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Our No-Compromise Ultra-High-Performance Compact LCR Speaker

With the success and overwhelming feedback from our Luna mini-monitor, it was time to take that same formula and apply it to a speaker designed specifically for use as both a main and center.

Featuring a custom RAAL true ribbon tweeter and 2 of our exclusive 4.5" SEAS Curv™ woofers all combined in our remarkable low resonance layered bamboo cabinet.


100% MONEY




For many years now, as space for audio systems has decreased, our customers have continually requested a high performance yet compact center speaker that can fit almost anywhere. Building on the feedback from our Luna mini-monitor, we took that successful design and added a second Luna woofer, thus increasing efficiency, reducing distortion, and increasing overall output. We then tuned the response a bit more like our Horizon slightly favoring midbass over bass extension to give the Duo a dynamic and punchy sound.

We were so impressed with the final result that labeling the speaker as a center would limit the Duo's overall usage as these speakers make stunning left/right mains when combined with a subwoofer. They easily keep up with speakers significantly larger, providing dynamics, punch, and a soundstage that truly belies their small size.

It was an easy decision to use the same custom RAAL ribbon tweeter used in our Sierra-2, Sierra-2EX and Luna - this tweeter is simply remarkable and has well earned its reputation for being one of the best available.

But the woofer is just as important and taking full advantage of our relationship with SEAS of Norway, they nailed the design for us. We went through more prototypes for this woofer than we have for any other transducer we have ever had made for us.

Combined with an advanced crossover and all housed into a stunningly beautiful FEA and advanced 3d CAD designed Made-In-The-USA layered bamboo cabinet, these speakers beg to be both heard and seen!

The Duo has exceptionally wide and linear horizontal dispersion thus it presents a shockingly large and enveloping soundstage, even in large rooms. Its performance belies its small size in such a way that in our many public auditions of the Duo’s, listeners continually throw out comments stating “these speakers sound so much bigger than they are”.

Hand assembled, tested and packaged in the USA, we are so confident of the component and build quality of the Duo that we are backing it by a comprehensive 7 year parts & labor warranty. Left / right pairs are matched by hand to within ± 1dB and we are including a printout of the actual production line response measurement of each speaker.

We dare say it, but you simply cannot find this type of quality control, care and pride from products that are fully assembled and tested in overseas manufacturing facilities.

We must warn you though, once you have heard what these RAAL true ribbon tweeters are capable of, there simply is no turning back...

We thank you for your interest!



  • All Duo LCR are hand assembled, tested and packaged at our factory in Orange County, CA.
  • A serialized production line frequency response measurement is included with each speaker.
  • 7 year manufacturer's warranty + 30-day satisfaction guarantee.


  • Exclusive 3-ply vertically laminated bamboo cabinet construction dramatically reduces cabinet resonance for a cleaner, more detailed, and transparent performance.
  • Cabinet is a stunningly beautiful natural hardwood finish, there are no veneers and as such, no need to be concerned about peeling veneers or wraps or veneer cracks.
  • Cabinet is fully environmentally friendly as the bamboo we source is a completely renewable resource.


  • Fully custom manufactured by SEAS of Norway to our specifications and exclusive to Ascend Acoustics.
  • Long-throw design for high power handling and extended bass.
  • Exceptionally large magnet system combined with symmetrical driving force.
  • Specially designed high loss natural rubber surround to improve damping and resonance control, critical for smaller cones.
  • SEAS’s exclusive SpiderRing® technology improves suspension alignment for higher long term reliability, improved power handling and improved mechanical linearity.
  • Injection molded cast frame for a stiffer basket frame combined with large windows allowing for less material behind the woofer cone reducing back-wave reflections for enhanced detail, better airflow and less cavity resonance.
  • Vented pole-piece and open spider for enhanced air-flow and cooling, minimizing compression artifacts.
  • SEAS Curv™ cone technology that is extremely low mass, stiff, and provides exceptional self-damping providing greater detail while remaining smooth with no harsh cone break-up modes.


  • Fully custom true ribbon tweeter manufactured by RAAL in Serbia to our specifications.
  • True ribbon tweeter has no voice coil, the pure aluminum ribbon is the only electrical conductor and the only moving part.
  • Extremely low moving mass design, typically less than 1/50th the mass of a dome tweeter, enabling near instantaneous acceleration / deceleration, and no stored energy all combined to provide near perfect transient reproduction.
  • Class-leading horizontal dispersion width provides a huge soundstage and precise imaging.
  • High powered neodymium magnets in a unique homogenous design (equal strength magnetic field throughout the entire ribbon area) provides lower distortion and less stress on the ribbon diaphragm.
  • Critically damped rear chamber to absorb the back wave of the ribbon diaphragm, improving frequency response linearity and overall transparency.


  • Dual layer design separating the tweeter network from the woofer network.
  • Metallized polypropylene capacitors in the direct signal path.
  • Air-core inductors in the direct signal path.



Typical In-Room Frequency Response 60Hz - 27kHz
Typical In-Room Sensitivity 90dB @ 2.83v / 1 meter
Nominal Impedance 8 ohms
Max Continuous Power* 150 watts
Max Short Term Peak Power* 250 watts
Cabinet Detail Exclusive V-LAM™ construction featuring 20mm thick vertically laminated bamboo, internally braced. Bass reflex via dual flared front slot ports. Fully magnetic speaker grille with no visible mounting parts
Tweeter Custom made RAAL true ribbon tweeter featuring a 10mm wide pure aluminum ribbon with a total moving mass of less than 1/100th of a gram
Woofer (2) Proprietary 4.5” long-throw dual compliant Curv™ woofers, non-resonant cast frame, SEAS SpiderRing® technology, vented pole-piece and vented spider. Custom manufactured for us by SEAS of Norway and exclusive to Ascend Acoustics
Connections (2) gold plated all metal 5 way binding posts
Inserts (2) 1/4-20 threaded inserts for simple mounting to wall mount brackets
Anechoic Frequency Response 80Hz - 27kHz +/- 3dB
Anechoic Sensitivity 87dB @ 2.83v / 1 meter
Dimensions H x W x D** Vertical orientation: 16.25" x 5.75" x 6.0"    Horizontal orientation: 5.75" x 16.25" x 6.0"
Speaker Weight (each) 14 pounds
Shipping Weight (pair) 30 pounds
Minimum Recommended Power At Listening Position for Specific Speaker Distances
3 Feet or Less 2 watts minimum
9 Feet or Less 16 watts minimum
15 Feet or Less 46 watts minimum
21 Feet or More 91 watts minimum
     *Unclipped peaks      **Grille On



*All measurements taken using DRA Lab’s MLSSA system with RCAI, calibrated ACO Pacific 7012 ½” free field measurement microphone with associated pre-amp and power supply and an automated Outline turntable.

Full-range quasi-anechoic on-axis frequency response @ 1 meter unsmoothed speaker positioned vertically:
Duo Frequency Response Graph

Horizontal and vertical off-axis graphs plus listening window:
Duo Off-Axis Graph
Note: Listening window is the averaged response of 5 separate measurements, on-axis, +/- 15 degrees horizontal and +/- 15 degrees vertical. Due to the measurement technique, the response below 250Hz is invalid, as represented by the above and below horizontal green bars.

Polar Response:
Duo Polar Response
Note: 5 degree increments from 0 degs to a full 90 degs off-axis. Note how the critical midrange response remains linear and consistent with uniformly decreasing spl as frequency increases. This represents an exceptionally wide off-axis response.

Impedance and electrical phase:
Duo Bode Plot
Note the extremely clean impedance response (free from wrinkles which would represent various forms of resonances) and linear phase with minimal phase angles. The mild phase angles ensure that this speaker is an easy load for even basic receivers.

Energy Time Curve:
Duo ETC Graph
This measurement is a good indication of overall transient accuracy and stored energy. The graph displays the decay time of a full range impulse. The impulse occurs at 3ms and decreases uniformly to the noise floor (-45db) by 4ms. This represents a decay time of 1ms, which is superb. Large diameter woofer cones, woofers and tweeters with poorly designed motor systems and/or heavy mass and poorly constructed cabinets will often contribute to far greater decay times which damage transient accuracy, coherency and overall resolution.

Cumulative Spectral Decay:
Duo CSD Graph
This measurement is similar to the energy time curve but displays a 3 dimensional view such that we can examine the decay time with reference to frequency. It is an exceptional tool to reveal transient accuracy and indicate various problem areas with respect to resonance and stored energy. The CSD of the Duo is exceptionally clean with good uniformity.


Ascend Acoustics Duo LCR



Perhaps our most versatile speaker yet, the Duo punches way above its small stature. It is an ideal horizontal center for any of our ribbon speakers. When placed vertically as a main these speakers will fill even a large room when combined with a sub and provide incredibly wide dispersion. Their compact size, stunning good looks, easy wall mounting, and minimal depth make them an ideal on-wall speaker.

The Duo combines extraordinary dynamics, realism, spaciousness, transparency and detail while doing so with such finesse and refinement that there is never a hint of harshness. Although bass is limited, it is impressive for a speaker this size and there are no issues running them full range. Music and home theater simply sound more realistic, providing a more satisfying emotional connection. We must warn you though, once you have heard what these true ribbon tweeters are capable of, there simply is no turning back…


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