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DUO SD Floorstanding Loudspeakers By Avantgarde Acoustic
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Product Summary:
The Avantgarde DUO SD is the epitome of performance and dynamic elegance. Imagine the big brother of the Uno SD... 12" bass drivers instead of 10", as well as a larger cabinet and horn bell. ... Click To Read More
Trial Period 90 Days (Exchange)
Countries Shipped USA
Burn-In Time 300 Hours
Have Questions? 844-462-8346
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DUO SD Floorstanding Loudspeakers By Avantgarde Acoustic


The Avantgarde DUO SD is the epitome of performance and dynamic elegance. Imagine the big brother of the Uno SD… 12″ bass drivers instead of 10″, as well as a larger cabinet and horn bell.



Product Description

In Avantgarde’s G3 Series, Avantgarde has taken the bionic horn principle to the extreme. Highly bred horn performance through unrestrained efficiency with a huge transmission range. The Duo SD is driven by its impressive 670 mm (26.4 in) spherical wave horn with a frequency response that goes down to 170 Hz and the integrated subwoofer takes over all the way down to 18 Hz. Because in the captivating world of spherical wave horns, size is the defining criterion. The larger the dimensions of the horn, the deeper its lower bandwidth and the more the listener enters the maelstrom of superior performance.

The Evolution XM2 midrange driver – a 170 mm chassis with a powerful Alnico magnet – is designed for a large linear diaphragm excursion. Its new “soft mesh compound” diaphragm uses a sturdy mesh carcass as the basis of its construction. The microscopic openings of the mesh are sealed with a damping elastomer coating. The combination of the rigid mesh structure with flexible lining develops a broadband absorption effect that effectively dampens partial vibrations of the diaphragm and thus unwanted effects.

The DUO SD uses the same XT3 tweeter that is used in Avantgarde’s flagship TRIO G3. The XT3’s lighter, annular diaphragm extends the frequency range up to 28,000 Hz at a sensitivity of 107 dB, providing greater clarity, focus, and a fuller, more natural sound.

In the subwoofer, Avantgarde uses the new high-performance XB12 driver in a bass-reflex configuration. Avantgarde has increased the voice coil from 100 mm of the previous model to 153 mm. This gigantic motor structure with a diameter of 6 inches achieves superior values of power factor and power handling. At the same time, thermal compression is significantly reduced.

The G3-500 bass amplifier has 500 watts and is equipped with an advanced digital sound processor. The new user interface allows easy sound adjustment to individual preferences and seamless integration of the system in a wide variety of rooms.

107 dB Efficiency

New Evolution driver generation for extended dynamics and even purer sound.

200 mm – Supertweeter

Innovative XT3 tweeter unit with new Long Throw Horn and extended Supertweeter frequency range with record low distortion values.

670 mm Medium tone spherical wave horn

New improved XM2 DUO Evolution driver with 107dB efficiency and 18 Ohm Omega technology.


Once 12-inch XB12 driver with 153mm voice coil and 1.15 Tesla flux density on 480mm voice coil length. Diaphragm composite of long fiber paper and carbon fiber.

Coplanar driver alignment.

In the G3 Series, all drivers are on one axis. This means that the acoustic centers are all on the same plane. The distance of the acoustic centers of the drivers to the listener is therefore always identical. Accordingly, the signals from the respective sources (tweeter, midrange, and woofer) arrive at the same time and thus correctly.

Modular technology.

All the electronics are housed in easily replaceable technology modules. So that you can easily expand or upgrade your system even after many years.

Current amplifier.

Patented iTRON current fully active engine for perfect control of membrane vibrations and the ultimate sound.


Each shade in the Avantgarde 12-color collection has been carefully selected by us to adorn your horn speakers. The shades are both timelessly elegant and expressive, integrating harmoniously into your interior design and showcasing the horns.

One speaker. Two versions.

The passive version is designed for operation with external HiFi amplifiers. With 107 dB efficiency and 27 ohms impedance, the speaker is extremely easy to operate and ideally suited even for low-power amplifiers. The ideal speaker for the best high-end amplifiers in the world.

In the ITRON version, the amplifiers are built into the speaker and no additional external power amplifiers are needed. For this purpose, Avantgarde has developed integrated electronics based on fundamentally different electro-physical laws than any other amplifier on the market. We have thus succeeded – as the first manufacturer worldwide – in making the technological approach of the current amplifier, which was previously considered technologically unmanageable, work. For a sound that sounds simply heavenly.

Module technology for diversity & timelessness.

Each model has a replaceable technology module that is connected to the speaker via a multi-pin power connector. It is therefore easy to upgrade the passive loudspeaker with ITRON technology or with the wireless module. Even after many years, it is possible to upgrade to the most modern digital technology available at that time. For a convincing sustainability of your investment – for generations to come.

Driver technology

Avantgarde has spent more than five years refining, experimenting, improving, measuring, and listening to the new G3 Evolution driver series. The horn and driver are so perfectly matched and merge in the Evolution series into a coherent unit of superior quality.

Experience & Innovation

For more than 30 years Avantgarde has been exclusively and intensively engaged in horn technology. This has created a wealth of experience in Avantgarde company that is unique and has made many fundamental innovations possible.

Engineering art.

Avantgarde uses only the finest materials. In the development and production, it follows the principles of the highest quality German engineering.


200mm tweeter horn

  • Lower cut-off frequency with substantially increased acoustic power
  • Smaller and lighter membrane
  • Linear phase response less than 50 degrees (4,000 – 20,000 Hz)
  • 28,000 vibrations per second


670mm spherical wave horn

  • Compression ratio tending toward zero
  • Large linear stroke
  • Impedance of 17 Ohm
  • Spheric -Dome diaphragm with AirGate air filter technology
  • 107dB sound pressure

The perfect crossover.

With the Avantgarde SphericLowCut filter, Airgate technology, and PolarizationPlus circuit, Avantgarde has developed the most innovative technological concepts in Avantgarde passive crossover. These are completed, with the highest quality components available. Avantgarde’s new NatureCap is an extremely intricately designed capacitor, handmade in Germany. Instead of using ultra-thin plastic foils vaporized with aluminum, the electrodes are made of precisely rolled aluminum foil. As dielectric Avantgard uses a cellulose fiber compound impregnated by biological oils. The NatureCap is approx. 25 x larger than the capacitors from the XD series and is stably attached to the circuit board via specially manufactured brackets.

XB12 bass driver


For the DUO SD Avantgarde has developed a completely new drive. Compared to the previous model, the voice coil increased from 100mm to 153mm. With this gigantic 6-inch motor structure, it achieves absolute top values for the power factor and power handling, while reducing the power compression.

The motor structure consists of two high-grade magnets magnetized in Europe’s largest 200,000-volt facility. Due to the huge voice coil, the force of the permanent magnet with 1.15 Tesla flux density is transmitted to a voice coil circumference of 480mm. This is an increase of over 50% compared to the previous model!

Avantgarde uses low-carbon steel for the pole plates specially designed for the XB12. To ensure high linearity even at maximum excursion of the diaphragm, the centering has a patented dynamic profile with a progressive design of the surround. The surround is made of low-loss NBR (acrylonitrile butadiene rubber) for a fast and clean transient response. The diaphragm is made of a composite of long-fiber paper and carbon fiber – extremely strong and torsionally stiff for precise pistonic excursion of the diaphragm during transient and decay events.

The XB12’s new SingleFrame chassis has robust die-cast aluminum cantilevers that also enclose the magnet, for a completely stable composite of materials around the moving components of the motor structure. The XB12 is an Avantgarde reference in terms of bass. A statement that underlines the uncompromising and uniqueness of the G3 series.

Bass amplifier


The DUO SD’s active subwoofer is powered by the G3-500 power module. This integrated power amplifier consists of a 500-watt amplifier that provides ample headroom even with complex EQ settings.

The subwoofer can be switched on remotely via a 12-volt switching voltage input. Direct connection to integrated amplifiers, power amplifiers, or receivers is via speaker-level input terminals. Alternatively, line-level inputs are available via XLR terminals. The signal tap is not only high-impedance but also balanced and transformer-coupled. This keeps the circuit ground floating, which avoids hum loops and facilitates connection to balanced and bridged amplifier designs.

All electronics are fused via a state-of-the-art E-Fuse circuit. This is not only much faster and thus safer than conventional fuses but also ideal in terms of sound.

Digital crossover.


The bass power amplifier is equipped with an advanced digital sound processor. With precision and bit accuracy that cannot be achieved with analog technology, the digital crossover eliminates all passive filter elements in the signal path. The subwoofer volume is adjusted via two buttons on the DSP display.

Extensive additional settings (e.g. high and low pass filters, equalizers, etc.) can be programmed with the Avantgarde Control Software. For this purpose, the DSP has 2 x LAN sockets, which allow daisy-chaining and thus programming of several subwoofers simultaneously. A USB connection is optionally available.

The user interface has been completely revised and now allows a very simple intuitive use by the customer. Thus, all parameters can be easily adjusted to the room’s acoustics or listening habits. The BASS-BOOST control can be used to boost the low-frequency response below 45 Hz and thus adjust the bass response from “linear” to “fat”.

For individual frequency adjustments, the DSP has an 8-band equalizer. Each of the 8 x bands can be boosted or cut by up to 4 dB. In this way, the bass response can be adapted to certain sounds (linear, techno, disco, pop, etc.), or some broadband room resonances can be reduced.

The LPF-RANGE slider adjusts the upper crossover frequency of the subwoofer and thus the “tonal balance” of the system. With higher frequency, the subwoofer partially overlaps with the frequency response of the midrange horn. This makes the sound character of voices/instruments “warmer” and “fuller”.

When the crossover frequency is set to a lower frequency, the subwoofer and midrange frequency response have a small gap. The tonal balance of the system shifts towards a more “dynamic & punchy” sound. FILTER 1 & 2 are narrow band “notch” filters with a level cut of -3 dB or -6 dB. These filters can be used to eliminate/reduce unwanted narrowband resonant frequencies in the room.



  • Frequency range satellite: 170-28.000 Hz
  • Frequency range subwoofer: 18-350 Hz
  • Load capacity: 100 Watt
  • Efficiency: (1Watt/1m) > 107 dB
  • Crossover frequencies: 170/3.500 Hz
  • Nominal impedance: 18 Ohm
  • Recommended amplifier power: > 10 Watt
  • Recommended room size: > 20 qm
  • Coplanar driver alignment: Ja
  • OmegaDrive: Ja
  • AirGate: Ja
  • NatureCap incl. PolarizationPlus circuitry: Ja


  • Horn type Spherical: horn
  • Horn opening angle: 180 degree180 Grad
  • Horn diameter midrange: 670 mm
  • Horn diameter tweeter range: 200 mm


  • Diameter midrange: 170 mm / 7 inch
  • Diameter tweeter range: 25 mm / 1 inch


  • Treiber Größe: 300 mm / 12 inch
  • Driver quantity: 1 x XB12
  • Voice coil diameter: 153 mm
  • Flux density: 1.15 Tesla / 480 mm
  • Pole plate: low carbon steel
  • Membrane material: Paper/carbon fiber compound


  • Output power (RMS): 1 x 500 watt
  • Digital crossover: DSP
  • Equalizer: 8 Tape
  • Digital room adjustment: Yes
  • Inputs: 1 x SPKR + 1 x XLR


  • High Performance Multi Contact Connector: Yes
  • Partially active design: Yes
  • Fully active version with ITRON amplifier: Yes


  • ITRON voltage/current converter technology: patent pend.
  • Fully balanced circuit: Yes
  • Single stroke circuit: Yes
  • Zero feedback: Yes
  • Without negative feedback: Yes
  • Power: 2 x 100 watt


  • Dimensions width: 670 mm
  • Dimensions depth: 652 mm
  • Dimensions: (+/- 10 mm) 1.552 mm
  • Weight: 94.0 kg


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