speakers. [ Timothy  Jul 25, 2017 ]
Front atmos [ Daniel  Jun 19, 2017 ]
Compliment my 8040 Bi-Polar Floor Speakers [ Michael  Dec 23, 2016 ]
decision based on Doug's recommendation intended to complement my center and tower Def Tech 9000 series speakers Doug's Bio: [ Rico Barolo  Aug 30, 2016 ]

3 questions already asked

Can this speaker be used as a single (mono) back surround, or is it meant to be used a full surround system, 2 units?
[ daniel  Feb 05, 2019 ]
6 answers
They sound beautiful in a pair for rear surround
[ Anthony  Feb 05, 2019 ]
It only has input for one channel. You cannot hook both a left rear channel and a right rear channel to only one speaker. Thus to do surround you need two speakers.
[ Joseph  Feb 05, 2019 ]
I am using this as a single mono back speaker. My room did not allow for two surround back speakers. In my opinion the bi-polar design of this surround speaker makes it perfect for that application.
[ Otterb  Feb 05, 2019 ]
I think it would work good, it should fill the area close to as if 2 were there
[ Leland  Feb 05, 2019 ]
Hi Daniel, Yes. You use it as a single mono speaker. It will just split frequencies between the drivers to recreate an ambiance sound feeling. But, it's better and recommended to use it in pairs and channeled according the room configuration so you can create the intended ambiance, and have the best surroundIng theather sound experience. I have two of them as surround back channels in a Dts:X system. The sound, amazing immersive rich sound. -Sergio-
[ SERGIO  Feb 05, 2019 ]
I would recommend purchasing two speakers, why deny yourself great sound. I have a pair used for back surround and they are great. One speaker could limit the surround sound experience in my opinion. I have not regretted my purchase at all. Good luck, hope that helps.
[ Paul  Feb 05, 2019 ]
Can the sr9040 be used as height speakers?
[ Eddie  Nov 26, 2018 ]
1 answer
Negative, you have two speakers that face opposite directions it won't be any use as a height speaker.
[ Stanley  Dec 03, 2018 ]
Mounting Bracket - Def Tech SR9040 I am trying to find an adjustable mounting bracket that will work with the keyhole style on the Definitive Technology SR9040 speakers. Any thoughts?
[ Marc  May 01, 2017 ]
2 answers
Hi, I didn't look for a bracket, mounted the speaker on a appropriate size screw, pulled the wires out of a hole I made in the wall to coincide with the speaker terminals and it looks perfect. I figured when I'm no longer using the speakers I'll only have four little holes to spackle.
[ Albert  May 02, 2017 ]
Try these it says they are compatable with the single keyhole slot
[ Paul  May 02, 2017 ]

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Definitive Technology SR-9080
Bipolar surround speaker
Out of stock
16 reviews
C$499.99 each
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Bigger drivers for deeper sound

The Definitive Technology SR-9080 offers these features:
  • dual 4-1/2" woofers for bass down to 40 Hz
  • power handling up to 200 watts
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